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Facile Preparation of Cu‐Al Oxide Catalysts and Their Application in the Direct Synthesis of Ethanol from Syngas
Author(s) -
Li Xiaoli,
Zhang Qingde,
Xie Hongjuan,
Gao Xiaofeng,
Wu Yingquan,
Yang Guohui,
Wang Peng,
Tian Shaopeng,
Tan Yisheng
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701910
Subject(s) - catalysis , calcination , selectivity , syngas , ethanol , oxide , chemical engineering , materials science , chemistry , inorganic chemistry , nuclear chemistry , organic chemistry , engineering
A simplified catalytic system K‐Cu/Al 2 O 3 (KCA‐xCu‐ T ) with Cu‐Al oxides was prepared by a facile impregnation method and was successfully applied in the direct synthesis of ethanol from syngas. The results demonstrated that the distribution of CuO, CuAl 2 O 4 , and CuAlO 2 in KCA‐xCu‐ T catalysts can be effectively tuned by varying the calcination temperature ( T /°C) and CuO loading (xCu/wt%). The cooperative effect between Cu 0 and CuAlO 2 (Cu + ) was proved to be responsible for the enhanced ethanol selectivity. Furthermore, the formation of CuAlO 2 could efficiently fix Cu + species in KCA‐10Cu‐900 sample, and thus lead to excellent catalytic stability (300 h at 400 °C). CuAl 2 O 4 itself has no catalytic effect but can be gradually decomposed into Cu + and/or Cu 0 species during reaction, which further influenced the ethanol selectivity (38.4 wt%).