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复合载体负载型催化剂制备及其微波辅助催化氧化甲苯性能试验 被引量:4
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作者 杨全 张浩 卜龙利 《西安建筑科技大学学报(自然科学版)》 CSCD 北大核心 2014年第1期131-136,共6页
将吸附材料分子筛粉末、吸波材料碳化硅粉末以及催化活性组分铜(Cu)、锰(Mn)、铈(Ce)盐溶液完全混合,通过制粒、煅烧后制得复合载体负载型催化剂;微波辐照条件下,应用该催化剂进行了甲苯废气的催化氧化性能试验研究.研究表明,复合载体... 将吸附材料分子筛粉末、吸波材料碳化硅粉末以及催化活性组分铜(Cu)、锰(Mn)、铈(Ce)盐溶液完全混合,通过制粒、煅烧后制得复合载体负载型催化剂;微波辐照条件下,应用该催化剂进行了甲苯废气的催化氧化性能试验研究.研究表明,复合载体负载型催化剂的优化制备条件为:高岭土为粘合剂,掺入3%的碳化硅,铜锰质量比为1︰1(各5%负载量),铈的掺杂量为1.67%,焙烧温度为500℃,焙烧时间为8h.反应温度210℃下,优化制备的复合载体催化剂催化氧化甲苯的转化率达95%,表现出良好的低温活性和催化氧化性能. 展开更多
关键词 复合载体负载铜-锰-铈催化剂 微波加热 催化氧化 甲苯
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SiO_2为载体负载Pd催化加氢合成2,4-二氟苯胺的研究 被引量:2
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作者 袁加程 《化学世界》 CAS CSCD 北大核心 2009年第1期44-46,50,共4页
用浸渍法制得0.2%铁元素改性的SiO2为载体的负载5%Pd催化剂对2,4-二氟硝基苯常压催化加氢,用沸点、元素分析I、R和1H NMR对它的结构进行了表征,证明为目标产物2,4-二氟苯胺;确定优化工艺条件为:反应物0.1 mol,催化剂0.26 g,80 mL无水乙... 用浸渍法制得0.2%铁元素改性的SiO2为载体的负载5%Pd催化剂对2,4-二氟硝基苯常压催化加氢,用沸点、元素分析I、R和1H NMR对它的结构进行了表征,证明为目标产物2,4-二氟苯胺;确定优化工艺条件为:反应物0.1 mol,催化剂0.26 g,80 mL无水乙醇作溶剂,反应温度为50℃,0.1 MPa下氢化反应2 h,产率为97.9%,产物的纯度达98.4%。 展开更多
关键词 SiO2为载体负载Pd催化剂 2 4-二氟硝基苯 2 4-二氟苯胺 催化加氢 常压
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SiO_2为载体负载Pd催化加氢合成3-三氟甲基苯胺 被引量:1
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作者 袁加程 《化学世界》 CAS CSCD 北大核心 2014年第6期352-354,共3页
用浸渍法制得0.2%铁元素改性的SiO2为载体负载5%Pd催化剂,用于3-硝基三氟甲苯常压催化加氢合成3-三氟甲基苯胺,用沸点、元素分析、IR和1 H NMR对它的结构表征为目标产物;确定优化工艺条件为:0.1mol硝基物,0.26g催化剂,80mL无水乙醇作溶... 用浸渍法制得0.2%铁元素改性的SiO2为载体负载5%Pd催化剂,用于3-硝基三氟甲苯常压催化加氢合成3-三氟甲基苯胺,用沸点、元素分析、IR和1 H NMR对它的结构表征为目标产物;确定优化工艺条件为:0.1mol硝基物,0.26g催化剂,80mL无水乙醇作溶剂,反应温度为50℃,0.1MPa下加氢反应3h,收率为97.8%,产物的纯度达98.2%。 展开更多
关键词 SiO2为载体负载Pd催化剂 3-三氟甲基苯胺 催化加氢 常压
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负载型TiO_2/γ-Al_2O_3体系的制备及其表面状态表征 被引量:19
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作者 朱永法 桂琳琳 唐有祺 《Chinese Journal of Catalysis》 SCIE CAS CSCD 北大核心 1989年第2期118-122,共5页
用TiCl_4,AlCl_3混胶法制备了TiO_2/γ-Al_2O_3负载型载体。发现该载体具有优良的孔结构。XRD,XPS的研究发现,随着TiO_2负载量的增加,TiO_2/γ-Al_2O_3负载型载体存在着四种分散状态和表面结构。ISS实验还发现γ-Al_2O_3表面的能量中心... 用TiCl_4,AlCl_3混胶法制备了TiO_2/γ-Al_2O_3负载型载体。发现该载体具有优良的孔结构。XRD,XPS的研究发现,随着TiO_2负载量的增加,TiO_2/γ-Al_2O_3负载型载体存在着四种分散状态和表面结构。ISS实验还发现γ-Al_2O_3表面的能量中心是不均匀的,有强位作用中心和弱位作用中心,TiO_2在γ-Al_2O_3表面上分散总是优先结合在强位作用中心上。TEM的研究发现TiO_2/γ-Al_2O_3载体具有两种微观结构。 展开更多
关键词 TiO2/γ-A2O3 负载载体
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沸石载体催化剂研制及其催化臭氧氧化染料废水的研究 被引量:12
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作者 邵琴 金腊华 +1 位作者 刘玉兵 蒋娜莎 《环境污染与防治》 CAS CSCD 北大核心 2010年第12期59-62,66,共5页
