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用原位红外技术研究Ag-MoO_3/ZrO_2催化丙烯气相环氧化反应 认领 引用 被引量：4
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作者 金国杰 郭杨龙 +3 位作者 刘晓晖 姚伟 郭耘 卢冠忠 《化学学报》 SCIE CAS 北大核心 2006年第19期1941-1946,共6页
制备了对丙烯直接气相环氧化具有优良催化性能的Ag-MoO3/ZrO2催化剂,采用原位FT-IR技术研究了丙烯、环氧丙烷及丙烯和氧气混合气在载体和催化剂上的吸附及反应行为.研究表明,丙烯在ZrO2载体和20%Ag-4%MoO3/ZrO2催化剂上吸附后,均不发生... 制备了对丙烯直接气相环氧化具有优良催化性能的Ag-MoO3/ZrO2催化剂,采用原位FT-IR技术研究了丙烯、环氧丙烷及丙烯和氧气混合气在载体和催化剂上的吸附及反应行为.研究表明,丙烯在ZrO2载体和20%Ag-4%MoO3/ZrO2催化剂上吸附后,均不发生化学反应,而环氧丙烷在ZrO2载体上吸附后于400℃发生开环反应,在20%Ag-4%MoO3/ZrO2催化剂上吸附后于300℃发生开环反应.当丙烯和氧气混合气在ZrO2载体上共吸附后,随着反应温度从室温升高至400℃,二者开始反应生成CO2和H2O;混合气在20%Ag-4%MoO3/ZrO2催化剂上共吸附后于350℃开始反应.对比非负载型Ag-MoO3催化剂的研究结果可见,ZrO2载体的存在使催化剂的活性下降的同时,提高了对产物环氧丙烷的选择性. 展开更多
关键词 丙烯 气相环氧化 环氧丙烷 Ag-MoO3/ZrO2催化剂 原位红外光谱
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γ-Al2O3Supported SO42-/ZrO2Solid Superacid Catalysts for n-Pentane Isomerization 认领 引用 被引量：2
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作者 Li Zhao Xiaoshuang Cheng +2 位作者 Ye Hu Shuqing Ma Yingjun Wang 《Modern Research in Catalysis》 2014年第3期89-93,共5页
A solid superacid catalyst Pt-SO42-/ZrO2-A12O3 for n-pentane isomerization, was prepared by incipient-wetness impregnation. Preparetion conditions, namely, calcination temperature, concentration of sulfuric acid solut... A solid superacid catalyst Pt-SO42-/ZrO2-A12O3 for n-pentane isomerization, was prepared by incipient-wetness impregnation. Preparetion conditions, namely, calcination temperature, concentration of sulfuric acid solution used in impregnation and Al2O3 concentration, were varied to investigate the effects on catalytic performance of Pt-SO42-/ZrO2-A12O3. The results showed that the PtSZA catalyst exhibited excellent catalytic performance for n-pentane isomerization. Under optimized preparation conditions of calcination temperature of 650°C, reaction time for 3 h, concentration of sulfuric acid solution for 0.5 mol/L, 30% of Al2O3 concentration and 0.3% of Pt concentration, the n-pentane conversion and isopentane selectivity of Pt-SO42-/ZrO2-A12O3 could reach up to 62.17% and 91.60%, respectively. 展开更多
关键词 SO42-/ZrO2 n-Pentane Isomerization γ-Al2O3 Supported Superacid Catalysts
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Improving the denitration performance and K-poisoning resistance of the V_2O_5-WO_3/TiO_2 catalyst by Ce4+ and Zr4+ co-doping 认领 引用 被引量：22
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作者 Jun Cao Xiaojiang Yao +4 位作者 Fumo Yang Li Chen Min Fu Changjin Tang Lin Dong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第1期95-104,共10页
A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐W... A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐WO3/TiO2 catalyst.The physicochemical properties were investigated by using XRD,BET,NH3‐TPD,H2‐TPR,and XPS,and the catalytic performance and K‐poisoning resistance were evaluated via a NH3‐SCR model reaction.Ce^4+and Zr^4+co‐doping were found to enhance the conversion of NOx,and exhibit the best K‐poisoning resistance owing to the largest BET‐specific surface area,pore volume,and total acid site concentration,as well as the minimal effects on the surface acidity and redox ability from K poisoning.The V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst also presents outstanding H2O+SO2 tolerance.Finally,the in situ DRIFTS reveals that the NH3‐SCR reaction over the V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst follows an L‐H mechanism,and that K poisoning does not change the reaction mechanism. 展开更多
