稀土Ce对CuCo氧化物催化剂结构与性能的影响

采用超声辐射条件下的反相共沉淀法制备CO加氢合成低碳醇用CuCo催化剂,研究稀土助剂Ce对CuCo氧化物催化剂结构与性能的影响,并借助X射线衍射、N2吸附等温线和程序升温分析技术对催化剂进行表征.结果表明,Ce的加入使催化剂材料晶粒细化,显著改善样品的还原性能,增加催化剂的比表面积,促进合成醇活性位的形成,因而明显改善催化剂的活性与选择性.

Effect of Ce Addition on the Structure and Properties of CuCo Oxide Catalyst

CuCo catalysts used for synthesis of low-carbon alcohol by CO+H2 were prepared by the reverse coprecipitation method under the ultrasound irradiation. The influence of rare earth Ce assistant on the structure and catalytic properties was investigated. The experimental catalysts were extensively characterized by XRD, BET, TPR and TPD techniques. It was found that after the addition of rare earth Ce, the crystallite size of the catalytic material was decreased, the reducibility was enhanced, the specific surface area was increased and the formation of the active sites for alcohols was improved significantly. Therefore, the activity and selectivity of the rare earth promoted catalyst were improved remarkably.