Effect of a potassium promoter on the Fischer-Tropsch synthesis of light olefins over iron carbide catalysts encapsulated in graphene-like carbon

doi:10.1039/c9cy00403c

GIEC OpenIR

	Effect of a potassium promoter on the Fischer-Tropsch synthesis of light olefins over iron carbide catalysts encapsulated in graphene-like carbon
	Tian, Zhipeng 1,2,3; Wang, Chenguang 1; Yue, Jun 2; Zhang, Xinghua1 ; Ma, Longlong1
	2019-06-07
发表期刊	CATALYSIS SCIENCE & TECHNOLOGY
ISSN	2044-4753
卷号	9 期号:11 页码:2728-2741
通讯作者	Wang, Chenguang(wangcg@ms.giec.ac.cn)
摘要	Iron carbide catalysts encapsulated in graphene-like carbon were synthesized via a facile method by pyrolysis of an iron-glucose precursor. Different amounts of potassium (0-5 wt%) were in situ doped into the catalyst simultaneously. Glucose played a role both as the precursor to form a carbon support and a reducing agent that reduced iron oxides to.-Fe3C during the catalyst preparation..-Fe3C underwent a phase transformation to.-Fe5C2 as the active phase in Fischer-Tropsch synthesis. Characterization of the structural and chemical properties of the prepared catalysts revealed a core-shell structure with iron carbides enwrapped by several graphene-like layers. The addition of a potassium promoter increased the amount of defects on graphene-like layers and facilitated the formation of iron carbides during the catalyst preparation. Fischer-Tropsch synthesis under typical reaction conditions (320 degrees C, 20 bar, H2/CO = 1, GHSV = 15000 ml gcat(-1) h(-1)) was carried out in a fixed bed reactor. A higher light olefin selectivity was obtained than that on common iron catalysts, probably because of the electron-rich surfaces of the prepared catalysts that made it hard for hydrogen to hydrogenate the unsaturated intermediates. A volcano-like evolution of light olefin selectivity was observed on the catalysts with different contents of K, and the highest olefin selectivity reached 41.9% on the 2K-Fe3C@ C catalyst (i. e., doped with 2 wt% of K). The induction period of the catalyst was shortened by K addition. No drastic changes in the catalyst morphology and performance during 100 h time on stream can be ascribed to the protection of graphene-like carbon layers that prevented the supported iron particles from migration and aggregation under harsh conditions in FischerTropsch synthesis.
DOI	10.1039/c9cy00403c
关键词[WOS]	ACTIVATED-CARBON ; NANOPARTICLES ; NANOTUBES ; SUPPORT ; HYDROCARBONS ; REDUCTION ; SURFACE ; SYNGAS ; GAS ; FABRICATION
收录类别	SCI
语种	英语
资助项目	Natural Science Foundation of China[51776206] ; CAS Pioneer Hundred Talents Program ; UCAS Joint PhD Training Program
WOS研究方向	Chemistry
项目资助者	Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program ; UCAS Joint PhD Training Program
WOS类目	Chemistry, Physical
WOS记录号	WOS:000470710300026
出版者	ROYAL SOC CHEMISTRY
引用统计	被引频次：93[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/25188
专题	中国科学院广州能源研究所
通讯作者	Wang, Chenguang
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangdong Prov Key Lab New & Renewable Energy Res, CAS Key Lab Renewable Energy, Guangzhou 510640, Peoples R China 2.Univ Groningen, Dept Chem Engn, Engn & Technol Inst Groningen, Nijenborgh 4, NL-9747 AG Groningen, Netherlands 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	Tian, Zhipeng,Wang, Chenguang,Yue, Jun,et al. Effect of a potassium promoter on the Fischer-Tropsch synthesis of light olefins over iron carbide catalysts encapsulated in graphene-like carbon[J]. CATALYSIS SCIENCE & TECHNOLOGY,2019,9(11):2728-2741.
APA	Tian, Zhipeng,Wang, Chenguang,Yue, Jun,Zhang, Xinghua,&Ma, Longlong.(2019).Effect of a potassium promoter on the Fischer-Tropsch synthesis of light olefins over iron carbide catalysts encapsulated in graphene-like carbon.CATALYSIS SCIENCE & TECHNOLOGY,9(11),2728-2741.
MLA	Tian, Zhipeng,et al."Effect of a potassium promoter on the Fischer-Tropsch synthesis of light olefins over iron carbide catalysts encapsulated in graphene-like carbon".CATALYSIS SCIENCE & TECHNOLOGY 9.11(2019):2728-2741.