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Zr(Ⅳ) surface sites determine CH3OH formation rate on Cu/ZrO2/SiO2-CO2 hydrogenation catalysts 认领 引用 被引量：3
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作者 Erwin Lam Kim Larmier +3 位作者 Shohei Tada Patrick Wolf Olga V. Safonova Christophe Copéret 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第11期1741-1748,共8页
Cu/ZrO2/SiO2 are efficient catalysts for the selective hydrogenation of CO2 to CH3OH. In order to understand the role of ZrO2 in these mixed-oxides based catalysts, in situ X-ray absorption spectroscopy has been carri... Cu/ZrO2/SiO2 are efficient catalysts for the selective hydrogenation of CO2 to CH3OH. In order to understand the role of ZrO2 in these mixed-oxides based catalysts, in situ X-ray absorption spectroscopy has been carried out on the Cu and Zr K-edge. Under reaction conditions, Cu remains metallic, while Zr is present in three types of coordination environment associated with 1) bulk ZrO2, 2) coordinatively saturated and 3) unsaturated Zr(Ⅳ) surface sites. The amount of coordinatively unsaturated Zr surface sites can be quantified by linear combination fit of reference X-Ray absorption near edge structure (XANES) spectra and its amount correlates with CH3OH formation rates, thus indicating the importance of Zr(Ⅳ) Lewis acid surface sites in driving the selectivity toward CH3OH. This finding is consistent with the proposed mechanism, where CO2 is hydrogenated at the interface between the Cu nanoparticles that split H2 and Zr(Ⅳ) surface sites that stabilizes reaction intermediates. 展开更多
关键词 CO2 hydrogenation ZrO2/SiO2 supported Cu nanoparticles Lewis acidic surface sites In situ X-ray absorption spectroscopy
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Efficient production of biodiesel from both esterification and transesterification over supported SO2-_4–MoO_3–ZrO_2–Nd_2O_3/SiO_2 catalysts 认领 引用 被引量：7
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作者 Xiuqin Li Dongmei Tong Changwei Hu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第4期463-471,共9页
SO2-4–Mo O3–Zr O2–Nd2O3/Si O2（SMZN/Si O2） catalysts for the production of biodiesel via both esterification and transesterification were prepared and characterized by N2adsorption-desorption isotherms,X-ray diffr... SO2-4–Mo O3–Zr O2–Nd2O3/Si O2（SMZN/Si O2） catalysts for the production of biodiesel via both esterification and transesterification were prepared and characterized by N2adsorption-desorption isotherms,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,thermogravimetry analysis（TGA）,ammonia adsorption Fourier transform infrared spectra（NH3-FTIR）,and ammonia