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Direct Conversion of Syngas to Higher Alcohols over a CuCoAl|t‐ZrO 2 Multifunctional Catalyst
Author(s) -
Huang Chao,
Zhu Can,
Zhang Mingwei,
Lu Yongwu,
Wang Qianhao,
Qian Heming,
Chen Jiangang,
Fang Kegong
Publication year - 2021
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.202100293
Subject(s) - selectivity , syngas , catalysis , chemistry , adsorption , hydrocarbon , alcohol , inorganic chemistry , organic chemistry
Selective synthesis of higher alcohols from syngas is promising but remains challenging owing to the low stability and selectivity towards higher alcohols. Here we introduce a CuCoAl|t‐ZrO 2 (t denotes tetragonal crystal phase) multifunctional catalyst that can achieve an alcohol selectivity of 64.8 % with 79.6 % C 2+ OH, and a total selectivity of alcohols and olefins to 81.7 %. The proper proximity was tuned to increase selectivity towards alcohols and decrease the selectivity towards hydrocarbons. The lower surface [H*]/[C*] ratio due to the stronger basic sites of the CuCoAl|t‐ZrO 2 limited alkyl (CH x ) species hydrogenation, and promoted CO insertion and carbon chain growth, resulting in improving the alcohols selectivity. Meanwhile, the weaker adsorption of bridge‐type adsorbed CO and the lower decomposition rate of multi‐bonded adsorbed CO over CuCoAl|t‐ZrO 2 inhibited hydrocarbon generation. The selective promotion of the reaction route via the synergetic effect between CuCoAl and t‐ZrO 2 was proposed to boost higher alcohols selectivity. This work may aid the rational design of effective multifunctional catalyst with synergistic effects for tuning selectivity.