摘要
采用浸渍法制备了负载型Co基催化剂,并在介质阻挡放电低温等离子体反应器中研究了其对CO2加氢转化生成低碳烃反应的催化性能,考察了载体、Co负载量,以及催化助剂对催化剂性能的影响,探讨了催化剂活性相、等离子体与催化剂的协同作用机理,分析了在等离子体体系中CO2加氢制低碳烃可能的反应路径。结果表明,在介质阻挡放电反应器中,等离子体与Co基催化剂具有显著协同作用,在常压、低温下,CO2加氢可生成一定量的C2~C4低碳烃。以Co质量分数为15%的Co/ZSM-5为催化剂时,CO2转化率达45.0%;C2~C4选择性为13.7%。催化助剂Ni的加入可以进一步提高CO2的转化率和C2~C4的选择性。当Ni-Co/ZSM-5催化剂中m(Co)/m(Ni)为4∶1时,CO2转化率达52.3%,C2~C4选择性达17.9%。
Supported Co catalysts were synthesized by incipient-wetness impregnation method,and their catalytic performance for CO2 hydrogenation to light hydrocarbons with the synergy of plasma was evaluated in a dielectric-barrier discharges(DBD)reactor.Effects of carriers,metal loading amounts and co-catalyst on the catalytic performance were investigated.Furthermore,the synergic effects among active phase of cobalt catalyst,plasma and catalysis were studied,and the reaction network of CO2 hydrogenation in a DBD reactor was proposed.In the DBD reactor,significant synergetic effect was observed between non-thermal plasma and cobalt catalysts for CO2 hydrogenation to light hydrocarbons,and this makes it possible to hydrogenate CO2 at a low temperature and atmospheric pressure.For Co/ZSM-5 with 15% mass fraction cobalt,the total selectivity of C2-C4 hydrocarbons was 13.7% with a CO2 conversion 45.0%.Addition of Ni as a promoter led to obvious improvement in both CO2 conversion and C 2-C 4 selectivity.At the optimal mass ratio of Co to Ni(4∶1),CO2 conversion can be 52.3%,and the selectivity of C2-C4 hydrocarbons is 17.9%.
作者
兰俐颖
曾傲楠
王安杰
王瑶
LAN Liying;ZENG Aonan;WANG Anjie;WANG Yao(School of Chemical Engineering,Dalian University of Technology,Dalian 116023,China)
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2020年第2期293-300,共8页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(21473017,21603024,21673029,U1508205)
国际合作基金项目(2016YFE0109800)资助。
关键词
二氧化碳
加氢
低碳烃
催化剂
等离子体
协同作用
carbon dioxide
hydrogenation
lower hydrocarbons
catalyst
plasma
synergy