adsorption temperature programmed desorption（NH3-TPD） to reveal the dependence of the stable catalytic activity on calcination time. The reason for catalyst deactivation was also studied. The calcination time remarkably affected the types of active centers on SMZN/Si O2-2,and 4 h was found to be the optimal calcination time. SO4 species bonded with small size Zr O2 were found to be the stable active centers,where the leaching of SO2-4and the deposition of coke were inhibited. The deposition of coke was easier on large size Zr O2 than on small size ones. Calcination in air flow could eliminate the deposited coke to recover the deactivated catalysts. 展开更多
关键词 Biodiesel SMZN/SiO2solid acids Stable active centers Small size ZrO2
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ZrO_2助剂对Ni/SiO_2催化剂CO甲烷化催化活性及其吸附性能的影响 认领 引用 被引量：27
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作者 武瑞芳 张因 +2 位作者 王永钊 高春光 赵永祥 《燃料化学学报》 北大核心 2009年第5期577-582,共6页
采用连续流动微反装置和原位漫反射红外光谱法考察了Ni/SiO2及添加ZrO2助剂的Ni/ZrO2-SiO2催化剂CO甲烷化催化活性和吸附性能。结果表明,在CO体积分数1%、空速5000 h-1、常压的反应条件下,200℃时Ni/ZrO2-SiO2催化剂可将CO完全转化。而... 采用连续流动微反装置和原位漫反射红外光谱法考察了Ni/SiO2及添加ZrO2助剂的Ni/ZrO2-SiO2催化剂CO甲烷化催化活性和吸附性能。结果表明,在CO体积分数1%、空速5000 h-1、常压的反应条件下,200℃时Ni/ZrO2-SiO2催化剂可将CO完全转化。而相同反应条件下Ni/SiO2催化剂上CO的转化率仅为35%,直至270℃时方可将CO完全转化。由此可见,ZrO2助剂的添加明显提高了Ni/ZrO2-SiO2催化剂的CO甲烷化催化活性。同时,ZrO2助剂的添加显著提高了Ni/ZrO2-SiO2催化剂对CO的吸附能力,H2存在时可通过在较低温度时形成较多的桥式羰基氢化物来提高Ni/ZrO2-SiO2催化剂的CO甲烷化催化活性;CO甲烷化反应条件下,Ni/SiO2和Ni/ZrO2-SiO2催化剂上C—O键的削弱和断裂是经由羰基氢化物-多氢羰基氢化物的途径,而不是经由C—O键的直接断裂途径。 展开更多
关键词 Ni/SiO2催化剂 ZrO2助剂 CO甲烷化 吸附
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Preparation,characterization and catalytic properties of S_2O_82-/ZrO_2-CeO_2 solid superacid catalyst 认领 引用 被引量：34
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作者 樊国栋 沈茂 +1 位作者 张昭 贾发瑞 《Journal of Rare Earths》 SCIE EI CAS 2009年第3期437-442,共6页
A novel solid superacid catalyst S2O8^2-/ZrO2-CeO2 was prepared by a coprecipitation method and characterized by means of XRD FTIR, BET, TEM and DSC/TG analysis methods. The results indicated that incorporation of app... A novel solid superacid catalyst S2O8^2-/ZrO2-CeO2 was prepared by a coprecipitation method and characterized by means of XRD FTIR, BET, TEM and DSC/TG analysis methods. The results indicated that incorporation of appropriate amounts of Ce into the catalyst was beneficial to the formation of sole tetragonal ZrO2 and effectively prevented from the formation of monoclinic ZrO〉 and restrained the loss of sulfated species. XRD revealed the presence of tetragonal Ce0.16Zr0.84O2phase in the case of S2O8^2-/ZrO2-CeO2 calcined above 500 ℃. Catalytic activities of S2O8^2-/ZrO2-CeO2 for the esterification of lactic acid with n-butanol was studied. The results showed that the optimum conditions were as follows： calcination temperature of the catalyst 600 ℃, n（lactic acid）：n（n-butyl alcohol）=1.0：3.0, w（S2O8^2-/ZrO2- CeO2）=12.0%, reaction temperature 145 ℃, and reaction time 2 h. The esterification efficiency of lactic acid was about 96.6%. 展开更多
