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Photoluminescence behavior and visible light photocatalytic activity of ZnO,ZnO/ZnS and ZnO/ZnS/α-Fe_2O_3 nanocomposites 认领 引用 被引量：7
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作者 Gaurav HITKARI Sandhya SINGH Gajanan PANDEY 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第7期1387-1397,共11页
In order to achieve effective, economic, and easily achievable photocatalyst for the degradation of dye methyl orange（MeO）, ZnO, ZnO/ZnS and ZnO/ZnS/α-Fe2O3 nanocomposites were prepared by simple chemical synthetic... In order to achieve effective, economic, and easily achievable photocatalyst for the degradation of dye methyl orange（MeO）, ZnO, ZnO/ZnS and ZnO/ZnS/α-Fe2O3 nanocomposites were prepared by simple chemical synthetic route in the aqueous medium. Phase, crystallinity, surface structure and surface behavior of the synthesized materials were determined by X-ray diffraction（XRD） and Brunauer-Emmett-Teller analysis（BET） techniques. XRD study established formation of good crystalline ZnO, ZnO/ZnS and ZnO/ZnS/α-Fe2O3 nanomaterials. By using intensity of constituent peaks in the XRD pattern, the compositions of nanocomposites were determined. From the BET analysis, the prepared materials show mesoporous behavior, type Ⅳ curves along with H4 hysteresis. The ZnO/ZnS/α-Fe2O3 composite shows the largest surface area among three materials. From the UV-visible spectra, the band gap energy of the materials was determined. Photoluminescence spectra（PL） were used to determine the emission behavior and surface defects in the materials. In PL spectra, the intensity of UV peak of ZnO/ZnS is lowered than that of ZnO while in case of ZnO/ZnS/α-Fe2O3, the intensity further decreased. The visible emission spectra of ZnO/ZnS increased compared with ZnO while in ZnO/ZnS/α-Fe2O3 it is further increased compared with ZnO/ZnS. The as-synthesized materials were used as photocatalysts for the degradation of dye MeO. The photo-degradation data revealed that the ZnO/ZnS/α-Fe2O3 is the best photocatalyst among three specimens for the degradation of dye MeO. The decrease of intensity of UV emission peak and the increase of intensity of visible emission cause the decrease of recombination of electrons and holes which are ultimately responsible for the highest photocatalytic activity of ZnO/ZnS/α-Fe2O3. 展开更多
关键词 nanocomposite ZnO ZnS α-Fe2O3 calcination optical properties photocatalytic activity
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CeO_2-CuO/ZnO/Al_2O_3用于1,5-戊二醇气相催化脱氢制备δ-环戊内酯的研究 认领 引用 被引量：2
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作者 冯世宏 闫广学 +2 位作者 宋国全 吴红梅 郭宇 《现代化工》 CAS CSCD 北大核心 2017年第12期106-109,共4页
采用溶胶-凝胶法制备了CeO_2-CuO/ZnO/Al_2O_3,通过XRD检测了CeO_2-CuO/ZnO/Al_2O_3,揭示了CeO_2-CuO/ZnO/Al_2O_3微观结构和内在规律。结果发现,金属离子之间存在协同效应,以1,5-戊二醇气相催化脱氢制备δ-环戊内酯为探针反应,评价其... 采用溶胶-凝胶法制备了CeO_2-CuO/ZnO/Al_2O_3,通过XRD检测了CeO_2-CuO/ZnO/Al_2O_3,揭示了CeO_2-CuO/ZnO/Al_2O_3微观结构和内在规律。结果发现,金属离子之间存在协同效应,以1,5-戊二醇气相催化脱氢制备δ-环戊内酯为探针反应,评价其催化活性,3%CeO_2的CuO/ZnO/Al_2O_3呈现出最高催化活性。催化反应的最佳反应条件:反应温度为563 K,气时空速为5 h-1,反应时间为5 h,V(氢气)∶V(1,5-戊二醇)=2.0∶1,p(H2)=0.12 MPa,此时,1,5-戊二醇的转化率为93.0%,δ-环戊内酯的选择性和收率最大值分别达到94.0%、87.4%。该方法为1,5-戊二醇气相催化脱氢制备δ-环戊内酯的中试和工业放大性研究提供了基础数据和实验依据。 展开更多
