Effects of Zn and Mn Promotion in Fe-Based Catalysts Used for COx Hydrogenation to Long-Chain Hydrocarbons

被引：27

作者：

Falbo, Leonardo ^{[1
]}

Martinelli, Michela ^{[1
]}

Visconti, Carlo Giorgio ^{[1
]}

Lietti, Luca ^{[1
]}

Forzatti, Pio ^{[1
]}

Bassano, Claudia ^{[2
]}

Deiana, Paolo ^{[2
]}

机构：

[1] Politecn Milan, LCCP, Dept Energy, Via La Masa 34, I-20156 Milan, Italy

[2] ENEA, Via Anguillarese 301, I-00123 Rome, Italy

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2017年 / 56卷 / 45期

关键词：

FISCHER-TROPSCH SYNTHESIS; MANGANESE OXIDE CATALYSTS; IRON CATALYSTS; CARBON-DIOXIDE; K CATALYSTS; LIGHT OLEFINS; SELECTIVITY; DEACTIVATION; POTASSIUM; KINETICS;

D O I：

10.1021/acs.iecr.7b01494

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The promoting effect of Mn and Zn on the performance of Fe-based catalysts has been comparatively investigated in the COx hydrogenation to heavy hydrocarbons in the presence of H-2-deficient streams. To this scope, two catalysts have been prepared by coprecipitation, followed by impregnation with Cu and K, and tested at 220 degrees C and 30 bars after an activation treatment with syngas. Both catalysts have been found to be active and selective to long-chain hydrocarbons in the presence of either H-2/CO or H-2/CO2 mixtures. Despite lower catalyst reducibility, the presence of Zn has resulted in higher COx conversion rates. Furthermore, the Zn-promoted catalyst converted COx into heavier and less-saturated hydrocarbons. These results are consistent with a role of Zn in promoting the catalyst basicity, which is a key property to keep low the superficial H/C ratio and to slow chain termination reactions as well as secondary olefin hydrogenations.

引用

页码：13147 / 13157

页数：11

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