关键词 solid superacid catalyst S2O8^2-/ZrO2-CeO2 n-butyl lactate esterification rare earths
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Effect of SiO2 addition on NH4HSO4 decomposition and SO2 poisoning over V2O5-MoO3/TiO2-CeO2 catalyst 认领 引用 被引量：11
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作者 Chengqiang Zheng Teng Cheng +2 位作者 Linjun Yang Hao Wu Hongmei Fan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第5期279-291,共13页
The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition beha... The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition behavior and SO2 poisoning over V2 O5-MoO3/TiO2 catalysts modified with CeO2 and SiO2 were investigated.By the means of characterization analysis,it was found that the addition of SiO2 into VMo/Ti-Ce had an impact on the interaction existed between catalyst surface atoms and NH4 HSO4.Temperatureprogrammed methods and in situ diffused reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments indicated that the doping of SiO2 promoted the decomposition of deposited NH4 HSO4 on VMo/Ti-Ce catalyst surface by reducing the thermal stability of NH4 HSO4 and enhancing the NH4 HSO4 reactivity with NO in low temperature.And this improvement may be the reason for the better catalytic activity than VMo/Ti-Ce in the case of NH4 HSO4 deposition.Accompanied with cerium sulfate species generated over catalyst surface,the conversion of SO2 to SO3 was inhibited in SiCe mixed catalyst.The addition of SiO2 could promote the decomposition of cerium sulfate,which may be a potential strategy to enhance the resistance of SO2 poisoning over CeO2-modifed catalysts. 展开更多
关键词 CeO2-doped SCR catalyst SiO2 addition NH4HSO4 decomposition SO2 poisoning Cerium sulfate
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Highly selective CO methanation over amorphous Ni-Ru-B/ZrO2catalyst 认领 引用 被引量：15
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作者 Qi Hai Liu Xin Fa Dong Wei Ming Lin 《Chinese Chemical Letters》 SCIE CAS 2009年第8期889-892,共4页