关键词 CuO/ZnO/Al2O3 1 5-戊二醇 δ-环戊内酯 催化脱氢
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柠檬酸溶胶凝胶法合成CeO2/ZnO/Al2O3纳米紫外屏蔽材料 认领 引用 被引量：2
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作者 冯恩临 吴限 +2 位作者 张宇佳 孙博 李丽华 《应用化工》 CAS CSCD 北大核心 2020年第4期877-880,共4页
以六水合硝酸铈、六水合硝酸锌以及九水合硝酸铝为原料,采用柠檬酸溶胶凝胶法制备了纳米CeO2/ZnO/Al2O3紫外屏蔽材料。采用X射线衍射(XRD)、扫描电镜(SEM)、傅里叶红外光谱仪(FTIR)和紫外可见分光光度计(UV-Vis)等测试手段对样品进行了... 以六水合硝酸铈、六水合硝酸锌以及九水合硝酸铝为原料,采用柠檬酸溶胶凝胶法制备了纳米CeO2/ZnO/Al2O3紫外屏蔽材料。采用X射线衍射(XRD)、扫描电镜(SEM)、傅里叶红外光谱仪(FTIR)和紫外可见分光光度计(UV-Vis)等测试手段对样品进行了表征。结果表明,样品为30~50 nm纳米团状颗粒,并在UVA紫外区域比与同等条件下合成的CeO2/ZnO更好的吸收。CeO 2/ZnO/Al2O3样品在紫外光照射下90min RhB溶液脱色率仅为23%,具有优良的紫外屏蔽性能,且与CeO2/ZnO相比没有光催化性。 展开更多
关键词 纳米CeO2/ZnO/Al2O3 柠檬酸溶胶凝胶法 紫外屏蔽
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Research of Trap and Electron Density Distributions in the Interface of Polyimide/Al2O3 Nanocomposite Films Based on IDC and SAXS 认领 引用 被引量：1
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作者 Yuan-Yuan Liu Jing-Hua Yin +4 位作者 Xiao-Xu Liu Duo Sun Ming-Hua Chen Zhong-Hua Wu Bo Su 《Chinese Physics Letters》 SCIE EI CAS CSCD 2017年第4期116-119,共4页
The distributions of traps and electron density in the interfaces between polyimide （PI） matrix and Al2O3 nanoparticles are researched using the isothermal decay current and the small-angle x-ray scattering （SAXS）... The distributions of traps and electron density in the interfaces between polyimide （PI） matrix and Al2O3 nanoparticles are researched using the isothermal decay current and the small-angle x-ray scattering （SAXS） tests. According to the electron density distribution for quasi two-phase mixture doped by spherical nanoparticles, the electron densities in the interfaces of PI/Al2O3 nanocomposite films are evaluated. The trap level density and carrier mobility in the interface are studied. The experimental results show that the distribution and the change rate of the electron density in the three layers of interface are different, indicating different trap distributions in the interface layers. There is a maximum trap level density in the second layer, where the maximum trap level density for the nanocomposite film doped by 25 wt% is 1.054 × 10^22 eV·m^-3 at 1.324eV, resulting in the carrier mobility reducing. In addition, both the thickness and the electron density of the nanocomposite film interface increase with the addition of the doped Al2O3 contents. Through the study on the trap level distribution in the interface, it is possible to further analyze the insulation mechanism and to improve the performance of nano-dielectric materials. 展开更多
关键词 AI PI Research of Trap and Electron Density Distributions in the Interface of Polyimide/Al2O3 Nanocomposite Films Based on IDC and SAXS IDC Al
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CeO_2-CuO/ZnO/Al_2O_3催化合成二乙基甲苯二胺及性质 认领 引用 被引量：2
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作者 贾太轩 丁炳伟 +3 位作者 冯世宏 张震斌 吴红梅 郭宇 《化学世界》 CAS CSCD 2018年第6期365-370,共6页