关键词 V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst Co‐doping K‐poisoning NH3‐SCR Reaction mechanism
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TiO_2-ZrO_2制备条件对B_2O_3/TiO_2-ZrO_2催化环己酮肟气相Beckmann重排反应的影响 认领 引用 被引量：2
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作者 毛东森 陈庆龄 卢冠忠 《石油化工》 EI CAS 北大核心 2002年第10期783-786,共4页
考察了载体TiO2 -ZrO2 的制备条件对B2 O3/TiO2 -ZrO2 催化环己酮肟气相Beckmann重排反应性能的影响 ,确定较佳的制备条件 :分别以四氯化钛和氧氯化锆为钛源和锆源 ,采用反滴法将原料慢慢地滴加到沉淀剂氨水溶液中 ,沉淀终点的pH等于 9 ... 考察了载体TiO2 -ZrO2 的制备条件对B2 O3/TiO2 -ZrO2 催化环己酮肟气相Beckmann重排反应性能的影响 ,确定较佳的制备条件 :分别以四氯化钛和氧氯化锆为钛源和锆源 ,采用反滴法将原料慢慢地滴加到沉淀剂氨水溶液中 ,沉淀终点的pH等于 9 0 ,沉淀的老化温度 2 5℃ ,焙烧温度 5 0 0℃。环己酮肟的转化率和己内酰胺的选择性分别高达 99 7%和 97 0 %。 展开更多
关键词 B2O3/TiO2-ZrO2催化剂 环己酮肟 气相Beckmann重排反应 制备条件
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复合固体超强酸催化剂SO_42--MoO_3-ZrO_2 的研究——Ⅱ . 酯化催化性能的研究 认领 引用 被引量：1
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作者 黄碧纯 黄仲涛 《华南理工大学学报（自然科学版）》 EI CAS 北大核心 1997年第8期121-126,共6页
以乙酸和丁醇的酯化为探针反应，着重考察了制备条件对SO2－4MoO3ZrO2超强酸催化剂催化活性的影响；考察了催化剂的使用寿命。结果表明，MoO3含量和焙烧温度对催化活性有显著影响，而H2SO4浓度对催化活性的影响却不明显；催化剂具... 以乙酸和丁醇的酯化为探针反应，着重考察了制备条件对SO2－4MoO3ZrO2超强酸催化剂催化活性的影响；考察了催化剂的使用寿命。结果表明，MoO3含量和焙烧温度对催化活性有显著影响，而H2SO4浓度对催化活性的影响却不明显；催化剂具有较好的稳定性及使用寿命。另外，用XRD、FTIR等分析方法对催化剂进行了物性测试。 展开更多
关键词 SO_42--MoO_3-ZrO_2 固体超强酸 酯化 催化剂 活性
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Hydrothermal Synthesis, Characterization and Catalytic Properties of Nanoporous MoO_ 3/ZrO_ 2 Mixed Oxide 认领 引用 被引量：3
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作者 SHI Wei LIU Hai-yan REN Dong-mei MA Zhuo SUN Wen-dong 《Chemical Research in Chinese Universities》 SCIE EI CAS 2006年第3期364-367,共4页
A nanoporous MoO3/ZrO2 mixed oxide was hydrothermally synthesized by hydrolyzing zirconium isopropoxide in the presence of a cationic surfactant, eetyltrimethylammonium bromide（CTAB）. The crystal structure and the a... A nanoporous MoO3/ZrO2 mixed oxide was hydrothermally synthesized by hydrolyzing zirconium isopropoxide in the presence of a cationic surfactant, eetyltrimethylammonium bromide（CTAB）. The crystal structure and the acidity of the obtained nanoporous MoO3/ZrO2 mixed oxide were determined by means of XRD, N2 adsorption-desorption and NH3-TPD, respectively. The isobutane/butene alkylation over the MoO3/ZrO2 catalyst was carried out in a fixed bed reactor. The results reveal that ZrO2 in MoO3/ZrO2 exists mainly in the tetragonal phase, and the catalyst samples possess large specific surface areas as well as moderate acidity for isobutane/butene alkylation. Compared with samples prepared by impregnation and sol-gel processes, MoO3/ZrO2 mixed oxide samples prepared in this work have a better catalytic activity. 展开更多
关键词 MoO3/ZrO2 Hydrothermal synthesis Solid acid catalyst Alkylation
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High CO methanation activity on zirconia-supported molybdenum sulfide catalyst 认领 引用 被引量：15
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作者 Zhenhua Li Ye Tian +2 位作者 Jia He Baowei Wang Xinbin Ma 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2014年第5期625-632,共8页
