| 张雅静,李德豹,姜丹,张素娟,王康军,吴静.助剂Mn对CO2加氢制二甲醚CuO-ZnO-ZrO2/HZSM-5催化剂的结构和性能影响[J].分子催化,2014,(4):344-350 |
| 助剂Mn对CO2加氢制二甲醚CuO-ZnO-ZrO2/HZSM-5催化剂的结构和性能影响 |
| Effect of Mn Promoter on Structure and properties of Mn Modified CuO-ZnO-ZrO2 /HZSM-5 Catalysts for Synthesis of Dimethyl Ether from CO2 Hydrogenation |
| 投稿时间：2014-04-03 修订日期：2014-06-18 |
| DOI： |
| 中文关键词: 助剂 二甲醚 二氧化碳加氢 CuO-ZnO-ZrO2/ HZSM-5 |
| 英文关键词:CO2 hydrogenation CuO-ZnO-ZrO2/ HZSM-5 catalyst, MnO2 promoter. |
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| 摘要点击次数: 2079 |
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| 中文摘要: |
| 以无水乙醇为溶剂，草酸为沉淀剂，采用悬浮共沉淀法，一步合成Mn改性的CuO-ZnO-ZrO2 / HZSM-5双功能催化剂。并研究了该催化剂在CO2加氢合成二甲醚反应中的催化性能，考察了助剂锰的添加量对催化剂性能的影响，并采用XRD、BET、TPR、 NH3-TPD和XPS对催化剂结构进行表征。结果表明，双功能催化剂性能与助剂锰的添加量有密切联系, 适量锰的加入可提供合适的表面酸性，提高二甲醚的选择性，降低副产物CO 的选择性。表征结果表明，加入Mn可以促进CuO的分散, 并降低CuO的还原温度，增加催化剂的比表面积，提高Cu+/Cu0比，从而能促进CO2 的转化，有利于提高催化剂的活性。 |
| 英文摘要: |
| Abstract: Mn modified CuO-ZnO-ZrO2/HZSM-5 catalysts for dimethyl ether synthesis from hydrogenation of CO2 were directly prepared by parallel-flow-coprecipitation method, using anhydrous ethanol as solvent, and oxalic acid as precipitator. The catalytic performance of the catalyst was studied. The influence of Mn content was investigated. XRD, BET, TPR and NH3-TPD were employed to investigate the surface structure and performance of the catalysts. The results indicated 1% MnOx modified catalyst could provide a suitable surface acidity，exhibited higher DME selectivity and lower CO selectivity since Mn addition can promote disperse of ZnO and CuO, decrease the reduce temperature of CuO, increase the specific surface area and therefore promote the conversion of CO2 and improve the activity of the catalyst. |
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