采用柠檬酸为络合剂,溶胶-凝胶法制备系列CeO_2-CuO/ZnO/Al_2O_3,在3.0 MPa压力和220~230℃反应条件下,甲苯二胺(TDA)和乙烯催化合成二乙基甲苯二胺(DETDA)为探针反应,考察其催化性能,其中CeO_2掺杂量为3%,催化活性最高。通过X射线衍射(... 采用柠檬酸为络合剂,溶胶-凝胶法制备系列CeO_2-CuO/ZnO/Al_2O_3,在3.0 MPa压力和220~230℃反应条件下,甲苯二胺(TDA)和乙烯催化合成二乙基甲苯二胺(DETDA)为探针反应,考察其催化性能,其中CeO_2掺杂量为3%,催化活性最高。通过X射线衍射(XRD)、傅里叶红外光谱(FT-IR)、差热重量分析法(DTG-DTA)、核磁氢谱1 H NMR对CeO_2-CuO/ZnO/Al_2O_3、DETDA、TDA进行检测和表征,揭示了它们的微观结构和内在规律性。XRD检测发现CeO_2掺杂量增多,CeO_2-CuO/ZnO/Al_2O_3衍射峰强度增强,提高了晶化程度,金属原子存在协同效应,增多了活性中心。FT-IR揭示了DETDA内部化学键键型,拥有甲基、亚甲基的多取代芳胺。DTG-DTA检测出的质量变化与热效应两种信息,DETDA的DTG-DTA曲线在66.0、271.0℃存在二个吸热峰,分别为氨基脱离苯环、DETDA的分解产生。通过1 H NMR对DETDA、TDA检测,得到DETDA、TDA的氢原子的数目分别为18和10,分子中各个氢核对应所归属的吸收峰,分别和它们分子式中的氢原子数目吻合。CeO_2-CuO/ZnO/Al_2O_3催化合成DETDA,反应条件温和,工艺流程简单,容易实现高效率和连续化工业生产,因此具有广阔的发展前景。 展开更多
关键词 二乙基甲苯二胺 CeO2-CuO/ZnO/A12O3 X射线衍射 傅里叶红外光谱 差热重量分析法 1^H NMR
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Effect of Mg addition on mechanical and thermoelectrical properties of Al-Al_2O_3 nanocomposite 认领 引用 被引量：2
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作者 A.WAGIH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第11期2810-2817,共8页
The effects of Mg addition on mechanical thermo-electrical properties of Al.Mg/5%Al2O3 nanocomposite with differentMg contents （0, 5%, 10% and 20%） produced by mechanical alloying were studied. Scanning electron mic... The effects of Mg addition on mechanical thermo-electrical properties of Al.Mg/5%Al2O3 nanocomposite with differentMg contents （0, 5%, 10% and 20%） produced by mechanical alloying were studied. Scanning electron microscopy analysis （SEM）,X-ray diffraction analysis （XRD） and transmission electron microscopy （TEM） were used to characterize the produced powder. Theresults show that addition of Mg forms a predominant phase （Al.Mg solid solution）. By increasing the mass fraction of Mg, thecrystallite size decreases and the lattice strain increases which results from the atomic penetration of Mg atoms into the substitutionalsites of Al lattice. The microhardness of the composite increases with the increase of the Mg content. The thermal and electricalconductivities increase linearly with the temperature increase in the inspected temperature range. Moreover, the thermalconductivity increases with the increase of Mg content. 展开更多
关键词 Al.Al2O3 nanocomposite Mg mechanical alloying microhardness thermoelectrical properties
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Structure and Magnetic Properties of FeCo/Al_2O_3 Nanocomposites 认领 引用
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作者 LI Hai-bo XU Shi-chong +2 位作者 LIU Mei FENG Ming YIN Ji-zhe 《Chemical Research in Chinese Universities》 SCIE CAS 2010年第3期344-347,共4页
The soft magnetic nanocomposites with equiatomic FeCo particles dispersed in Al2O3 matrix were synthesized via a sol-gel technique combined with H2 reduction method. The samples were characterized by X-ray diffraction... The soft magnetic nanocomposites with equiatomic FeCo particles dispersed in Al2O3 matrix were synthesized via a sol-gel technique combined with H2 reduction method. The samples were characterized by X-ray diffraction, transmission electron microscopy and vibrating sample magnetometer. The FeCo nanoparticles in all the samples have the typical bcc structure. With the decreasing of Al2O3 content, the mean grain size of FeCo in the nanocomposites and the saturation magnetization of the samples increase, while the coercivity of samples increases firstly and then decreases due to different magnetic mechanisms. 展开更多
