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Carbon dioxide reforming of methane on monolithic Ni/Al_2O_3-based catalysts 认领 引用 被引量：5
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作者 S. O. Soloviev A. Yu. Kapran +1 位作者 S. N. Orlyk E. V. Gubareni 《Journal of Natural Gas Chemistry》 CSCD 2011年第2期184-190,共7页
Nickel-alumina catalysts supported on cordierite monoliths of honeycomb structure surpass essentially the conventional granulated ones with respect to the output in carbon dioxide reforming of methane. Adjusting the s... Nickel-alumina catalysts supported on cordierite monoliths of honeycomb structure surpass essentially the conventional granulated ones with respect to the output in carbon dioxide reforming of methane. Adjusting the surface acid-base properties of catalysts by introduction of alkali metal （Na, K） oxides inhibits the carbonization and as a result, improves the operational stability of these catalysts. An effect of promotion of nickel-alumina based composite doped by lanthanum oxide is found. This effect, caused by an additional route for the CO2 activation on Ni-La2O3/Al2O3/cordierite catalyst, is displayed in increase of methane conversion under conditions of an oxidant excess. 展开更多
关键词 methane carbon dioxide reforming hydrogen syngas Ni/Al2O3 catalysts cordierite monolithic supports honeycomb structure sodium and potassium lanthanum oxide modifying additives
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Effect of Fe_2O_3 Loading Amount on Catalytic Properties of Monolithic Fe_2O_3/Ce0.67Zr0.33O_2-Al_2O_3 Catalyst for Methane Combustion 认领 引用 被引量：4
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作者 刘志敏 陈耀强 +3 位作者 钟俊波 王健礼 闫生辉 龚茂初 《Journal of Rare Earths》 SCIE EI CAS 2007年第5期585-589,共5页
Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal lo... Ce0.67Zr0.33O2-Al2O3 solid solution was prepared by the co-precipitation method. Fe2O3-based catalysts supported on the solid solution were obtained by the impregnation method. The article revealed that the optimal loading amount of Fe2O3 on Ce0.67Zr0.33 O2-Al2O3 in our experimental condition for catalytic combustion of methane was 8% （ mass fraction）. The prepared catalysts were characterized by BET, TPR, XRD analyses, and their catalytic activity was investigated after being calcined at 873 K and after being aged in water gas at 1273 K. When the loading amount of Fe203 was 8% （ mass fraction）, the catalyst held the highest activity, and the best temperature speciality and thermal stability. The complete-conversion temperature of methane for fresh and aged sample was 788 and 838 K, respectively. The range between the light-off temperature and the complete-conversion temperature was only 15 K. The characterization results of XRD indicated that Fe2O3 was well dispersed on the Ce0.67Zr0.33O2-Al2O3 matrix. The results of BET and TPR were in good harmony with the catalytic activity results. 展开更多
关键词 Ce0.67Zr0.33O2 -Al2O3, Fe2O3-based monolithic catalyst catalytic methane combustion catalytic properties
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Monolithic Mesh-Type Fe-Pd/γ-Al2O3/Al Bifunctional Catalysts for Electro-Fenton Degradation of Rhodamine B 认领 引用
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作者 Qianwen Shao Guiru Zhang +1 位作者 Linhui Lu Qi Zhang 《Modern Research in Catalysis》 2021年第2期56-72,共17页
A novel Fe-Pd bifunctional catalyst supported on mesh-type γ-Al2O3/Al was prepared and applied in the degradation of Rhodamine B (RhB). The monolithic mesh-type Fe-Pd/γ-Al2O3/Al bifunctional catalyst could be separa... A novel Fe-Pd bifunctional catalyst supported on mesh-type γ-Al2O3/Al was prepared and applied in the degradation of Rhodamine B (RhB). The monolithic mesh-type Fe-Pd/γ-Al2O3/Al bifunctional catalyst could be separated from the solution directly and could synthesize H2O2 in situ. The characterization results showed that Fe could improve the dispersion of Pd0, and the electronic interactions between Pd and Fe could increase the Pd0 contents on the