论文部分内容阅读
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.
The Mn-modified CuO-ZnO-ZrO2 / HZSM-5 bifunctional catalyst was synthesized in one step using anhydrous ethanol as the solvent and oxalic acid as the precipitating agent by co-precipitation method. The effects of the catalyst on the synthesis of dimethyl ether The effects of the amount of additive Mn on the catalyst performance were investigated, and the structure of the catalyst was characterized by XRD, BET, TPR, NH3-TPD and XPS. The results showed that the catalyst performance was better than that of the additive Mn , The addition of appropriate amount of manganese can provide the suitable surface acidity, increase the selectivity of DME, and reduce the selectivity of byproduct CO.The characterization results show that the addition of Mn can promote the dispersion of CuO and reduce the content of CuO Reduction of temperature, increase the specific surface area of the catalyst, increase Cu / Cu0 ratio, which can promote the conversion of CO2, help to improve the activity of the catalyst.