The role of different state ZnO over non-stoichiometric Zn-Cr spinel catalysts for isobutanol synthesis from syngas

被引:50
作者
Tian, Shaopeng [1 ,2 ]
Tan, Li
Wu, Yingquan [1 ]
Kou, Yongli [1 ]
Xie, Hongjuan [1 ]
Tsubaki, Noritatsu [3 ]
Tan, Yisheng [1 ]
机构
[1] Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Shanxi, Peoples R China
[2] Xijing Univ, Dept Fdn, Xian 710000, Shaanxi, Peoples R China
[3] Toyama Univ, Sch Engn, Dept Appl Chem, Gofuku 3190, Toyama 9308555, Japan
基金
中国国家自然科学基金;
关键词
Synthesis gas; Zinc oxide; Non-stoichiometric Zn-Cr spinel; Synergic effects; Isobutanol; HIGHER ALCOHOL SYNTHESIS; CHROMIUM MIXED OXIDES; ABSORPTION FINE-STRUCTURE; CATION DISTRIBUTION; NON-STOICHIOMETRY; ACTIVATED CARBON; BIO-OIL; CO; REACTIVITY; METHANOL;
D O I
10.1016/j.apcata.2017.02.016
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A series of Zn-Cr based catalysts were prepared using combustion method (Comb-ZC), impregnation method (Impr-ZC), coprecipitation method (Copr-ZC) and fractional precipitation method (Frac-ZC). The catalysts were then examined for their ability to selectively convert syngas into higher alcohol with a special alcohol distribution (high selectivity for isobutanol). CO conversion of ca. 25%, alcohol selectivity of ca. 49% and selectivity of ca. 26% for isobutanol was achieved over the Frac-ZC catalyst. The better performance of Frac-ZC catalyst could be explained by smaller zinc oxide particle size, the higher proportion of non-stoichiometric Zn-Cr spinel phase and the good synergic effects between zinc oxide phase and non-stoichiometric Zn-Cr spinel phase. The better reducibility as well as appropriate CO-absorption property of Frac-ZC catalyst also plays an essential role in the process of isobutanol synthesis. The study also shows the excess zinc oxide could aggravate the cation disorder distribution in non-stoichiometric Zn-Cr spinel structure that provide more defects and oxygen vacancies for boosting isobutanol formation. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:57 / 66
页数:10
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