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Shape‐Selective Zeolites Promote Ethylene Formation from Syngas via a Ketene Intermediate
Author(s) -
Jiao Feng,
Pan Xiulian,
Gong Ke,
Chen Yuxiang,
Li Gen,
Bao Xinhe
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201801397
Subject(s) - syngas , ketene , selectivity , chemistry , ethylene , catalysis , mordenite , olefin fiber , methanol , ethylene oxide , oxygenate , fischer–tropsch process , product distribution , photochemistry , zeolite , organic chemistry , polymer , copolymer
Syngas conversion by Fischer–Tropsch synthesis (FTS) is characterized by a wide distribution of hydrocarbon products ranging from one to a few carbon atoms. Reported here is that the product selectivity is effectively steered toward ethylene by employing the oxide‐zeolite (OX‐ZEO) catalyst concept with ZnCrO x ‐mordenite (MOR). The selectivity of ethylene alone reaches as high as 73 % among other hydrocarbons at a 26 % CO conversion. This selectivity is significantly higher than those obtained in any other direct syngas conversion or the multistep process methanol‐to‐olefin conversion. This highly selective pathway is realized over the catalytic sites within the 8‐membered ring (8MR) side pockets of MOR via a ketene intermediate rather than methanol in the 8MR or 12MR channels. This study provides substantive evidence for a new type of syngas chemistry with ketene as the key reaction intermediate and enables extraordinary ethylene selectivity within the OX‐ZEO catalyst framework.