Amorphous Ni-Ru-B/ZrO2 catalyst was prepared by the means of chemical reduction,and selective CO methanation as a strategy for CO removal in fuel processing applications was investigated over the amorphous Ni-Ru-B/ZrO... Amorphous Ni-Ru-B/ZrO2 catalyst was prepared by the means of chemical reduction,and selective CO methanation as a strategy for CO removal in fuel processing applications was investigated over the amorphous Ni-Ru-B/ZrO2 catalyst.The result showed that,at the temperature of 210-230℃,the catalyst was shown to be capable of reducing CO in a hydrogen-rich reformate to less than 10 ppm,while keeping the CO2conversion below 1.55%and the hydrogen consumption below 6.50%.?2009 Xin Fa Dong.Published by Elsevier B.V.on behalf of Chinese Chemical Society.All rights reserved. 展开更多
关键词 Selective methanation CO Amorphous Ni-Ru-B/ZrO2 catalyst
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Effect of ZrO_2 Crystalline Phase on the Performance of Ni-B/ZrO_2 Catalyst for the CO Selective Methanation 认领 引用 被引量：8
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作者 刘其海 廖列文 +1 位作者 刘自力 董新法 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第3期434-438,共5页
Amorphous Ni-B/ZrO2 catalysts were prepared by coprecipitation-chemical reduction with KBH4 aqueous solution,and various crystalline phase ZrO2(amorphous-ZrO2,tetragonal-ZrO2 and monoclinic-ZrO2) supported Ni-B cataly... Amorphous Ni-B/ZrO2 catalysts were prepared by coprecipitation-chemical reduction with KBH4 aqueous solution,and various crystalline phase ZrO2(amorphous-ZrO2,tetragonal-ZrO2 and monoclinic-ZrO2) supported Ni-B catalysts were obtained by thermal treatment in 5%H2-N2 stream at different temperature.The effect of ZrO2 polymorphs and the treatment temperature on the catalytic performance for the CO selective methanation were investigated,and the catalysts were characterized by N2 physisorption,Powder X-ray diffraction(XRD), Temperature-Programmed Desorption(CO-TPD and H2-TPD),and Differential Scanning Calorimeter(DSC).The treatment temperature affected strongly the crystalline structure of ZrO2,and the CO methanation activity and selectivity of the Ni-B/ZrO2 catalysts were significantly influenced by the crystalline phase of ZrO2.Of the three forms of ZrO2 polymorphs(amorphou-ZrO2,tetragonal-ZrO2 and monoclinic-ZrO2),the amorphous-ZrO2 supported nickle catalyst showed highest CO methanation activity,attributing in large part to the largest specific surface area and the optimum CO/H2 absorption intensity of the Ni-B/amorphous-ZrO2 catalyst. 展开更多
关键词 crystalline phase carbon monoxide selective methanation Ni-B/ZrO2 catalyst
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Co/ZrO_2/SiO_2催化剂F-T合成反应研究 认领 引用 被引量：3
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作者 常杰 滕波涛 +5 位作者 白亮 张荣乐 陈建刚 相宏伟 李永旺 孙予罕 《天然气化工—C1化学与化工》 北大核心 2005年第4期1-8,13,共8页