以沸石为载体负载不同金属氧化物来制备催化剂,通过试验分析该催化剂催化臭氧氧化染料废水的效果及其影响因素。结果表明:(1)沸石对染料废水的吸附作用很小,总有机碳(TOC)去除率基本维持在3.2%左右,对于后期的试验可以忽略其影响。(2)... 以沸石为载体负载不同金属氧化物来制备催化剂,通过试验分析该催化剂催化臭氧氧化染料废水的效果及其影响因素。结果表明:(1)沸石对染料废水的吸附作用很小,总有机碳(TOC)去除率基本维持在3.2%左右,对于后期的试验可以忽略其影响。(2)以沸石作为载体制得的MnO2、Fe2O3、ZnO、CuO负载型催化剂(分别简写为MnO2/沸石、Fe2O3/沸石、ZnO/沸石、CuO/沸石),对臭氧氧化反应均有催化作用,其催化效果依次为MnO2/沸石>Fe2O3/沸石>ZnO/沸石>CuO/沸石。同时,MnO2/沸石的重复使用率高。(3)MnO2/沸石催化臭氧氧化效率及重复使用率均优于以活性炭为载体的MnO2负载型催化剂。(4)臭氧氧化和MnO2/沸石催化臭氧氧化对染料的脱色率基本一致。MnO2/沸石催化臭氧氧化的TOC去除率比臭氧氧化提高较多,对染料废水有很好的处理效果。(5)以沸石为载体制得的负载型催化剂催化臭氧氧化实际染料废水的处理效果较好,具有较高的实用价值。 展开更多
关键词 催化臭氧氧化 沸石载体负载型催化剂 染料废水
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KF改性负载铜催化剂在Heck反应上的应用 被引量:1
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作者 张胜建 应丽艳 张洪 《应用化学》 CAS CSCD 北大核心 2010年第5期549-552,共4页
KF水溶液浸渍MgO或ZnO载体为改性载体制备了负载铜催化剂,以卤苯与丙烯酸正丁酯的反应为模型,考察了对Heck反应的催化性能。结果表明,对碘苯与丙烯酸正丁酯的Heck反应的催化性能,未改性催化剂基本没有活性,而改性后,10%Cu/5%KF/ZnO、20%... KF水溶液浸渍MgO或ZnO载体为改性载体制备了负载铜催化剂,以卤苯与丙烯酸正丁酯的反应为模型,考察了对Heck反应的催化性能。结果表明,对碘苯与丙烯酸正丁酯的Heck反应的催化性能,未改性催化剂基本没有活性,而改性后,10%Cu/5%KF/ZnO、20%Cu/10%KF/ZnO催化剂的催化转化率为100%和反式异构体的选择性为98%以上。改性催化剂10%Cu/5%KF/ZnO对于对-硝基溴苯与丙烯酸正丁酯的Heck反应的转化率为34.3%。该催化剂重复使用4次仍有较高催化活性,如20%Cu/10%KF/ZnO为65.4%。催化剂的XRD分析表明,改性剂的加入可提高催化剂表面CuO的含量而提高催化性能。 展开更多
关键词 HECK反应 改性载体负载铜催化剂 丙烯酸正丁酯 碘苯 KF
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附载光催化剂TiO_2/活性炭光催化氧化NO_2^-的研究 被引量:1
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作者 张竟成 《淮北煤师院学报(自然科学版)》 2002年第1期48-50,共3页
探讨了光催化剂TiO2/C的制备条件和不同制备条件对NO2-的光催化氧化效果.研究表明,制备TiO2/C的最佳条件为:Ti(OCH3)4的用量为10ml,附载光催化剂样品在400℃下焙烧5h,TiO2/C的用量为0.5g时光催化效果最好.
关键词 负载光催化剂 TiO/活性炭 光催化氮化 NO2^- 负载载体 负载 二氧化钛 亚硝酸根
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复合载体负载型催化剂制备UHMWPE动力学行为 被引量:1
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作者 司荣双 孙红亮 +2 位作者 王烨 范江洋 李国兵 《化学工业与工程》 CAS CSCD 2016年第5期33-37,共5页
研究了采用氯化镁和硅胶复合载体负载Mg-Ti型催化剂催化乙烯聚合的性能和动力学行为,考察了聚合温度、时间、压力、助催化剂对催化剂性能的影响,以及链转移反应在其中所起到的作用。结果表明,温度对聚乙烯的相对分子质量影响最大,乙烯... 研究了采用氯化镁和硅胶复合载体负载Mg-Ti型催化剂催化乙烯聚合的性能和动力学行为,考察了聚合温度、时间、压力、助催化剂对催化剂性能的影响,以及链转移反应在其中所起到的作用。结果表明,温度对聚乙烯的相对分子质量影响最大,乙烯分压和聚合温度对催化剂的活性有明显影响,存在一个使催化剂高活性的最适宜铝钛物质的量之比。 展开更多
关键词 复合载体负载型催化剂 超高相对分子质量聚乙烯 制备 黏均相对分子质量
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Effects of the Supports on Activity of Supported Nickel Catalysts for Hydrogenation of m-Dinitrobenzene to m-Phenylenediamine 被引量:10
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作者 刘迎新 陈吉祥 张继炎 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2007年第1期63-67,共5页
The hydrogenation of m-dinitrobenzene to m-phenylenediamine in liquid phase was studied with the nickel catalysts supported on SiO2, TiO2, γ-Al2O3, MgO and diatomite carders. Based on the experiments of X-ray diffrac... The hydrogenation of m-dinitrobenzene to m-phenylenediamine in liquid phase was studied with the nickel catalysts supported on SiO2, TiO2, γ-Al2O3, MgO and diatomite carders. Based on the experiments of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), temperature-programmed desorption of hydrogen (H2-TPD) and activity evaluation, the physico-chemical and catalytic properties of the catalysts were