关键词 FeCo/Al2O3 Nanocomposite Structure Magnetic property
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Preparation and characterization of (CeO2)x-(Fe2O3)1-x nanocomposites:reduction kinetics and hydrogen storage 认领 引用 被引量：3
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作者 Shimaa G.Sayed Waleed M.A.El Rouby Ahmed A.Farghali 《Rare Metals》 SCIE EI CAS CSCD 2020年第3期218-229,共12页
A series of nanosized CeO2-Fe2O3 mixed-oxide nanocomposites with different Ce4+/Fe3+molar ratios were successfully prepared by a co-precipitation technique.The surface area increased with Fe2O3 content increasing up t... A series of nanosized CeO2-Fe2O3 mixed-oxide nanocomposites with different Ce4+/Fe3+molar ratios were successfully prepared by a co-precipitation technique.The surface area increased with Fe2O3 content increasing up to 60 wt%in the composite.However,with further increase in Fe2O3 content,the surface area began to decrease.The reduction processes of the CeO2-Fe2O3 nanocomposites were studied in a hydrogen atmosphere at 300-600℃.The reduction rates increased by increasing both the temperature and Fe2O3 content in the nanocomposites.The microstructure of the reduced composites at 500℃illustrated the presence of a considerable number of macro-and micro-pores.The activation energy values were calculated which were in the range of 3.56-5.37 kJ mol-1 at the initial stages(up to 35%reduction)and 5.21-10.2 kJ·mol-1 at the final stages(up to 80%reduction)of reduction.The rate-controlling mechanisms in both the initial and final reduction stages were determined,and the initial reaction stage was controlled by combined gaseous diffusion and interfacial chemical reaction mechanisms for all the composites except for pure CeO2,which was controlled by a chemical reaction mechanism.The final reaction stage was controlled by a gaseous diffusion mechanism for some composites,while for the others it was controlled by combined gaseous diffusion and interfacial chemical reaction mechanisms.The hydrogen sorption properties of the nanocomposites were studied by pressure composition isotherms using a volumetric method.Hydrogen storage in the nanocomposites increased by increasing the temperature because of the formation of oxygen vacancies which enhance atomic H adsorption and function as strong adsorption sites forming more metal hydride covalent bonds. 展开更多
关键词 CeO2-Fe2O3 nanocomposite Reduction kinetics Reduction mechanism Hydrogen storage Oxygen vacancies
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Formation mechanism of Al2O3/MoS2 nanocomposite coating by plasma electrolytic oxidation(PEO) 认领 引用 被引量：1