catalyst, which increased the productivity of H2O2. Furthermore, DFT calculations proved that the addition of Fe could inhibit the dissociation of O2 and promote the nondissociative hydrogenation of O2 on the surface of Fe-Pd/γ-Al2O3/Al, which resulted in the increasement of H2O2 selectivity. Finally, the in-situ synthesized H2O2 by Pd was furtherly decomposed in situ by Fe to generateOH radicals to degrade organic pollutants. Therefore, Fe-Pd/ γ-Al2O3/Al catalysts exhibited excellent catalytic activity in the in-situ synthesis of H2O2 and the degradation of RhB due to the synergistic effects between Pd and Fe on the catalyst. It provided a new idea for the design of bifunctional electro-Fenton catalysts. Ten cycles of experiments showed that the catalytic activity of Fe-Pd/γ-Al2O3/Al catalyst could be maintained for a long time. 展开更多
关键词 Rhodamine B Fe-Pd/γ-Al2O3/Al Catalyst Electro-Fenton Hydrogen Peroxide Synergistic Effects
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Investigation of the characteristics and deactivation of catalytic active center of Cr-Al_2O_3 catalysts for isobutane dehydrogenation 认领 引用 被引量：11
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作者 Deren Fang Jinbo Zhao +4 位作者 Wanjun Li Xu Fang Xin Yang Wanzhong Ren Huimin Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第1期101-107,共7页
Deactivation mechanism of Cr-Al2O3catalyst and the interaction of Cr-A1 in the dehydrogenation of isobutane, as well as the nature of the catalytic active center, were studied using XRD, SEM, XPS, H2-TPR, isobutane-TP... Deactivation mechanism of Cr-Al2O3catalyst and the interaction of Cr-A1 in the dehydrogenation of isobutane, as well as the nature of the catalytic active center, were studied using XRD, SEM, XPS, H2-TPR, isobutane-TPR and TPO techniques. The results revealed that the deactivation of Cr-Al2O3 catalyst was mainly caused by carbon deposition on its surface. The Cr3＋ ion could not be reduced by hydrogen but could be reduced to Cr2＋ by hydrocarbons and monoxide carbon. The active center for isobutane dehydrogenation could be Cr2＋/Cr3＋ produced from Cr6＋ by the on line reduction of hydrocarbon and carbon monoxide. The binding energy of Al3＋ was strongly affected by the state of chromium cations in the catalysts. 展开更多
关键词 isobutane dehydrogenation Cr/Al2O3 deactivation active center catalyst
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Methanation of syngas over coral reef-like Ni/Al_2O_3 catalysts 认领 引用 被引量：27
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作者 Shengli Ma Yisheng Tan Yizhuo Han 《Journal of Natural Gas Chemistry》 CSCD 2011年第4期435-440,共6页
Coral reef-like Ni/Al2O3 catalysts were prepared by co-precipitation of nickel acetate and aluminium nitrate with sodium carbonate aqueous solution in the medium of ethylene glycolye.Methanation of syngas was carried ... Coral reef-like Ni/Al2O3 catalysts were prepared by co-precipitation of nickel acetate and aluminium nitrate with sodium carbonate aqueous solution in the medium of ethylene glycolye.Methanation of syngas was carried out over coral reef-like Ni/Al2O3 catalysts in a continuous flow type fixed-bed reactor.The structure and properties of the fresh and used catalysts were studied by SEM,N2 adsorption-desorption,XRD,H2-TPR,O2-TPO,TG and ICP-AES techniques.The results showed that the coral reef-like Ni/Al2O3 catalysts exhibited better activity than the conventional Ni/Al2O3-H2O catalysts.The activities of coral reef-like catalysts were in the order of Ni/Al2O3-673Ni/Al2O3-573Ni/Al2O3- 473Ni/Al2O3-773.Ni/Al2O3-673-EG catalyst showed not only good activity and improved stability but also superior resistance to carbon deposition,sintering,and Ni loss.Under the reaction conditions of CO/H2（molar ratio）=1：3,593 K,atmospheric pressure and a GHSV of 2500 h-1,CH4 selectivity was 84.7%,and the CO conversion reached 98.2%. 展开更多
关键词 methanation syngas coral reef-like Ni/Al2O3 catalysts calcination
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Effect of Alumina Particle Size on Ni/Al2O3 Catalysts for p-Nitrophenol Hydrogenation 认领 引用 被引量：5
