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CO 2 hydrogenation to C 5+ hydrocarbons over K‐promoted Fe/CNT catalyst: Effect of potassium on structure–activity relationship
Author(s) -
Dai Liya,
Chen Yao,
Liu Renjie,
Li Xin,
Ullah Niamat,
Li Zhenhua
Publication year - 2021
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.6253
Subject(s) - catalysis , chemistry , selectivity , chemisorption , fischer–tropsch process , potassium , inorganic chemistry , chemical engineering , nuclear chemistry , organic chemistry , engineering
Developing efficient catalysts for direct CO 2 hydrogenation to fuel hydrocarbons is of great significance for the effective utilization of CO 2 , and C 5+ selectivity is one critical indicator for the process economics. In this work, a series of K‐promoted Fe/CNT catalysts were prepared by the co‐impregnation method, and their catalytic performance for CO 2 hydrogenation was studied in a slurry‐bed reactor. As a result, CO 2 conversion and C 5+ selectivity showed positive correlation with the increase of K/Fe ratio from 0 to 0.3, but further increase of K/Fe ratio above 0.3 slightly affected its. The catalyst with a K/Fe molar ratio of 0.3 achieved the best performance with CO 2 conversion of 23.7% and C 5+ selectivity of 56%. In addition, the structure–activity relationship of the catalyst was discussed based on various characterization results. K‐modified catalysts presented a higher specific surface area and stronger CO 2 chemisorption, which helped to improve CO 2 conversion and C 5+ selectivity. However, excessive potassium loading caused a loss of specific surface area, reduction degree, and graphitization degree of the catalyst, which inhibited the CO 2 chemisorption and the formation of C 5+ hydrocarbons.