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发布时间：2019-03-12

论文类型：期刊论文

发表时间：2017-05-01

发表刊物：JOURNAL OF CO2 UTILIZATION

收录刊物：Scopus、EI、SCIE

卷号：19

页面范围：202-208

ISSN号：2212-9820

关键字：CO2 hydrogenation; Alumina; Pore size; Particle size

摘要：The effect of support pore size of FeK/Al2O3 catalysts on the catalytic performance in CO2 hydrogenation reaction was investigated. A total of 8 iron-based catalysts supported on alumina with different pore size were prepared by incipient wetness impregnation where the amount of Fe and K were fixed at 15 and 10 wt%, respectively. N-2 adsorption/desorption, XRD, TPR and PZC were used to characterize the supports and catalysts. The results show that the support pore size impacts the size of Fe2O3 particles formed in the catalyst; increasing pore size of Al2O3 supports led to increased size of Fe2O3 particles formed in the pores. Catalyst pore sizes of 7-10 nm and the corresponding Fe2O3 particle sizes of 5-8 nm were the most active for CO2 hydrogenation to hydrocarbons. Outside this range, larger pore size further decrease the iron dispersion and reduce the number of active sites; smaller pore size is not favorable on account of the too small Fe2O3 particle sizes and lower reducibility of the small particle.