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作者 陈日志 杜艳 +1 位作者 邢卫红 徐南平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2007年第6期884-888,共5页
The catalytic hydrogenation of p-nitrophenol to p-aminophenol was investigated over Ni/Al2O3 catalyst on alumina support with different particle size. It is found that support particle size has significant influences ... The catalytic hydrogenation of p-nitrophenol to p-aminophenol was investigated over Ni/Al2O3 catalyst on alumina support with different particle size. It is found that support particle size has significant influences on physiochemical properties and catalytic activity of the resulting Ni/Al2O3 catalyst, but little influence on the selec-tivity. At a comparable amount of Ni loading, the catalytic activity of Ni/Al2O3 prepared with alumina support of smaller particle size is lower. The reduction behavior of the catalyst is a key factor in determining the catalytic activity of Ni/Al2O3 catalyst. The supported nickel catalyst 10.3Ni/Al2O3-3 improves the life span of the membrane by reducing fouling on the membrane surface compared to nano-sized nickel. 展开更多
关键词 p-nitrophenol catalytic hydrogenation p-aminophenol Ni/Al2O3 catalysts ceramic membrane filtration
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Ethanol steam reforming over Ni-Cu/Al2O3-M_yO_z(M=Si,La,Mg,and Zn)catalysts 认领 引用 被引量：5
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作者 Lifeng Zhang Jie Liu +2 位作者 Wei Li Cuili Guo Jinli Zhang 《Journal of Natural Gas Chemistry》 2009年第1期55-65,共11页
Ni-based catalysts doped with copper additives were studied on their role in ethanol steam reforming reaction.The effects of Cu content,support species involving Al2O3-SIO2,Al2O3-MgO,Al2O3-ZnO,and Al2O3-La2O3,on the c... Ni-based catalysts doped with copper additives were studied on their role in ethanol steam reforming reaction.The effects of Cu content,support species involving Al2O3-SIO2,Al2O3-MgO,Al2O3-ZnO,and Al2O3-La2O3,on the catalytic performance were studied.Characterizations by TPR,XRD,NH3-TPD,XPS,and TGA indicated that catalysts 30Ni5Cu/Al2O3-MgO and 30Ni5Cu/Al2O3-ZnO have much higher H2 selectivity than 30Ni5Cu/Al2O3-SiO2,as well as good coke resistance.H2 selectivity for 30Ni5Cu/Al2O3-MgO catalyst was 73.3%at 450℃and increased to 94.0%at 600℃,whereas for 30Ni5Cu/Al2O3-ZnO catalyst,the H2 selectivity was 63.6%at 450℃and 95.2%at 600℃.TheseAl2O3-MgO and Al2O3-ZnO supported Ni-Cu bimetallic catalysts may have important applications in the production of hydrogen by ethanol steam reforming reactions. 展开更多
关键词 ethanol steam reforming nickel-copper-based catalyst Al2O3-SO2 support Al2O3-MgO support Al2O3-ZnO support Al2O3-La2O3 support
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Characterization and performance of Cu/ZnO/Al_2O_3 catalysts prepared via decomposition of M(Cu,Zn)-ammonia complexes under sub-atmospheric pressure for methanol synthesis from H_2 and CO_2 认领 引用 被引量：8
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作者 Danjun Wang Jun Zhao +1 位作者 Huanling Song Lingjun Chou 《Journal of Natural Gas Chemistry》 CSCD 2011年第6期629-634,共6页
Methanol synthesis from hydrogenation of CO2 is investigated over Cu/ZnO/Al2O3 catalysts prepared by decomposition of M（Cu,Zn）-ammonia complexes （DMAC） at various temperatures.The catalysts were characterized in d... Methanol synthesis from hydrogenation of CO2 is investigated over Cu/ZnO/Al2O3 catalysts prepared by decomposition of M（Cu,Zn）-ammonia complexes （DMAC） at various temperatures.The catalysts were characterized in detail,including X-ray diffraction,N2 adsorption-desorption,N2O chemisorption,temperature-programmed reduction and evolved gas analyses.The influences of DMAC temperature,reaction temperature and specific Cu surface area on catalytic performance are investigated.It is considered that the aurichalcite phase in the precursor plays a key role in improving the physiochemical properties and activities of the final catalysts.The catalyst from rich-aurichalcite precursor exhibits large specific Cu surface area and high space time yield of methanol （212 g/（Lcat·h）;T=513 K,p=3MPa,SV=12000 h-1）. 展开更多