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作者 Babak GHORBANIAN Mohammad TAJALLY +1 位作者 Seyed Mohammad MOUSAVI KHOIE Hossein TAVAKOLI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2020年第6期144-155,共12页
In this study,an Al2O3/MoS2 nanocomposite coating was created on an aluminum 1050 substrate using the plasma electrolytic oxidation method.The zeta potential measurements showed that small MoS2 particles have negative... In this study,an Al2O3/MoS2 nanocomposite coating was created on an aluminum 1050 substrate using the plasma electrolytic oxidation method.The zeta potential measurements showed that small MoS2 particles have negative potential and move toward the anode electrode.The nanoparticles of MoS2 were found to have a zeta potential of-25 mV,which prevents suspension in the solution.Thus,to produce an Al2O3/MoS2 nanocomposite,one has to use the microparticles of MoS2.The X-ray diffraction analyses showed that the produced coatings containedα-Al2O3,γ-Al2O3,and MoS2,and that the size of MoS2 particles can be reduced to 30 nm.It was observed that prolonged suspension in the electrolyte results in an enhanced formation of an Al2O3/MoS2 nanocomposite.Using the results,it was hypothesized that the mechanism of the formation of the Al2O3/MoS2 nanocomposite coating on the aluminum 1050 substrate is based on electrical energy discharge. 展开更多
关键词 plasma electrolytic oxidation corrosion Al2O3/MoS2 nanocomposite tribology
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CeO_2改性MnO_x/Al_2O_3的低温SCR法脱硝性能及机制研究 认领 引用 被引量：36
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作者 郭静 李彩亭 +3 位作者 路培 崔华飞 彭敦亮 文青波 《环境科学》 CAS CSCD 北大核心 2011年第8期2240-2246,共7页
采用凝胶溶胶法制备大比表面积的Al2O3载体,等体积浸渍法配制负载MnOx和CeO2组分的CeO2-MnOx催化剂.以NH3为还原剂,一定的空气流速及合适的气体配比的条件下,考察所制备的催化剂在70～300℃范围内低温SCR法的脱硝性能及机制,同时分别对... 采用凝胶溶胶法制备大比表面积的Al2O3载体,等体积浸渍法配制负载MnOx和CeO2组分的CeO2-MnOx催化剂.以NH3为还原剂,一定的空气流速及合适的气体配比的条件下,考察所制备的催化剂在70～300℃范围内低温SCR法的脱硝性能及机制,同时分别对催化剂进行BET、XRD、SEM等表征实验,研究催化剂的理化性质.结果表明,活性组分的负载量和焙烧温度对催化剂性能有很大的影响,适量CeO2的加入提高催化剂的活性及稳定性.在负载不同质量分数的MnOx/Al2O3催化剂中,7%MnOx/Al2O3显示了最大催化活性;添加CeO2可极大的改善MnOx/Al2O3中MnOx在载体表面的分散度,并提高其催化活性,4%的CeO2是MnOx/Al2O3最佳的添加量.实验结果还表明550℃为催化剂最佳的焙烧温度,这与MnOx形成不同的晶相有关,而CeO2的添加影响MnOx晶态,同时提出了催化剂催化还原NO的机制. 展开更多
关键词 选择性催化还原(SCR) NO MnOx/Al2O3 CeO2 低温脱硝
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沉淀还原法制备高性能CO_2加氢合成甲醇Cu/ZnO/Al_2O_3催化剂 认领 引用 被引量：21
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作者 曹勇 陈立芳 +3 位作者 戴维林 范康年 吴东 孙予罕 《高等学校化学学报》 SCIE EI CAS 北大核心 2003年第7期1296-1298,共3页
A novel coprecipitation-reduction process has been proposed for preparing highly selective Cu/ZnO/Al 2O 3 catalysts for methanol synthesis from CO 2 hydrogenation. Compared to the catalysts prepared by the conventiona... A novel coprecipitation-reduction process has been proposed for preparing highly selective Cu/ZnO/Al 2O 3 catalysts for methanol synthesis from CO 2 hydrogenation. Compared to the catalysts prepared by the conventional method, the new catalysts prepared via the new method exhibit much higher BET surface area and pore size, much smaller crystallite size and higher catalytic activity and selectivity in CO 2 hydrogenation to methanol. It is also found that the molar ratio of Cu + to Cu 0 on the surface of the catalyst obtained by coprecipitation-reduction is much higher than that on the reduced catalyst obtained by the conventional method, which could be crucial for its high activity and selectivity for catalytic hydrogenation of CO 2 to methanol. 展开更多
