Ga and In modified ceria as supports for cobalt-catalyzed Fischer-Tropsch synthesis

被引：6

作者：

Gnanamani, Muthu Kumaran ^{[1
]}

Jacobs, Gary ^{[1
,2
]}

Shafer, Wilson D. ^{[1
]}

Martinelli, Michela ^{[1
]}

Cronauer, Donald C. ^{[3
]}

Kropf, A. Jeremy ^{[3
]}

Marshall, Christopher L. ^{[3
]}

Davis, Burtron H. ^{[1
]}

机构：

[1] Univ Kentucky, Ctr Appl Energy Res, 2540 Res Pk Dr, Lexington, KY 40511 USA

[2] Univ Texas San Antonio, Chem Engn Program, Dept Biomed, UTSA Circle, San Antonio, TX 78249 USA

[3] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA

来源：

APPLIED CATALYSIS A-GENERAL | 2017年 / 547卷

关键词：

Fischer-Tropsch synthesis; Ag promoter; CeO2; CeO2-Ga2O3; CeO2-In2O3; Oxygenates; L-III EDGES; CO/AL2O3; CATALYSTS; REDUCTION PROPERTY; CO; DEACTIVATION; IRON; SELECTIVITY; XANES; REDUCIBILITY; HYDROCARBONS;

D O I：

10.1016/j.apcata.2017.08.026

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：

Ga- and In-modified ceria (Ce0.8Ga0.2O2, Ce0.8In0.2O2) materials were used as supports for cobalt-catalyzed Fischer-Tropsch synthesis (FTS). The addition of Ga to ceria was found to improve CO conversion for cobalt-catalyzed FTS, while the addition of In tended to decrease it. A similar trend was observed with the Ag-promoted cobalt/ceria catalysts. Doping of ceria with Ga or In decreased methane and increased the selectivity to olefins and alcohols for Ag-promoted cobalt/ceria. The sum of the products of olefins and alcohols for various catalysts exhibited a decreasing trend as follows: Ag-Co/Ce-Ga > Ag-Co/Ce-In > Ag-Co/Ce. Results of H-2-TPR-XANES showed that adding of Ga or In to ceria increases the fraction of Ce3+ in the surface shell for both unpromoted and Ag-promoted catalysts in the range of temperature typical of catalyst activation. This partially reduced ceria plays an important role in controlling the product selectivity of cobalt-catalyzed FT synthesis.

引用

页码：115 / 123

页数：9

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