关键词 decomposition of M（Cu,Zn）-ammonia complexes Cu/ZnO/Al2O3 catalyst CO2 hydrogenation methanol synthesis
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Effects of Cerium Oxide on Ni/Al_2O_3 Catalysts for Decomposition of CH_4 and C_2H_4 认领 引用 被引量：5
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作者 杨咏来 李文钊 徐恒泳 《Journal of Rare Earths》 SCIE EI CAS 2003年第4期427-429,共3页
Characteristics of carbon deposition of CH 4 and C 2H 4 decomposition over supported Ni and Ni Ce catalysts were studied by using a pulse reaction as well as BET, TPR, XPS and hydrogen chemisorption techniques. It is ... Characteristics of carbon deposition of CH 4 and C 2H 4 decomposition over supported Ni and Ni Ce catalysts were studied by using a pulse reaction as well as BET, TPR, XPS and hydrogen chemisorption techniques. It is found that there is a metal semiconductor interaction (MScI) in the Ni Ce catalyst, and the effect of MScI on the carbon deposition of CH 4 decomposition is opposite to that of C 2H 4. A novel model of carbon deposition of CH 4 or C 2H 4 decomposition was proposed. 展开更多
关键词 catalytic chemistry Ni/Al 2O 3 catalyst cerium oxide methane ethylene decomposition rare earths
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Effect of Al_2O_3 Binder on the Precipitated Iron-Based Catalysts for Fischer-Tropsch Synthesis 认领 引用 被引量：9
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作者 Hai-Jun Wan Bao-Shan Wu +4 位作者 Xia An Ting-Zhen Li Zhi-Chao Tao Hong-Wei Xiang Yong-Wang Li 《Journal of Natural Gas Chemistry》 2007年第2期130-138,共9页
A series of iron-based Fischer-Tropsch synthesis （FTS） catalysts incorporated with Al2O3 binder were prepared by the combination of co-precipitation and spray drying technology. The catalyst samples were characteriz... A series of iron-based Fischer-Tropsch synthesis （FTS） catalysts incorporated with Al2O3 binder were prepared by the combination of co-precipitation and spray drying technology. The catalyst samples were characterized by using N2 physical adsorption, temperature-programmed reduction/desorption （TPR/TPD） and MSssbauer effect spectroscopy （MES） methods. The characterization results indicated that the BET surface area increases with increasing Al2O3 content and passes through a maximum at the Al2O3/Fe ratio of 10/100 （weight basis）. After the point, it decreases with further increase in Al2O3 content. The incorporation of Al2O3 binder was found to weaken the surface basicity and suppress the reduction and carburization of iron-based catalysts probably due to the strong K-Al2O3 and Fe-Al2O3 interactions. Furthermore, the H2 adsorption ability of the catalysts is enhanced with increasing Al2O3 content. The FTS performances of the catalysts were tested in a slurry-phase continuously stirred tank reactor （CSTR） under the reaction conditions of 260 ℃, 1.5 MPa, 1000 h^-1 and molar ratio of H2/CO 0.67 for 200 h. The results showed that the addition of small amounts of Al2O3 affects the activity of iron-based catalysts to a little extent. However, with further increase of Al2O3 content, the FTS activity and water gas shift reaction （WGS） activity are decreased severely. The addition of appropriate Al2O3 do not affect the product selectivity, but the catalysts incorporated with large amounts of Al2O3 have higher selectivity for light hydrocarbons and lower selectivity for heavy hydrocarbons. 展开更多
关键词 Fischer-Tropsch synthesis iron-based catalyst Al2O3 binder Fe-Al2O3 interaction
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Selective Hydrogenation of Butyne-1,4-diol to Butane-1,4-diol over Ni/Al_2O_3-SiO_2 Catalysts 认领 引用 被引量：2
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作者 Fang Jie Zhuang Changjian +2 位作者 Meng Jipeng Cheng Lang Lu Jiangyin 《China Petroleum Processing & Petrochemical Technology》 CAS 2018年第4期20-28,共9页
Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by... Ni/Al_2O_3-SiO_2 catalysts were synthesized via one-step method employing SiO_2 as an additive for the selective hydrogenation of butyne-1,4-diol(B_3D) to butane-1,4-diol(B1D). The prepared catalysts were evaluated by a series of characterization techniques including BET, XRD, SEM, EDX-mapping, TEM, H_2-TPR, XPS, NH_3-TPD and Py-FTIR. Compared to Ni/Al_2O_3 catalyst, the SiO_2-doped samples exhibited better B_3D conversion. SiO_2 could help to form a strong interaction between NiO with the support, which inhibited Ni agglomeration at high temperature, improved the Ni dispersion, and enhanced the hydrogenation activity. B_1D selectivity was mainly influenced by the quantity of Lewis acid sites in addition to the Ni dispersion. The catalyst with a silica loading of 6.4% demonstrated an excellent selectivity of 75.18%(by 13% higher than the contrastive Ni/Al_2O_3 catalyst), which was attributed to the larger amount of Lewis acid sites and the moderate interaction between NiO with the support, which could facilitate the nickel dispersion on a preferable surface area of 176.3 m^2/g of support. 展开更多
关键词 Ni/Al2O3-SiO2 catalysts butyne-1,4-diol butane-1,4-diol hydrogenation
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CO_2 methanation over TiO_2–Al_2O_3 binary oxides supported Ru catalysts 认领 引用 被引量：3
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作者 Jinghua Xu Qingquan Lin +3 位作者 Xiong Su Hongmin Duan Haoran Geng Yanqiang Huang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第1期140-145,共6页
TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO_2–Al_2O_3catalyst in CO_2 methanation reaction was inv... TiO_2 modified Al_2O_3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO_2–Al_2O_3catalyst in CO_2 methanation reaction was investigated. Compared with Ru/Al_2O_3 catalyst, the Ru/TiO_2–Al_2O_3catalytic system exhibited a much higher activity in CO_2 methanation reaction. The reaction rate over Ru/TiO_2–Al_2O_3 was 0.59 mol CO_2·(g Ru)1·h-1, 3.1 times higher than that on Ru/Al_2O_3[0.19 mol CO_2·(gRu)-1·h-1]. The effect of TiO_2 content and TiO_2–Al_2O_3calcination temperature on catalytic performance was addressed. The corresponding structures of each catalyst were characterized by means of H_2-TPR, XRD, and TEM. Results indicated that the averaged particle size of the Ru on TiO_2–Al_2O_3support is 2.8 nm, smaller than that on Al_2O_3 support of 4.3 nm. Therefore, we conclude that the improved activity over Ru/TiO_2–Al_2O_3catalyst is originated from the smaller particle size of ruthenium resulting from a strong interaction between Ru and the rutile-TiO_2 support, which hindered the aggregation of Ru nanoparticles. 展开更多
关键词 CO2 methanation Supported Ru catalyst TiO2–Al2O3 binary oxide
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Oxidative desulfurization of dibenzothiophene over Fe promoted Co–Mo/Al_2O_3 and Ni–Mo/Al_2O_3 catalysts using hydrogen peroxide and formic acid as oxidants 认领 引用 被引量：4
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作者 Yaseen Muhammad Ayesha Shoukat +2 位作者 Ata Ur Rahman Haroon Ur Rashid Waqas Ahmad 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第3期593-600,共8页
This work reports the enhancing effect of a highly cost effective and efficient metal, Fe, incorporation to Co or Ni based Mo/Al2O3 catalysts in the oxidative desulfurization （ODS） of dibenzothiophene （DBT） using ... This work reports the enhancing effect of a highly cost effective and efficient metal, Fe, incorporation to Co or Ni based Mo/Al2O3 catalysts in the oxidative desulfurization （ODS） of dibenzothiophene （DBT） using H2O2 and formic acid as oxidants. The influence of operating parameters i.e. reaction time, catalyst dose, reaction temperature and oxidant amount on oxidation process was investigated. Results revealed that 99% DBT conversion was achieved at 60℃ and 150 min reaction time over Fe-Ni-Mo/Al2O3. Fe tremendously enhanced the ODS activity of Co or Ni based Mo/Al2O3 catalysts following the activity