关键词 沉淀还原法 制备 CO2 加氢合成 甲醇 Cu/ZnO/Al2O3 催化剂 碳酸盐共沉淀 液相化学还原
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沉淀pH对CuO/ZnO/Al_2O_3系催化剂前体性质的影响 认领 引用 被引量：17
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作者 房德仁 刘中民 +3 位作者 黎晓琼 张慧敏 许磊 徐秀峰 《石油化工》 EI CAS 北大核心 2004年第7期622-626,共5页
用并流共沉淀方法制备了一系列CuO／ZnO／Al2O3催化剂前体及催化剂,用XRD,TG-DTG,TPR及微反活性评价等技术考察了沉淀pH对催化剂前体物相组成及焙烧后物相中CuO-ZnO间的作用情况。研究表明,沉淀pH主要对催化剂前体的物相组成有重要影响... 用并流共沉淀方法制备了一系列CuO／ZnO／Al2O3催化剂前体及催化剂,用XRD,TG-DTG,TPR及微反活性评价等技术考察了沉淀pH对催化剂前体物相组成及焙烧后物相中CuO-ZnO间的作用情况。研究表明,沉淀pH主要对催化剂前体的物相组成有重要影响,在不同的沉淀pH下,前体中的物相组成不同。在pH为7的情况下,前体中存在碱式硝酸铜Cu2(NO3)(OH)3、碱式碳酸铜Cu2CO3(OH)2、类碱式碳酸锌(Zn,Cu)5(CO3)2(OH)6及类孔雀石(Cu,Zn)2CO3(OH)2等多种物相;在pH为8-9时,前体中主要存在(Cu,Zn)2CO3(OH)2和(Zn,Cu)5(CO3)2(OH)6两种物相,且其结晶度较低,在此范围内催化剂的活性最好,TPR实验表明,此时催化剂中形成了较多的CuO-ZnO固溶体。实验结果表明,(Cu,Zn)2CO3(OH)2和(Zn,Cu)5(CO3)2(OH)6两种物相对提高催化剂的活性至关重要。 展开更多
关键词 CuO/ZnO/Al2O3系催化剂 前体 相变 pH 活性
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CeO_2/Al_2O_3催化剂的制备表征及在污水处理中的应用 认领 引用 被引量：10
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作者 张兰河 周靖 +3 位作者 郭映辉 张海丰 贾艳萍 王旭明 《农业工程学报》 EI CAS CSCD 北大核心 2017年第1期219-224,共6页
为了提高臭氧催化氧化污水深度处理的效率,分别利用CeO_2和Al_2O_3作为活性组分和载体制备掺杂型CeO_2/Al_2O_3催化剂,通过X-射线衍射、透射电镜、N2吸附脱附曲线、X射线光电子能谱等方法对催化剂性能进行表征,考察CeO_2/Al_2O_3催化活... 为了提高臭氧催化氧化污水深度处理的效率,分别利用CeO_2和Al_2O_3作为活性组分和载体制备掺杂型CeO_2/Al_2O_3催化剂,通过X-射线衍射、透射电镜、N2吸附脱附曲线、X射线光电子能谱等方法对催化剂性能进行表征,考察CeO_2/Al_2O_3催化活性的变化,分析催化臭氧化去除有机物的作用机制。结果表明,制备的掺杂型CeO_2/Al_2O_3催化剂具有较大的比表面积、孔容和孔径,分别达到125 m2/g、0.242 2 cm3/g和7.777 8 nm。催化剂的活性组分主要为高度结晶化立方萤石结构的CeO_2,煅烧并未改变CeO_2的结构晶型。当进水化学需氧量(Chemical oxygen demand)为70~80 mg/L,催化剂用量为110 g/L,臭氧浓度为18 g/m3,p H值为7.8时,COD去除率最高42.8%。较高的催化效率归功于活性物质CeO_2中同时具有Ce3+和Ce4+,加速了臭氧生成更多的强氧化性?OH,催化剂的多孔结构为有机物的降解提供了充足的反应空间。催化剂使用寿命长,当催化剂重复使用5次后,COD去除率仍保持40%以上。 展开更多
关键词 污水 催化剂 臭氧 CeO2/Al2O3 催化臭氧化 污水深度处理
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Zr对CuO/ZnO/Al_2O_3前驱体物相、催化剂结构及其合成甲醇性能的影响 认领 引用 被引量：15
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作者 李忠 刘岩 +1 位作者 范辉 郑华艳 《无机化学学报》 SCIE CAS 北大核心 2010年第7期1245-1251,共7页
采用并流共沉淀法,在CuO/ZnO/Al2O3三元催化剂中加入第四组分Zr,考察了沉淀温度对四元催化剂的前驱体物相组成及浆态床合成甲醇催化活性的影响。通过XRD、DTG、TPR、FTIR、CO-TPD、XPS、HR-TEM等对所制备催化剂及其前驱体的微观结构进... 采用并流共沉淀法,在CuO/ZnO/Al2O3三元催化剂中加入第四组分Zr,考察了沉淀温度对四元催化剂的前驱体物相组成及浆态床合成甲醇催化活性的影响。通过XRD、DTG、TPR、FTIR、CO-TPD、XPS、HR-TEM等对所制备催化剂及其前驱体的微观结构进行了表征。研究表明:Zr促进了绿铜锌矿(Cu,Zn)5(CO3)2(OH)6物相的生成,使催化剂前驱体中绿铜锌矿含量增加,焙烧后的催化剂铜锌协同作用增强,CuO分散度提高,CuO晶粒平均直径只有4.18nm,同时还原温度显著降低为150℃,CO吸附能力增强,结果显著提高了浆态床合成甲醇催化活性和稳定性。与CuO/ZnO/Al2O3三元催化剂相比,80℃沉淀制备的含4%Zr的CuO/ZnO/Al2O3/ZrO2四元催化剂的甲醇时空收率提高了8.67%,失活率降低了65.12%。 展开更多
关键词 甲醇 CuO/ZnO/Al2O3/ZrO2 浆态床 共沉淀
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浆态床中Cu/ZnO/Al_2O_3/ZrO_2+γ-Al_2O_3双功能催化剂一步法合成二甲醚 认领 引用 被引量：14
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作者 左宜赞 张强 +4 位作者 安欣 韩明汉 王铁锋 王金福 金涌 《燃料化学学报》 北大核心 2010年第1期102-107,共6页