In this study, different methods were used to prepare MoO3/ZrO2 catalysts for sulfur resistant methanation reaction. It was found that MoO3/ZrO2 catalyst prepared by one-step co-precipitation method achieved high meth... In this study, different methods were used to prepare MoO3/ZrO2 catalysts for sulfur resistant methanation reaction. It was found that MoO3/ZrO2 catalyst prepared by one-step co-precipitation method achieved high methanation performance. CO conversion could reach up to 90% on 25 wt% MoO3/ZrO2 catalyst, much higher than that on the conventional 25 wt% MoO3/Al2O3 catalyst. The Mo-based catalysts were characterized by XRF, XRD, Raman, BET, TEM and H2-TPR etc. It was found that MoO3 particles were highly dispersed on ZrO2 support for 25 wt% MoO3/ZrO2 catalyst prepared at 65-85℃ because of its relatively larger pore size, which contributed to a high CO conversion. Meanwhile, when MoO3 loading exceeded the monolayer coverage, the formed crystalline MoO3 and ZrM020g might block the micropores of the catalyst and make the methanation activity declined. These results are useful for preparing highly efficient catalyst for CO methanation process. 展开更多
关键词 MoO3/ZrO2 catalyst one-step co-precipitation method sulfur resistant methanation high CO conversion
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Role of Nanosized Zirconia on the Properties of Cu/Ga2O3/ZrO2 Catalysts for Methanol Synthesis 认领 引用 被引量：4
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作者 刘欣梅 阎子峰 逯高清 《Chinese Journal of Chemistry》 SCIE CAS 2006年第2期172-176,共5页
The introduction of mesoporous nanosize zirconia to the catalyst for methanol synthesis dedicates the nanosized catalyst and mesoporous duplicated properties. The catalyst bears the larger surface area, larger mesopor... The introduction of mesoporous nanosize zirconia to the catalyst for methanol synthesis dedicates the nanosized catalyst and mesoporous duplicated properties. The catalyst bears the larger surface area, larger mesoporous volume and more uniform diameter, more surface metal atoms and oxygen vacancies than the catalyst prepared with the conventional coprecipitation method. The modification of microstructure and electronic effect could result in the change of the reduced chemical state and decrease of reducuction temperature of copper, donating the higher activity and methanol selectivity to the catalyst. The results of methanol synthesis demonstrate that the Cu^＋ is the optimum active site. Also, the interaction between the copper and zirconia shows the synergistic effect to fulfil the methanol synthesis. 展开更多
关键词 nanosize zirconia Cu/Ga2O3/ZrO2 methanol synthesis catalyst
成型工艺条件对铈锆铝复合载体性能的影响 认领 引用
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作者 堵俊俊 刘鹏翔 +1 位作者 王靖超 高珠 《工业催化》 CAS 2019年第9期48-53,共6页
采用压缩成型法对铈锆铝复合载体进行了放大制备,考察放大制备过程中造粒粉含水量、成型压力、焙烧温度等成型工艺条件对载体机械强度、吸水量、密度、织构性质及晶相的影响。结果表明,造粒粉含水量是影响颗粒成型的主要因素,含水量过高... 采用压缩成型法对铈锆铝复合载体进行了放大制备,考察放大制备过程中造粒粉含水量、成型压力、焙烧温度等成型工艺条件对载体机械强度、吸水量、密度、织构性质及晶相的影响。结果表明,造粒粉含水量是影响颗粒成型的主要因素,含水量过高,颗粒不能成型或容易层裂;成型压力是影响载体强度、吸水量、密度等机械性能的主要影响因素,适宜的成型压力有助于获得各项机械性能均衡的载体;焙烧温度是影响载体比表面积及晶相结构的关键因素。结合生产要求确定最佳工艺条件为造粒粉含水量为15%,半成品强度(7~9)N·mm-1,焙烧温度(800~900)℃。 展开更多
关键词 催化剂工程 铈锆铝复合载体 压缩成型 含水量 成型压力 焙烧温度
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