order：Fe-Ni-Mo/Al2O3 〉 Fe-Co-Mo/Al2O3 〉 Ni-Mo/Al2O3 〉 Co-Mo/Al2O3, while H2O2 exhibited higher oxidation activity than formic acid over all catalyst systems. Insight about the surface morphology and textural properties of fresh and spent catalysts were achieved using scanning electron microscopy （SEM）, X-ray diffraction （XRD）, energy dispersive X-ray （EDX） analysis, Atomic Absorption Spectroscopy （AAS） and BET surface area analysis, which helped in the interpretation of experimental data. The present study can be deemed as an effective approach on industrial level for ODS of fuel oils crediting to its high efficiency, low process/catalyst cost, safety and mild operating condition. 展开更多
关键词 Oxidative desulfurization Fuel oil Dibenzothiophene Fe promoted （Co/Ni）-Mo/Al2O3 catalyst XRD
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Probing into Surface Sites of Fresh Mo_2N/Al_2O_3,Mo_2C/Al_2O_3 and MoP/Al_2O_3 Catalysts by CO Adsorption and In Situ FT-IR Spectroscopy 认领 引用 被引量：1
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作者 Zhang Jing Wu Weicheng +1 位作者 Yan Song Zhang Dan 《China Petroleum Processing & Petrochemical Technology》 CAS 2010年第4期43-45,共3页
The surface nature of fresh Mo2N/Al2O3, Mo2C/Al2O3 and/MoP/Al2O3 catalysts, which were synthesized directly in the IR cell to avoid passivation, were characterized by in situ IR spectroscopy with CO as a probe molecul... The surface nature of fresh Mo2N/Al2O3, Mo2C/Al2O3 and/MoP/Al2O3 catalysts, which were synthesized directly in the IR cell to avoid passivation, were characterized by in situ IR spectroscopy with CO as a probe molecule. CO adsorbed on fresh catalysts showed characteristic IR bands at 2045 cm-1 for Mo2N/Al2O3 catalyst, 2054 cm-1 for MozC/Al2O3 catalyst and 2037 cm-1 for MoP/Al2O3 catalyst, respectively. A strong band at 2200 cm-1 for Mo2N/Al2O3 catalyst, which could be ascribed to NCO species formed when CO reacted upon surface active nitrogen atoms, and a weak band at 2196 cm-1 for Mo2C/Al2O3 catalyst, which could be attributed to CCO species, were also detected. CO adsorbed on fresh Mo2N/Al2O3 catalyst, Mo2C/Al2O3 catalyst and MoP/Al2O3 catalyst, showed strong molecular adsorption, just like noble metals. Our experimental results are bolstered by direct IR evidence demonstrating the similarity in surface electronic property between the fresh Mo2N/Al2O3, Mo2C/Al2O3 and MoP/Al2O3 catalysts and noble metals. 展开更多
关键词 Mo2C/Al2O3 catalyst Mo2N/Al2O3 catalyst Mo2P/Al2O3 catalyst FT-IR CO
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Enhanced CO oxidation over potassium-promoted Pt/Al_2O_3 catalysts:Kinetic and infrared spectroscopic study 认领 引用 被引量：1
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作者 刘欢欢 贾爱平 +2 位作者 王瑜 罗孟飞 鲁继青 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2015年第11期1976-1986,共11页
A series of K-promoted Pt/Al2O3 catalysts were tested for CO oxidation. It was found that the addition of K significantly enhanced the activity. A detailed kinetic study showed that the activation energies of the K-co... A series of K-promoted Pt/Al2O3 catalysts were tested for CO oxidation. It was found that the addition of K significantly enhanced the activity. A detailed kinetic study showed that the activation energies of the K-containing catalysts were lower than those of the K-free ones, particularly for catalysts with high Pt contents （51.6 k）/mol for 0.42K-2.0Pt/Al2O3 and 6：3.6 kJ/mol for 2.0Pt/Al2O3 ）. The CO reaction orders were higher for the K-containing catalysts （about -0.2） than for the K-free ones （about -0.5）, with the former having much lower equilibrium constants for CO adsorption than the latter. In situ Fourier-transform infrared spectroscopy showed that surface CO desorption from the 0.42K-2.0Pt/Al2O3 catalyst was easier than from 2.0Pt/Al2O3. The promoting effect of K was therefore caused by weakening of the interactions between CO and surface Pt atoms. This decreased coverage of the catalyst with CO and facilitated competitive O2 chemisorption on the Pt surface, and significantly lowered the reaction barrier between chemisorbed CO and O2 species. 展开更多