采用共沉淀法,制备了纤维状CD501甲醇合成催化剂,采用SEM、TEM、XRD和BET等手段对催化剂进行了表征;并将其进一步和γ-Al2O3进行混合,获得了Cu/ZnO/Al2O3/ZrO2+γ-Al2O3双功能催化剂,考察了其在浆态床中一步法合成二甲醚过程的催化特性... 采用共沉淀法,制备了纤维状CD501甲醇合成催化剂,采用SEM、TEM、XRD和BET等手段对催化剂进行了表征;并将其进一步和γ-Al2O3进行混合,获得了Cu/ZnO/Al2O3/ZrO2+γ-Al2O3双功能催化剂,考察了其在浆态床中一步法合成二甲醚过程的催化特性。结果表明,相比商业催化剂(COM)和LP201催化剂,新型的CD501催化剂具有更大的比表面积和Cu/Zn分散性。对于浆态床中一步法合成二甲醚过程,采用CD501与γ-Al2O3双功能催化剂,相比采用COM或LP201与γ-Al2O3双功能催化剂,CO转化率提高了一倍,且经过270 h测试,CO转化率从61%降至57%,二甲醚时空产率从0.54 g/(g.h)降至0.48 g/(g.h),稳定性显著优于COM催化剂。当反应温度为250℃,压力为4.0 MPa,空速为3 000 mL/(g.h),氢碳比为1.0时,该催化剂应用在浆态床一步法合成二甲醚时,CO转化率为61%,DME时空产率达到0.54 g/(g.h)。 展开更多
关键词 Cu/ZnO/Al2O3/ZrO2催化剂 -γAl2O3 浆态床 二甲醚 甲醇
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Local structural evolutions of CuO/ZnO/Al2O3 catalyst for methanol synthesis under operando conditions studied by in situ quick X-ray absorption spectroscopy 认领 引用 被引量：5
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作者 Xue-Ping Sun Fan-Fei Sun +5 位作者 Song-Qi Gu Jing Chen Xian-Long Du Jian-Qiang Wang Yu-Ying Huang Zheng Jiang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2017年第2期35-43,共9页
In situ quick X-ray absorption spectroscopy(QXAFS) at the Cu and Zn K-edge under operando conditions has been used to unravel the Cu/Zn interaction and identify possible active site of CuO/ZnO/Al_2O_3 catalyst for met... In situ quick X-ray absorption spectroscopy(QXAFS) at the Cu and Zn K-edge under operando conditions has been used to unravel the Cu/Zn interaction and identify possible active site of CuO/ZnO/Al_2O_3 catalyst for methanol synthesis. In this work, the catalyst, whose activity increases with the reaction temperature and pressure, was studied at calcined, reduced, and reacted conditions. TEM and EDX images for the calcined and reduced catalysts showed that copper was distributed uniformly at both conditions. TPR profile revealed two reduction peaks at 165 and 195 °C for copper species in the calcined catalyst. QXAFS results demonstrated that the calcined form consisted mainly of a mixed Cu O and Zn O, and it was progressively transformed into Cu metal particles and dispersed Zn O species as the reduction treatment. It was demonstrated that activation of the catalyst precursor occurred via a Cu^+intermediate, and the active catalyst predominantly consisted of metallic Cu and Zn O evenunder higher pressures. Structure of the active catalyst did not change with the temperature or pressure, indicating that the role of the Zn was mainly to improve Cu dispersion.This indicates the potential of QXAFS method in studying the structure evolutions of catalysts in methanol synthesis. 展开更多
关键词 In situ Quick X-ray absorption spectroscopy CuO/ZnO/Al2O3 catalyst Operando condition
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Cu/Zn比对微波辐射老化制备CuO/ZnO/Al_2O_3催化剂结构和活性的影响 认领 引用 被引量：8
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作者 李忠 刘岩 +2 位作者 何忠 范辉 郑华艳 《化学学报》 SCIE CAS CSCD 北大核心 2011年第5期570-576,共7页
