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Fischer-Tropsch Synthesis to Lower Olefins over Potassium-Promoted Reduced Graphene Oxide Supported Iron Catalysts
Cheng, Y; Lin, J; Xu, K; Wang, H; Yao, XY; Pei, Y; Yan, SR; Qiao, MH; Zong, BN; Qiao, MH (reprint author), Fudan Univ, Collaborat Innovat Ctr Chem Energy Mat, Dept Chem, Shanghai 200433, Peoples R China.
2016
Source PublicationACS CATALYSIS
ISSN2155-5435
Volume6Issue:1Pages:389—399
Subtype期刊文献
AbstractFischer Tropsch synthesis to lower olefins (FTO) opens up a compact and economical way to the production of lower olefin directly from syngas (CO and H-2) derived from natural gas, coal, or renewable biomass. The present work is dedicated to a systematic study on the effect of K in the reduced graphene oxide (rGO) supported iron catalysts on the catalytic performance in FTO. It is revealed that the activity, expressed as moles of CO converted to hydrocarbons per gram Fe per second (iron time yield to hydrocarbons, termed as FTY), increased first with the content of K, passed through a maximum at 646 mu mol(CO) g(Fe-1) s(-1) over the FeKl/rGO catalyst, and then decreased at higher K contents. Unlike the evolution of the activity, the selectivity to lower olefins increased steadily with K, giving the highest selectivity to lower olefins of 68% and an olefin/paraffin (O/P) ratio of 11 in the C-2-C-4 hydrocarbons over the FeK2/rGO catalyst. The volcanic evolution of the activity is attributed to the interplay among the positive effect of K on the formation of Hagg carbide, the active phase for FTO, and the negative roles of K in increasing the size of Hagg carbide at high content and blocking the active phase by K-induced carbon deposition. The monotonic increase in the selectivity to lower olefins is ascribed to the improved chain-growth ability and surface CO/H-2 ratio in the presence of K, which favorably suppressed the unwanted CH4 production and secondary hydrogenation of lower olefins.
KeywordCarbon Nanotubes Synthesis Gas Direct Conversion Graphite Oxide Light Olefins Active Phase Syngas Hydrogenation Nanoparticles Performance
DOI10.1021/acscatal.5b02024
Indexed BySCI
Language英语
WOS IDWOS:000367706800043
Citation statistics
Cited Times:80[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/25729
Collection中科院上海应用物理研究所2011-2018年
Corresponding AuthorQiao, MH (reprint author), Fudan Univ, Collaborat Innovat Ctr Chem Energy Mat, Dept Chem, Shanghai 200433, Peoples R China.
Recommended Citation
GB/T 7714
Cheng, Y,Lin, J,Xu, K,et al. Fischer-Tropsch Synthesis to Lower Olefins over Potassium-Promoted Reduced Graphene Oxide Supported Iron Catalysts[J]. ACS CATALYSIS,2016,6(1):389—399.
APA Cheng, Y.,Lin, J.,Xu, K.,Wang, H.,Yao, XY.,...&Qiao, MH .(2016).Fischer-Tropsch Synthesis to Lower Olefins over Potassium-Promoted Reduced Graphene Oxide Supported Iron Catalysts.ACS CATALYSIS,6(1),389—399.
MLA Cheng, Y,et al."Fischer-Tropsch Synthesis to Lower Olefins over Potassium-Promoted Reduced Graphene Oxide Supported Iron Catalysts".ACS CATALYSIS 6.1(2016):389—399.
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