采用等温积分固定床反应器,在小粒径催化剂、高空速、消除传质作用影响的条件下,对Co/ZrO2/SiO2催化剂上的F-T合成本征反应性能进行了详细考察,结果表明CH4和C2烃的生成活化能较高,导致其偏离Anderson-Schulz-Flory分布规律;在转化率不... 采用等温积分固定床反应器,在小粒径催化剂、高空速、消除传质作用影响的条件下,对Co/ZrO2/SiO2催化剂上的F-T合成本征反应性能进行了详细考察,结果表明CH4和C2烃的生成活化能较高,导致其偏离Anderson-Schulz-Flory分布规律;在转化率不高的情况下,F-T合成中的CO消耗速率表现出对H2分压的线性依赖关系,而反应总压对CO转化率和产物分布的影响不明显.较高的反应温度和H2分压会促进烯烃的二次加氢反应,从而降低烃生成的链增长因子.H2O的分压过高会造成活性相Co0的氧化,同时抑制F-T反应活性且不利于二次反应的进行.对于以重质烃为目标产物的Co/ZrO2/SiO2催化剂而言,适宜的操作条件为:反应温度483 K、V(H2)/V(CO)=2.0和反应压力2.0～3.0MPa. 展开更多
关键词 Co/ZrO2/SiO2催化剂 Fischer-Tropsch合成 烃分布 反应性能
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The effect of ethanol on the performance of CrO_x/SiO_2 catalysts during propane dehydrogenation 认领 引用 被引量：5
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作者 李利娜 朱文良 +6 位作者 石磊 刘勇 刘红超 倪友明 刘世平 周慧 刘中民 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第3期359-366,共8页
The effects of ethanol vapor pretreatment on the performance of CrOx/SiO2 catalysts during the dehydrogenation of propane to propylene were studied with and without the presence of CO2.The catalyst pretreated with eth... The effects of ethanol vapor pretreatment on the performance of CrOx/SiO2 catalysts during the dehydrogenation of propane to propylene were studied with and without the presence of CO2.The catalyst pretreated with ethanol vapor exhibited better catalytic activity than the pristine CrOx/SiO2,generating 41.4% propane conversion and 84.8% propylene selectivity.The various catalyst samples prepared were characterized by X-ray diffraction,transmission electron microscopy,temperature-programmed reduction,X-ray photoelectron spectroscopy and reflectance UV-Vis spectroscopy.The data show that coordinative Cr^3＋ species represent the active sites during the dehydrogenation of propane and that these species serve as precursors for the generation of Cr^3＋.Cr^3＋ is reduced during the reaction,leading to a decrease in catalytic activity.Following ethanol vapor pretreatment,the reduced CrOx in the catalyst is readily re-oxidized to Cr^6＋ by CO2.The pretreated catalyst thus exhibits high activity during the propane dehydrogenation reaction by maintaining the active Cr^3＋ states. 展开更多
关键词 Propane Dehydrogenation CrOx/SiO2 catalyst Ethanol vapor pretreatment Carbon dioxide
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含SiO_2,ZrO_2微粒复合镀镍层抗高温氧化性能 认领 引用 被引量：7
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作者 杜岩滨 朱立群 +1 位作者 刘慧丛 白真权 《北京航空航天大学学报》 EI CAS 北大核心 2004年第10期1003-1007,共5页
通过对含有SiO2 ,ZrO2 微粒复合电沉积的研究 ,在Cu合金表面分别获得了含量 (原子数分数 )为 1 1 .3%SiO2 ,5 .31 %ZrO2 微粒的Ni基复合镀层 .通过在 80 0℃、90 0℃条件下的高温氧化和热震循环试验 ,研究了这种复合镀镍层的高温氧化性... 通过对含有SiO2 ,ZrO2 微粒复合电沉积的研究 ,在Cu合金表面分别获得了含量 (原子数分数 )为 1 1 .3%SiO2 ,5 .31 %ZrO2 微粒的Ni基复合镀层 .通过在 80 0℃、90 0℃条件下的高温氧化和热震循环试验 ,研究了这种复合镀镍层的高温氧化性能和界面结合特性 .结果表明 :经过 40h的高温氧化 ,2种复合镀镍层的抗氧化性能均达到抗氧化级 ,而且含SiO2 微粒的复合镀镍层的抗氧化性能优于含ZrO2 微粒的复合镀镍层 ;经过 5 5次冷热循环 ,含SiO2 展开更多
