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Fischer–Tropsch synthesis with ethene co‐feeding: Experimental evidence of the CO‐insertion mechanism at low temperature
Author(s) -
Zhang Yusheng,
Yao Yali,
Chang Jianli,
Lu Xiaojun,
Liu Xinying,
Hildebrandt Diane
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17029
Subject(s) - fischer–tropsch process , chemistry , syngas , dissociation (chemistry) , catalysis , product distribution , chain termination , monomer , cobalt , adsorption , reaction mechanism , stereochemistry , inorganic chemistry , organic chemistry , selectivity , polymer , radical polymerization
Experiments were performed at both normal and rather extreme Fischer–Tropsch Synthesis (FTS) operating conditions over a typical cobalt‐based catalyst, with the aim of exploring if aspects of the reaction mechanism could be elucidated. The results show that CO reacted when co‐feeding C 2 H 4 with syngas, while CO did not react with H 2 in absence of C 2 H 4 , under extremely low‐temperature conditions (140°C). The adsorbed CO and C 2 H 4 may behave as monomers and initiators, respectively, and react with each other to form long chain hydrocarbons. It suggests that the CC bond coupling precedes the CO bond dissociation, which is consistent with the CO‐insertion mechanism. C 3–6 product distribution with a feed of H 2 /CO/C 2 H 4 at low temperature followed the same trends in terms of normal FTS product distribution. The observed FTS‐type chain growth reaction that occurs at abnormally low temperatures (140°C) when co‐feeding C 2 H 4 may provide new insights into the chemistry of FTS.