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SiO2助剂对CuO-ZnO/HZSM-5催化CO2加氢制DME性能的影响
引用本文:杜杰,张雅静,张宇,王康军,王琦,吴静.SiO2助剂对CuO-ZnO/HZSM-5催化CO2加氢制DME性能的影响[J].分子催化,2016,30(4):346-353.
作者姓名:杜杰  张雅静  张宇  王康军  王琦  吴静
作者单位:沈阳化工大学 化学工程学院,辽宁 沈阳,110142
基金项目:国家自然科学基金项目(No. 51301114, 21203125), 辽宁省高等学校优秀人才支持计划项目LNET (LJQ2013044), 辽宁省自然科学基金(2015020649)
摘    要:采用均匀沉淀法制备了不同 SiO2含量的 CuO-ZnO 作为 CO2加氢合成甲醇的活性组分,接着采用研磨法将其与 HZSM-5分子筛均匀混合形成双功能催化剂,考察了不同 SiO2含量催化剂在 CO2加氢合成二甲醚反应中的催化性能。通过 XRD、N2等温吸附脱附、H2-TPR、NH3-TPD、N2 O 滴定对催化剂结构进行表征,研究了 SiO2含量对催化剂结构及表面酸性的影响。结构表征表明助剂 SiO2的加入增加了催化剂的比表面积,提高了催化剂的还原性,使催化剂的表面酸性较为合适,同时在一定程度上能够抑制催化剂活性组分的聚集,从而有效促进了催化剂的催化活性。

关 键 词:二甲醚  二氧化碳加氢  SiO2助剂

Effect of SiO2 Promoter on Performance of CuO-ZnO /HZSM-5 Catalysts for Synthesis of DME from CO2 Hydrogenation
Institution:Shenyang University of Chemical Technology
Abstract:A series of CuO-ZnO catalysts with various SiO2 content were synthesized by homogeneous precipitation method,then mixed with HZSM-5 zeolite by grinding method and form a bifunctional catalyst.The catalytic per-formances of catalysts for the synthesis of dimethyl ether from CO2 hydrogenation were tested.XRD,N2 isothermal adsorption-desorption,H2-TPR and NH3-TPD and N2 O titration were employed to investigate the structure of the catalyst.The effect of SiO2 content on the structure and surface acidity of the catalyst was studied.The result showed that the addition of promoter SiO2 increased the specific surface area and improved the reduction ability,in addition,aggregation of the active components can be decreased,thus promoting the catalytic activity.
Keywords:dimethyl ether  CO2 hydrogenation  promoter SiO2
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