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Tuning the Facet Proportion of Co 2 C Nanoprisms for Fischer‐Tropsch Synthesis to Olefins
Author(s) -
An Yunlei,
Lin Tiejun,
Gong Kun,
Wang Xinxing,
Zhong Liangshu,
Wang Hui,
Sun Yuhan
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.201902273
Subject(s) - fischer–tropsch process , catalysis , selectivity , facet (psychology) , cobalt , syngas , materials science , cobalt oxide , carbide , methane , chemical engineering , chemistry , nanotechnology , inorganic chemistry , organic chemistry , composite material , psychology , social psychology , personality , engineering , big five personality traits
Cobalt carbide (Co 2 C) exhibits strong facet effect for Fischer‐Tropsch to olefins (FTO) reaction. Herein, we report that the facet proportion of Co 2 C nanostructures can be tuned effectively by incorporating and altering the Mn content in the CoMn composite oxide as catalyst precursor. With the addition of Mn promoter, the Co 2 C nanoprisms with exposed (020) and (101) facets are generated under reaction conditions. In addition, the facet proportion of Co 2 C(020) facet can be effectively improved by enhancing the Mn/Co ratio. With the increase of facet proportion of Co 2 C(020)/Co 2 C(101) ratio, the as‐obtained Co 2 C nanoprisms exhibit higher intrinsic activity and lower methane selectivity during the syngas conversion process. Kinetic experiments also demonstrate that the apparent activation energy (E a ) for CO conversion is significantly reduced as increasing the facet proportion of Co 2 C(020). This work provides a simple and feasible way to tune the exposed facet proportion for the rational design of Co 2 C nanocatalyst for FTO reaction.