investigated. Among the catalysts tested, the SiO2 supported nickel catalyst showed the highest activity and selectivity towards m-phenylenediamine, over which 97.3% m-dinitrobenzene conversion and 95.1% m-phenylenediamine yield were obtained at 373K under hydrogen pressure of 2.6MPa after reaction for 6 h when using ethanol as solvent. Although TiO2 and diatomite supported nickel catalysts also presented high activity, they had lower selectivity towards m-phenylenediamine. As for γ-Al2O3 and MgO supported catalysts were almost inactive for the object reaction. It was shown that both the activity and selectivity of the catalysts were strongly depended on the interaction between nickel and the support. The higher activities of Ni/SiO2, Ni/TiO2 and Ni/diatomite could be attributed to the weaker metal-support interaction, on which Ni species presented as crystallized Ni metal particles. On the other hand, there existed strong metal-support interaction in Ni/MgO and Ni γ-Al2O3, which causes these catalysts more difficult to be reduced and the availability of Ni active sites decreased, resulting in their low catalytic activity. 展开更多
关键词 HYDROGENATION M-PHENYLENEDIAMINE M-DINITROBENZENE supported nickel catalyst metal-support interaction
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Support effect of the supported ceria-based catalysts during NH_3-SCR reaction 被引量:17
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作者 Xiaojiang Yao Li Chen +3 位作者 Tingting Kong Shimin Ding Qiong Luo Fumo Yang 《Chinese Journal of Catalysis》 CSCD 北大核心 2017年第8期1423-1430,共8页
To investigate how the physicochemical properties and NH3‐selective catalytic reduction(NH3‐SCR)performance of supported ceria‐based catalysts are influenced as a function of support type,a series of CeO2/SiO2,CeO2... To investigate how the physicochemical properties and NH3‐selective catalytic reduction(NH3‐SCR)performance of supported ceria‐based catalysts are influenced as a function of support type,a series of CeO2/SiO2,CeO2/γ‐Al2O3,CeO2/ZrO2,and CeO2/TiO2catalysts were prepared.The physicochemical properties were probed by means of X‐ray diffraction,Raman spectroscopy,Brunauer‐Emmett‐Teller surface area measurements,X‐ray photoelectron spectroscopy,H2‐temperature programmed reduction,and NH3‐temperature programmed desorption.Furthermore,the supported ceria‐based catalysts'catalytic performance and H2O+SO2tolerance were evaluated by the NH3‐SCR model reaction.The results indicate that out of the supported ceria‐based catalysts studied,the CeO2/γ‐Al2O3catalyst exhibits the highest catalytic activity as a result of having a high relative Ce3+/Ce4+ratio,optimum reduction behavior,and the largest total acid site concentration.Finally,the CeO2/γ‐Al2O3catalyst also presents excellent H2O+SO2tolerance during the NH3‐SCR process. 展开更多