关键词 复合材料 高温抗氧化涂层 SiO2 ZrO2微粒
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SiO_2改性ZrO_2气凝胶高温稳定性 认领 引用 被引量：4
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作者 李晓雷 王庆浦 +2 位作者 季惠明 孙晓红 何健 《宇航材料工艺》 CAS CSCD 北大核心 2014年第1期65-68,共4页
以ZrOCl2·8H2O为锆源,以环氧丙烷(PO)为凝胶促进剂制备ZrO2凝胶,将ZrO2凝胶置于正硅酸乙酯乙醇溶液中老化,再结合高温超临界干燥工艺制备了SiO2改性ZrO2气凝胶。通过对比ZrO2气凝胶和SiO2改性ZrO2气凝胶高温结构转变讨论了SiO2改性... 以ZrOCl2·8H2O为锆源,以环氧丙烷(PO)为凝胶促进剂制备ZrO2凝胶,将ZrO2凝胶置于正硅酸乙酯乙醇溶液中老化,再结合高温超临界干燥工艺制备了SiO2改性ZrO2气凝胶。通过对比ZrO2气凝胶和SiO2改性ZrO2气凝胶高温结构转变讨论了SiO2改性对ZrO2气凝胶高温结构的影响。采用FT-IR、XRD、SEM和TEM等分析手段对样品进行高温结构表征。结果表明:采用正硅酸乙酯乙醇溶液老化ZrO2凝胶后,在ZrO2凝胶粒子表面形成了一层SiO2包裹层,这层SiO2包裹层显著抑制了ZrO2的扩散、成核和生长过程,高温稳定性得以显著提高。 展开更多
关键词 ZrO2气凝胶 SiO2 超临界干燥 高温稳定性
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纯丙类聚氨酯/SiO_2-ZrO_2光固化纳米复合透明耐磨涂料涂层的制备及性能 认领 引用 被引量：8
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作者 董骏 梁红波 吕程 《材料保护》 CAS CSCD 北大核心 2016年第8期15-19,6-7,共5页
目前，鲜见在纯丙类光固化聚氨酯中引入SiO2和ZrO2纳米粒子的报道。采用溶液聚合法制备了纯丙类聚氨酯丙烯酸酯，采用溶胶凝胶法制备SiO2及ZrO2无机溶胶，将无机前驱体与有机相进行杂化，制备了一系列可光固化的有机无机杂化涂料。采用... 目前，鲜见在纯丙类光固化聚氨酯中引入SiO2和ZrO2纳米粒子的报道。采用溶液聚合法制备了纯丙类聚氨酯丙烯酸酯，采用溶胶凝胶法制备SiO2及ZrO2无机溶胶，将无机前驱体与有机相进行杂化，制备了一系列可光固化的有机无机杂化涂料。采用红外光谱（FTIR）和核磁共振氢谱（1H—NMR）对杂化涂料及其涂层进行了结构表征，采用场发射扫描电镜（SEM）研究了杂化涂料涂层的表面形貌，并对涂层进行了物理性能、透明性以及耐磨性能测试。结果表明：杂化涂料涂层中，无机粒子均匀分散在有机相中，且无机粒子半径为20～30nm：无机粒子的引入显著提升了涂层的物理性能及耐磨性能，涂层的硬度从1H提升到6H，磨耗量减少了80％。 展开更多
关键词 聚氨酯丙烯酸酯 紫外光固化 耐磨性 有机无机杂化 SiO2 ZrO2
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ZrO_2-SiO_2膜的制备和结构研究 认领 引用 被引量：13
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作者 黄永前 郑昌琼 +1 位作者 胡英 张育林 《功能材料》 EI CAS 北大核心 2000年第2期204-206,共3页
以正硅酸乙酯和氧氯化锆为原料 ,用溶胶 -凝胶法制备了无支撑ZrO2 -SiO2 膜。应用DTA -TG、XRD、SEM和BET等测试技术对无支撑ZrO2 -SiO2 膜的结构、表面形貌和孔径进行了表征 ,结果表明ZrO2 -SiO2 凝胶膜虽在 46 7℃开始出现少量单斜ZrO... 以正硅酸乙酯和氧氯化锆为原料 ,用溶胶 -凝胶法制备了无支撑ZrO2 -SiO2 膜。应用DTA -TG、XRD、SEM和BET等测试技术对无支撑ZrO2 -SiO2 膜的结构、表面形貌和孔径进行了表征 ,结果表明ZrO2 -SiO2 凝胶膜虽在 46 7℃开始出现少量单斜ZrO2 ,但在 5 0 0℃和 12 0 0℃热处理后的主晶相均为四方ZrO2 ,显然SiO2 的存在阻碍了四方相ZrO2 向单斜相ZrO2 转变的过程 ,ZrO2 -SiO2 膜具有比ZrO2 膜更高的热稳定性 ,在95 0℃烧结的无支撑ZrO2 -SiO2 膜孔径稍呈双峰分布 ,其最可几孔径为 3 .3 5nm。 展开更多
关键词 ZrO2-SiO2膜 溶胶-凝胶 制备 结构 热稳定性
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耐高温ZrO_2/SiO_2复合气凝胶的制备及表征 认领 引用 被引量：4
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作者 邹文兵 沈军 +5 位作者 祖国庆 邹丽萍 吴宇 关大勇 张蓉艳 姚献东 《南京工业大学学报（自然科学版）》 CAS 北大核心 2016年第2期42-46,共5页
以锆酸四丁酯为锆源,采用溶胶-凝胶法结合化学液相沉积(CLD),即在凝胶老化过程中用部分水解的锆酸四丁酯和正硅酸四乙酯进行液相修饰,经过乙醇超临界干燥(SCFD)制备耐高温ZrO_2/SiO_2块体复合气凝胶。采用透射电子显微镜(TEM)、傅里叶... 以锆酸四丁酯为锆源,采用溶胶-凝胶法结合化学液相沉积(CLD),即在凝胶老化过程中用部分水解的锆酸四丁酯和正硅酸四乙酯进行液相修饰,经过乙醇超临界干燥(SCFD)制备耐高温ZrO_2/SiO_2块体复合气凝胶。采用透射电子显微镜(TEM)、傅里叶红外光谱仪(FT-IR)、X线衍射仪(XRD)、N_2吸附分析仪等仪器表征了ZrO_2/SiO_2复合气凝胶的形貌、表面基团、晶相和孔结构,着重研究其耐热性能。结果表明:制备的ZrO_2/SiO_2复合气凝胶具有优秀的耐温性能,1 000℃处理2 h后,仍为四方相,线收缩率仅为12%,比表面积高达186 m2/g。 展开更多
