摘要
以尿素为沉淀剂,采用均匀共沉淀法合成CO_2加氢制清洁能源DME的双功能催化剂CuO-ZnO-ZrO_2/HZSM-5,用XRD、BET、H_2-TPR、NH_3-TPD、SEM等技术对其进行表征,考察了不同沉淀剂量对催化剂结构及催化性能的影响。结果表明,适量的沉淀剂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,同时使催化剂具有较小的CuO晶粒,从而有效提高了催化剂的催化活性。在压力3.0MPa、温度260℃、空速1500h^(-1)的反应条件下,当尿素加入量为化学计量比的400%时催化效果最佳,CO_2单程转化率为20.9%,DME选择性、收率分别为50.5%和10.6%。
CuO-ZnO-ZrO2/HZSM-5 bifunctional catalysts for synthesis of dimethyl ether （DME） by CO2 hydrogenation were prepared by homogeneous coprecipitation with urea as precipitant and characterized by XRD, BET, H2-TPR, NH3-TPD and SEM. The effect of urea dosage on the structure and catalytic performance of the catalysts was investigated. The results showed that the proper amount of precipitant increased the specific surface area of the catalyst, improved the reducibility of the catalyst, made the surface acidity of the catalyst more suitable, and provided the catalyst with smaller CuO grains, thereby effectively increasing the catalytic activity of the catalyst. Under the reaction conditions of pressure of 3.0 MPa, temperature of 260℃ and space velocity of 1500h-1, the best catalytic effect is achieved over the catalyst prepared by using 4 times stoichiometric amount of urea, and the conversion of CO2 and the selectivity and yield of DME were 20.9%, 50.5% and 10.6%, respectively.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2018年第1期23-28,共6页
Natural Gas Chemical Industry
基金
国家自然科学基金项目(No.51301114
21203125)
辽宁省自然科学基金(201602598
2015020649)
辽宁省高等学校优秀人才支持计划项目LNET(LJQ2013044)