关键词 Support effect Supported ceria‐based catalyst Reduction behavior Surface acidity Ammonia‐selective catalytic reduction
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MoS2-rGO hybrid architecture as durable support for cathode catalyst in proton exchange membrane fuel cells 被引量:5
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作者 Muhammad Tuoqeer Anwar Xiaohui Yan +6 位作者 Muhammad Rehman Asghar Naveed Husnain Shuiyun Shen Liuxuan Luo Xiaojing Cheng Guanghua Wei Junliang Zhang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第8期1160-1167,共8页
Carbon black is utilized as a conventional electrocatalyst support material for proton exchange membrane fuel cells. However, this support is prone to corrosion under oxidative and harsh environments, thus limiting th... Carbon black is utilized as a conventional electrocatalyst support material for proton exchange membrane fuel cells. However, this support is prone to corrosion under oxidative and harsh environments, thus limiting the durability of the fuel cells. Meanwhile, carbon corrosion would also weaken the linkage between Pt and the support material, which causes Pt agglomeration, and consequently, deterioration of the cell performance. To overcome the drawbacks of a Pt/C electrocatalyst, a hybrid support material comprising molybdenum disulfide and reduced graphene oxide is proposed and synthesized in this study to exploit the graphitic nature of graphene and the availability of the exposed edges of MoS2. TEM results show the uniform dispersion of Pt nanoparticles over the MoS2-rGO surface. Electrochemical measurements indicate higher ECSA retention and better ORR activity after 10000 potential cycles for Pt/MoS2-rGO as compared to Pt/C, demonstrating the improved durability for this hybrid support material. 展开更多
关键词 Fuel cell Hybrid catalyst support Carbon corrosion Supported catalyst Pt-based electrocatalyst
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Catalytic performance enhancement by alloying Pd with Pt on ordered mesoporous manganese oxide for methane combustion 被引量:7
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作者 Peng Xu Zhixing Wu +4 位作者 Jiguang Deng Yuxi Liu Shaohua Xie Guangsheng Guo Hongxing Dai 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第1期92-105,共14页
Ordered mesoporous Mn2O3 (meso‐Mn2O3) and meso‐Mn2O3‐supported Pd, Pt, and Pd‐Pt alloy x(PdyPt)/meso‐Mn2O3; x = (0.10?1.50) wt%; Pd/Pt molar ratio (y) = 4.9?5.1 nanocatalysts were prepared using KIT‐6‐templated... Ordered mesoporous Mn2O3 (meso‐Mn2O3) and meso‐Mn2O3‐supported Pd, Pt, and Pd‐Pt alloy x(PdyPt)/meso‐Mn2O3; x = (0.10?1.50) wt%; Pd/Pt molar ratio (y) = 4.9?5.1 nanocatalysts were prepared using KIT‐6‐templated and poly(vinyl alcohol)‐protected reduction methods, respectively.The meso‐Mn2O3 had a high