关键词 ZrO2/SiO2复合气凝胶 溶胶-凝胶法 化学液相沉积 耐高温
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ZrO_2/SiO_2多层膜的化学法制备研究 认领 引用 被引量：5
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作者 杨帆 沈军 +4 位作者 吴广明 孙骐 付甜 张志华 王珏 《强激光与粒子束》 EI CAS 北大核心 2003年第4期326-330,共5页
　分别以ZrOCl2·8H2O和正硅酸乙酯为原料,采用溶胶 凝胶工艺制备了性能稳定的ZrO2和SiO2溶胶。用旋转镀膜法分别在K9玻璃和单晶硅片上制备了ZrO2/SiO2多层膜。采用溶剂替换和紫外光处理等手段,有效地解决了ZrO2/SiO2多层膜中膜层... 　分别以ZrOCl2·8H2O和正硅酸乙酯为原料,采用溶胶 凝胶工艺制备了性能稳定的ZrO2和SiO2溶胶。用旋转镀膜法分别在K9玻璃和单晶硅片上制备了ZrO2/SiO2多层膜。采用溶剂替换和紫外光处理等手段,有效地解决了ZrO2/SiO2多层膜中膜层开裂和膜间渗透等问题。应用扫描电子显微镜观测了薄膜的表面和剖面微观形貌,并用椭偏仪测得薄膜的厚度和折射率,研究了薄膜厚度、折射率与热处理温度、紫外光处理时间的关系,对所获得薄膜的紫外 可见、红外光谱进行了分析。用输出波长1064nm,脉宽15ns的电光调Q激光系统产生的强激光进行了单层膜的辐照实验,结果发现溶剂替换后激光损伤阈值有所提高。 展开更多
关键词 ZrO2/SiO2多层膜 氧化锆 二氧化硅 化学法制备 溶胶-凝胶工艺 紫外光处理 激光损伤阈值 旋转镀膜法
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ZrO_2助剂对Co/SiO_2催化剂在Fischer-Tropsch合成反应中稳定性的影响 认领 引用 被引量：4
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作者 周玮 房克功 +1 位作者 陈建刚 孙予罕 《燃料化学学报》 北大核心 2006年第4期461-465,共5页
采用TPR、XRD、XPS和H2脉冲吸附等表征手段考察了ZrO2助剂对Co/S iO2催化剂在F ischer-Tropsch(F-T)合成中稳定性的影响。结果表明,ZrO2的引入促进了钴物种在催化剂上的分散并明显抑制了该催化剂的失活;在反应过程中ZrO2起到结构助剂的... 采用TPR、XRD、XPS和H2脉冲吸附等表征手段考察了ZrO2助剂对Co/S iO2催化剂在F ischer-Tropsch(F-T)合成中稳定性的影响。结果表明,ZrO2的引入促进了钴物种在催化剂上的分散并明显抑制了该催化剂的失活;在反应过程中ZrO2起到结构助剂的作用,明显抑制了Co/S iO2催化剂上硅酸钴或水合硅酸钴物种的生成。 展开更多
关键词 Fischer—Tropsch合成 Co/SiO2 ZrO2 助剂 失活
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Sol-Gel法制备Al_2O_3-SiO_2-TiO_2-ZrO_2复合陶瓷膜的研究 认领 引用 被引量：4
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作者 徐晓虹 吴建锋 +1 位作者 白占良 张英 《中国陶瓷》 CAS 2003年第6期21-23,共3页
将Sol-Gel法应用于无机膜的制备,成功的研制出一种新型的膜面平整、膜厚均匀且无宏观缺陷的Al2O3-SiO2-TiO2-ZrO2复合陶瓷膜,复合膜含有γ-Al2O3、SiO2、TiO2、ZrO2和Al2SiO5等晶相,改变体系组成含量,晶相组成和含量随之变化,从而引起... 将Sol-Gel法应用于无机膜的制备,成功的研制出一种新型的膜面平整、膜厚均匀且无宏观缺陷的Al2O3-SiO2-TiO2-ZrO2复合陶瓷膜,复合膜含有γ-Al2O3、SiO2、TiO2、ZrO2和Al2SiO5等晶相,改变体系组成含量,晶相组成和含量随之变化,从而引起膜的显微结构的变化。利用XRD、SEM、AFM、EPMA等测试手段重点研究了膜的表面形貌和显微结构,并分析了添加剂、热处理方式等对膜的表面形貌和显微结构影响。 展开更多
关键词 溶胶—凝胶法 Al2O3—SiO2—TiO2—ZrO2复合陶瓷膜 表面形貌 显微结构
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High Activity and Selectivity of Cu/SiO_2 Catalyst for the Direct Synthesis of Indole 认领 引用 被引量：3
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作者 Lei SHI Jun Ming SUN +2 位作者 Xin Ping WANG Xan Yun SU Tian Xi CAI 《Chinese Chemical Letters》 SCIE CAS 2002年第3期211-212,共2页
Copper supported over silica exhibited very high activity and selectivity for the direct synthesis of indole at atmospheric pressure. Under the reaction temperature of 325C,the yield of indole could obtain 88%.
