Carbon induced selective regulation of cobalt-based Fischer-Tropsch   catalysts by ethylene treatment

doi:10.1039/c6fd00194g

CORC > 北京大学 > 化学与分子工程学院

	Carbon induced selective regulation of cobalt-based Fischer-Tropsch catalysts by ethylene treatment
	Zhai, Peng ; Chen, Pei-Pei ; Xie, Jinglin ; Liu, Jin-Xun ; Zhao, Huabo ; Lin, Lili ; Zhao, Bo ; Su, Hai-Yan ; Zhu, Qingjun ; Li, Wei-Xue ; Ma, Ding
刊名	FARADAY DISCUSSIONS
	2017
关键词	DENSITY-FUNCTIONAL THEORY PARTICLE-SIZE REALISTIC CONDITIONS FCC-CO(111) SURFACE NANOPARTICLES GRAPHENE DEACTIVATION DEPOSITION SYNGAS PHASE
DOI	10.1039/c6fd00194g
英文摘要	Various carbonaceous species were controllably deposited on Co/Al2O3 catalysts using ethylene as carbon source during the activation process for Fischer-Tropsch synthesis (FTS). Atomic, polymeric and graphitic carbon were distinguished by Raman spectroscopy, thermoanalysis and temperature programmed hydrogenation. Significant changes occurred in both the catalytic activity and selectivity toward hydrocarbon products after ethylene treatment. The activity decreased along with an increase in CH4 selectivity, at the expense of a remarkable decrease of heavy hydrocarbon production, resulting in enhanced selectivity for the gasoline fraction. In situ XPS experiments show the possible electron transfer from cobalt to carbon and the blockage of metallic cobalt sites, which is responsible for the deactivation of the catalyst. DFT calculations reveal that the activation barrier (Ea) of methane formation decreases by 0.61 eV on the carbon-absorbed Co(111) surface, whereas the Ea of the CH + CH coupling reaction changes unnoticeably. Hydrogenation of CHx to methane becomes the preferable route among the elementary reactions on the Co(111) surface, leading to dramatic changes in the product distribution. Detailed coke-induced deactivation mechanisms of Co-based catalysts during FTS are discussed.; Natural Science Foundation of China [21473003, 21222306, 21473229, 91545121, 21273224, 21321002, 21225315]; 973 Project of China [2013CB933100, 2013CB834603]; SCI(E); ARTICLE; 207-224; 197
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/474197]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Zhai, Peng,Chen, Pei-Pei,Xie, Jinglin,et al. Carbon induced selective regulation of cobalt-based Fischer-Tropsch catalysts by ethylene treatment[J]. FARADAY DISCUSSIONS,2017.
APA	Zhai, Peng.,Chen, Pei-Pei.,Xie, Jinglin.,Liu, Jin-Xun.,Zhao, Huabo.,...&Ma, Ding.(2017).Carbon induced selective regulation of cobalt-based Fischer-Tropsch catalysts by ethylene treatment.FARADAY DISCUSSIONS.
MLA	Zhai, Peng,et al."Carbon induced selective regulation of cobalt-based Fischer-Tropsch catalysts by ethylene treatment".FARADAY DISCUSSIONS (2017).