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Adjusting Hydrocarbon Distribution on the Stabilized Al‐Modified Mesoporous Co 3 O 4 ‐Fe 2 O 3 Bimetal Oxides for CO Hydrogenation
Author(s) -
Ahn ChangIl,
Mo Koo Hyun,
Ha KyoungSu,
Jeon Jonghyun,
Min Cho Jae,
Kim YoungBo,
Young Han Gui,
Lee Jinwon,
Shin ChaeHo,
Wook Bae Jong
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201902152
Subject(s) - bimetal , selectivity , carbide , mesoporous material , materials science , catalysis , fischer–tropsch process , hydrocarbon , metal , chemistry , inorganic chemistry , chemical engineering , organic chemistry , metallurgy , engineering
A higher selectivity to C 2 −C 4 hydrocarbons and clean fuels without significant deactivation during CO hydrogenation by a typical Fischer‐Tropsch synthesis (FTS) was observed on the ordered mesoporous 5wt %Al‐modified Co 3 O 4 ‐Fe 2 O 3 bimetal oxides (m‐CoFe) at a Co/Fe molar ratio of ∼1, which was prepared by a hard templating and co‐infiltration method. The active sites were related with the partially oxidized Co nanoparticles as well as iron carbides. The structurally stable and strongly interacted ordered Co 3 O 4 ‐Fe 2 O 3 mesoporous structures were preferentially transformed to more brittle iron carbides with a simultaneous reduction of Co 3 O 4 to metallic Co under a reductive FTS reaction condition. The m‐CoFe(1) itself without using any solid acid component revealed a higher C 2 −C 4 selectivity of 21.1 % and C 5+ selectivity of 67.9 % at CO conversion of 88.5 % with the corresponding rate of 2.77 mmol/(g cat ⋅s) by enhancing its structural stability due to the partial formations of thermally stable spinel‐type CoFe 2 O 4 . The enhanced structural stability of the m‐CoFe(1) was attributed to the preferential formations of the strongly interacted and partially oxidized Co nanoparticles with the formation of active iron carbides as well.