surface area, i.e., 106 m2/g, and a cubic crystal structure. Noble‐metalnanoparticles (NPs) of size 2.1?2.8 nm were uniformly dispersed on the meso‐Mn2O3 surfaces. AlloyingPd with Pt enhanced the catalytic activity in methane combustion; 1.41(Pd5.1Pt)/meso‐Mn2O3gave the best performance; T10%, T50%, and T90% (the temperatures required for achieving methaneconversions of 10%, 50%, and 90%) were 265, 345, and 425 °C, respectively, at a space velocity of20000 mL/(g?h). The effects of SO2, CO2, H2O, and NO on methane combustion over1.41(Pd5.1Pt)/meso‐Mn2O3 were also examined. We conclude that the good catalytic performance of1.41(Pd5.1Pt)/meso‐Mn2O3 is associated with its high‐quality porous structure, high adsorbed oxygen species concentration, good low‐temperature reducibility, and strong interactions between Pd‐Pt alloy NPs and the meso‐Mn2O3 support. 展开更多
关键词 Ordered mesoporous manganese oxide Pd‐Pt alloy nanoparticle Supported noble metal catalyst Strong metal‐support interaction Methane combustion
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Correlation between catalytic activity of supported gold catalysts for carbon monoxide oxidation and metal–oxygen binding energy of the support metal oxides 被引量:3
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作者 Takashi Fujita Masanori Horikawa +2 位作者 Takashi Takei Tom Murayama Masatake Haruta 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第10期1651-1655,共5页
The effect of a wide variety of metal oxide (MOx) supports has been discussed for CO oxidation on nanoparticulate gold catalysts. By using typical co‐precipitation and deposition–precipitation methods and under id... The effect of a wide variety of metal oxide (MOx) supports has been discussed for CO oxidation on nanoparticulate gold catalysts. By using typical co‐precipitation and deposition–precipitation methods and under identical calcination conditions, supported gold catalysts were prepared on a wide variety of MOx supports, and the temperature for 50%conversion was measured to qualita‐tively evaluate the catalytic activities of these simple MOx and supported Au catalysts. Furthermore, the difference in these temperatures for the simple MOx compared to the supported Au catalysts is plotted against the metal–oxygen binding energies of the support MOx. A clear volcano‐like correla‐tion between the temperature difference and the metal–oxygen binding energies is observed. This correlation suggests that the use of MOx with appropriate metal–oxygen binding energies (300–500 kJ/atom O) greatly improves the catalytic activity of MOx by the deposition of Au NPs. 展开更多
关键词 Metal oxide-supported gold nanoparticle catalyst Support effects Carbon monoxide oxidation Volcano-like correlation Metal-oxygen binding energy
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