在微波辐射条件下,对共沉淀法制备合成甲醇CuO/ZnO/Al2O3催化剂前驱体的母液进行老化,通过改变Cu/Zn比,研究了微波辐射对催化剂性能的影响,并结合XRD,FTIR,DTG,H2-TPR,XPS等表征手段,探讨了微波辐射对前驱体物相组成及催化剂微观结构的... 在微波辐射条件下,对共沉淀法制备合成甲醇CuO/ZnO/Al2O3催化剂前驱体的母液进行老化,通过改变Cu/Zn比,研究了微波辐射对催化剂性能的影响,并结合XRD,FTIR,DTG,H2-TPR,XPS等表征手段,探讨了微波辐射对前驱体物相组成及催化剂微观结构的影响.结果表明:在微波辐射老化条件下,Cu/Zn比对催化剂前驱体物相组成影响较大,微波辐射有利于绿铜锌矿(Cu,Zn)5(CO3)2(OH)6晶相选择生成.当Cu/Zn比为2.0时,前驱体中含有较多的绿铜锌矿物相,且结晶较好,焙烧后形成的催化剂中CuO-ZnO协同作用较强,CuO分散性好,导致H2还原温度低,在浆态床合成甲醇过程中表现出良好的催化活性和稳定性,甲醇时空收率(STY)达到309.0 g·kg-1·h-1,失活率仅为0.11%/d,远优于常规水浴加热制备的催化剂. 展开更多
关键词 Cu/Zn 微波辐射 甲醇合成 CuO/ZnO/Al2O3催化剂 浆态床
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焙烧温度对二甲醚水蒸气重整制氢Cu/ZnO/Al_2O_3/Cr_2O_3+H-ZSM-5双功能催化剂性能的影响 认领 引用 被引量：9
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作者 李娟 海航 +5 位作者 闫常峰 胡蓉蓉 么志伟 罗伟民 郭常青 李文博 《燃料化学学报》 CSCD 北大核心 2012年第10期1240-1245,共6页
采用共沉淀耦合机械混合法制备了Cu/ZnO/Al2O3/Cr2O3+H-ZSM-5双功能催化剂,并用于二甲醚水蒸气重整制氢反应,结合热重、傅里叶红外光谱、XRD、BET、H2-TPR表征,考察了焙烧温度对Cu/ZnO/Al2O3/Cr2O3催化剂物理化学性质及双功能催化剂催... 采用共沉淀耦合机械混合法制备了Cu/ZnO/Al2O3/Cr2O3+H-ZSM-5双功能催化剂,并用于二甲醚水蒸气重整制氢反应,结合热重、傅里叶红外光谱、XRD、BET、H2-TPR表征,考察了焙烧温度对Cu/ZnO/Al2O3/Cr2O3催化剂物理化学性质及双功能催化剂催化性能的影响。研究结果表明,400℃焙烧时,析出CuO粒子的同时伴有尖晶石相,进而在反应过程中对金属铜粒子起到良好的隔离作用。而焙烧温度较低时,催化剂分解不完全,催化剂活性位较少。焙烧温度大于500℃时,CuO粒子发生二次团聚,同时尖晶石相大量生成,造成催化剂活性位减少,活性较低。合适的焙烧温度为400℃,此时二甲醚转化率为92.9%,氢气收率可达到76.5%,具有较好的反应效果。 展开更多
关键词 Cu/ZnO/Al2O3/Cr2O3+H-ZSM-5催化剂 焙烧温度 水蒸气重整 二甲醚 氢
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微波辐照促进的甲醇水蒸汽重整制氢Cu/ZnO/Al_2O_3催化剂 认领 引用 被引量：9
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作者 张新荣 姚成漳 +5 位作者 王路存 曹勇 吴东 孙予罕 戴维林 范康年 《高等学校化学学报》 SCIE EI CAS 北大核心 2005年第6期1137-1139,共3页
We demonstrate for the first time that a short time of microwave irradiation on the oxide precursor of a Cu/ZnO/Al2O3 catalyst can provide unique opportunity for tailoring the microstructure and activity of the cataly... We demonstrate for the first time that a short time of microwave irradiation on the oxide precursor of a Cu/ZnO/Al2O3 catalyst can provide unique opportunity for tailoring the microstructure and activity of the catalyst for methanol steam reforming. It is shown by in situ XRD that a considerable increase in the microstrain of Cu nanocrystals could be achieved in the catalysts processed by microwave irradiation for 310 min, which correlates well with the enhanced CH3OH conversion as observed on the corresponding samples. The present work also confirms that although the high specific surface area of Cu is a prerequisite for catalytic activity, it does not account for the observed changes in activity and selectivity alone without taking bulk microstructural changes into account. 展开更多
关键词 甲醇水蒸汽重整 Cu/ZnO/Al2O3催化剂 微波辐照 微观应变 原位XRD
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老化时间对Cu/ZnO/Al_2O_3合成甲醇催化剂性能的影响 认领 引用 被引量：24
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作者 房德仁 刘中民 +1 位作者 徐秀峰 张慧敏 《燃料化学学报》 北大核心 2006年第1期96-99,共4页
并流共沉淀法制备了CuO/ZnO/A l2O3催化剂前驱体及催化剂,用XRD、TG-DTG、TPR、N2吸附及加压微反活性评价技术,考察了母料老化时间对催化剂前驱体物相组成及焙烧后物料中CuO-ZnO间的作用和物化性能的影响,提出了催化剂母料物相随老化时... 并流共沉淀法制备了CuO/ZnO/A l2O3催化剂前驱体及催化剂,用XRD、TG-DTG、TPR、N2吸附及加压微反活性评价技术,考察了母料老化时间对催化剂前驱体物相组成及焙烧后物料中CuO-ZnO间的作用和物化性能的影响,提出了催化剂母料物相随老化时间的变化。研究表明,老化时间对催化剂活性的影响是通过改变催化剂比表面积及形成CuO-ZnO固溶体的结果。 展开更多
关键词 CuO/ZnO/Al2O3催化剂 合成甲醇 前驱体 老化时间
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