关键词 CO oxidation Potassium Kinetics Pt/Al2O3 catalyst Promoting effect
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Relationship between Cr-Al Interaction and the Performance of Cr-Al2O3 Catalysts for Isobutane Dehydrogenation 认领 引用 被引量：1
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作者 Deren Fang Jinbo Zhao +3 位作者 Shang Liu Limei Zhang Wanzhong Ren Huimin Zhang 《Modern Research in Catalysis》 2015年第2期50-58,共9页
A series of catalysts were prepared using the kneading molding method and the impregnation method as well as the dry mix method by using different raw materials. By using X-ray diffraction (XRD), X-ray photoelectron s... A series of catalysts were prepared using the kneading molding method and the impregnation method as well as the dry mix method by using different raw materials. By using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction (TPR) techniques, we studied the relationship between the catalyst performance and the Cr-Al interaction in the catalytic dehydrogenation of isobutane. The results demonstrated that the Cr-Al interaction in the catalyst had a direct influence on the catalytic activity and the selectivity of isobutene. The catalysts prepared using the kneading molding method had higher catalytic activity and isobutene selectivity than those prepared using the dry mix method. By comparison, XRD, XPS, and TPR results showed that the greater the Cr-Al interaction in the catalyst was, the higher the catalytic activity was. Here, we propose a mechanism of isobutane dehydrogenation. 展开更多
关键词 Isobutane Dehydrogenation Cr/Al2O3 Cr-Al Interaction Catalyst Mechanism
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Preparation of Cu/ZnO/Al_2O_3 catalysts in a solvent-free routine for CO hydrogenation 认领 引用
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作者 Hong LEI Ren-feng NIE +1 位作者 Jin-hua FEI Zhao-yin HOU 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2012年第5期395-406,共12页
The synthesis of methanol and dimethyl ether(DME) from CO hydrogenation has been investigated on Cu-based catalysts.A series of Cu/ZnO/Al2O3 catalysts were prepared using a solvent-free routine which involved a direct... The synthesis of methanol and dimethyl ether(DME) from CO hydrogenation has been investigated on Cu-based catalysts.A series of Cu/ZnO/Al2O3 catalysts were prepared using a solvent-free routine which involved a direct blend of copper/zinc/aluminum salts and citric acid,followed by calcination at 450 °C.The calcination processes were monitored using thermogravimetry differential scanning calorimetry(TG-DSC).Catalysts were further characterized using N2 adsorption,scanning electronic microscopy(SEM),X-ray diffraction(XRD),N2O oxidation followed by H2 titration,and temperature-programmed reduction with H2(H2-TPR).The reduction processes were also monitored with in-situ XRD.The physicochemical properties of catalysts depended strongly on the types of precursor salts,and catalysts prepared using Al acetate and Cu nitrate as starting materials had a larger surface area,larger exposed metallic copper surface area,and lower reduction temperature.The CO hydrogenation performances of these catalysts were compared and discussed in terms of their structures.Catalysts prepared with copper nitrate,zinc and aluminum acetates exhibited the highest catalytic activity. 展开更多
关键词 Cu/ZnO/Al2O3 catalyst Solvent-free routine CO hydrogenation Methanol Dimethyl ether
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Study on Au/Al_2O_3 catalysts for low-temperature CO oxidation in situ FT-IR 认领 引用
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作者 Xuhua Zou Shixue Qi +3 位作者 Jinguang Xu Zhanghuai Suo Lidun An Feng Li 《Journal of Natural Gas Chemistry》 2010年第3期307-312,共6页
Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were exa... Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were examined after separate treatment in CO＋O2 or CO2 ＋O2 .Furthermore,in situ FT-IR studies were performed to investigate the species on the surface when CO or CO＋O2 or CO2 ＋O2 was selected separately as adsorption gas.The results showed that Au/Al2O3 catalyst exhibited very high initial activity,but the catalytic activity was found to decrease gradually during CO oxidation with time on stream.And also,the activity of the catalyst declined after treatment in CO＋O2 or CO2 ＋O2 .The formation and accumulation of carbonate-like species during CO oxidation or treatment in CO＋O2 or CO2 ＋O2 might be mainly responsible for the activity decrease,which was reversible. 展开更多
关键词 supported gold catalyst Au/Al2O3 CO oxidation catalytic activity stability in situ FT-IR
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Preparation of Fe_2P/Al_2O_3 and FeP/Al_2O_3 catalysts for the hydrotreating reactions 认领 引用 被引量：3
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作者 Yamei Yuan Jiayou Zhang +2 位作者 Hui Chen Qiumei Hou Jianyi Shen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第2期116-121,共6页
A 60%Fe/Al_2O_3 catalyst was prepared by the co-precipitation method.It was reduced by H_2 to produce metallic Fe,which was then sulfided by CS_2 to Fe0.96 S and Fe_3S_4 or phosphided by triphenylphosphine(PPh3) in... A 60%Fe/Al_2O_3 catalyst was prepared by the co-precipitation method.It was reduced by H_2 to produce metallic Fe,which was then sulfided by CS_2 to Fe0.96 S and Fe_3S_4 or phosphided by triphenylphosphine(PPh3) in liquid phases to Fe2 P and Fe P.It was found that the iron sulfides(Fe0.96 S and Fe_3S_4) exhibited the low activity for the hydrodesulfurization(HDS) reactions.The HDS activity was also low on the Fe(metal)/Al_2O_3 and Fe_2 P/Al_2O_3 catalysts since they were converted into Fe0.96 S and Fe_3S_4 during the HDS reactions.In contrast,the FeP/Al_2O_3 was found to be stable and active for the HDS reactions.In particular,Fe P/Al_2O_3 possessed significantly smaller Fe P particles than Fe P/C,leading to the significant higher HDS activity of FeP/Al_2O_3 than Fe P/C. 展开更多
关键词 Fe2P/Al2O3 catalyst FeP/Al2O3 catalyst Liquid phase phosphidation PPh3 Hydrotreating reactions
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Effect of H_2S Concentration on MoO3/Al2O3and CoO-MoO3/Al2O3Catalysts for Sulfur-Resistant Methanation 认领 引用 被引量：3
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作者 WANG Bao-Wei LIU Si-Han +2 位作者 HU Zong-Yuan LI Zhen-Hua MA Xin-Bin 《物理化学学报》 SCIE CAS CSCD 北大核心 2015年第3期545-551,共7页
The activities of 25%(mass fraction,w)Mo O3/Al2O3 and 5%(w)Co O-25%Mo O3/Al2O3 catalysts in a sulfur-resistant methanation process were examined as the concentration of H2 S was varied from 0 to 12 m L·L^-1(volum... The activities of 25%(mass fraction,w)Mo O3/Al2O3 and 5%(w)Co O-25%Mo O3/Al2O3 catalysts in a sulfur-resistant methanation process were examined as the concentration of H2 S was varied from 0 to 12 m L·L^-1(volume fractionφ=0.00%-1.20%).The results showed that the catalytic activity of 5%Co O-25%Mo O3/Al2O3 catalyst increased steadily as the concentration of H2 S increased.However,the catalytic performance of the25%Mo O3/Al2O3 catalyst was insensitive to the H2 S concentration.Co was found to benefit the 25%Mo O3/Al2O3 catalyst when H2 S concentration was greater than 0.40%(φ).Below this threshold,addition of Co to the catalyst matrix inhibited the activity of the 25%Mo O3/Al2O3 catalyst.N2-physisorption(BET)and X-ray diffraction(XRD)analyses were used to characterize the fresh and used catalysts.The results indicated that exposure to H2 S at various concentrations did not significantly affect the physical structure of the catalysts,but it will affect the active phase through metal sulfides.The results provide the appropriate range of H2 S concentration to add Co as promoter for 25%Mo O3/Al2O3 catalyst,which is likely to be useful for industrial catalyst selection. 展开更多
关键词 Sulfur-resistant methanation H2S concentration Mo O3/Al2O3catalyst Co promoter Synthetic natural gas
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