关键词 Cu/SiO2 catalyst direct synthesis of indole aniline ethylene glycol.
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溶胶-凝胶法制备SiO_2/ZrO_2无机复合膜的研究 认领 引用 被引量：7
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作者 张克铮 邱春阳 《材料科学与工艺》 EI CAS 北大核心 2007年第2期251-254,共4页
以硅酸乙酯和氧氯化锆为先驱体,用乙醇为溶剂,采用溶胶——凝胶法于室温下在Al2O3基体上制备了ZrO2/SiO2无机复合膜.重点考察了涂膜温度、ZrOCl2摩尔百分含量、溶胶浓度及添加剂对膜性能的影响.结果表明:在较高的温度下涂膜可以提高膜... 以硅酸乙酯和氧氯化锆为先驱体,用乙醇为溶剂,采用溶胶——凝胶法于室温下在Al2O3基体上制备了ZrO2/SiO2无机复合膜.重点考察了涂膜温度、ZrOCl2摩尔百分含量、溶胶浓度及添加剂对膜性能的影响.结果表明:在较高的温度下涂膜可以提高膜的性能;ZrOCl2的存在对渗透比的影响不大,但能够提高溶胶的交联度,从而提高制膜效率,同时也有利于渗透通量的提高;采用浓溶胶和稀溶胶结合的方式涂膜不但可以提高制膜效率,还可以提高膜的性能.添加剂TEABr能够均化膜孔径,提高膜的性能. 展开更多
关键词 溶胶——凝胶法 ZrO2/SiO2 渗透比 渗透通量 无机复合膜
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Synthesis of Biodiesel Using ZrO_2 Polycrystalline Ceramic Foam Catalyst in a Tubular Reactor 认领 引用 被引量：3
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作者 Wang Yunpu Fan Liangliang +5 位作者 Dai Leilei Liu Yuhuan Ruan Roger Liu Shitao Zhang Xueqin Wan Yiqin 《China Petroleum Processing & Petrochemical Technology》 CAS 2015年第3期67-75,共9页
With the help of the ceramic foam research efforts and preparation techniques, the ZrO2 polycrystalline ceramic foam catalyst was synthesized, and its characteristics, including the crystal structure, the phase compos... With the help of the ceramic foam research efforts and preparation techniques, the ZrO2 polycrystalline ceramic foam catalyst was synthesized, and its characteristics, including the crystal structure, the phase composition, the acid–base properties, and the microstructure, were analyzed by XRD, SEM, Py-IR, and BET techniques. The performance of the ZrO2 polycrystalline ceramic foam catalyst in a tubular reactor was investigated via biodiesel synthesis using S. wilsoniana oil and methanol. The effects of reaction conditions(i.e., reaction temperature, reaction pressure, and volume ratio of methanol to S. wilsoniana oil) on transesterification efficiency were investigated, and the reaction conditions were optimized using RSM. The optimum reaction temperature, reaction pressure, and volume ratio of methanol to S. wilsoniana oil were determined to be 290 ℃, 10 MPa, and 4:1, respectively. Under this condition, the FAME content in the product oil reached 98.38%. The performance of the ZrO2 polycrystalline ceramic foam catalyst synthesized in this work for biodiesel synthesis from S. wilsoniana oil with a moisture content of 7.1% and an acid value of 130.697 mg KOH/g was examined, and the FAME content in the product oil was found to be 93% and 97.67%, respectively. The FAME content in the product oil exceeded 97% after five consecutive cycles(12 h per cycle of use) of the catalyst. The proposed catalyst represents a new type of solid catalyst with excellent acid resistance, water resistance, esterification efficiency, and catalytic stability. 展开更多
关键词 ZrO2 polycrystalline ceramic foam catalyst tubular reactor S. wilsoniana oil biodiesel
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