The effect of Mg location on Co-Mg-Ru/γ-Al2O3 Fischer-Tropsch catalysts

被引：3

作者：

Gallagher, James R. ^{[1
]}

Boldrin, Paul ^{[1
]}

Combes, Gary B. ^{[2
]}

Ozkaya, Don ^{[3
]}

Enache, Dan I. ^{[3
]}

Ellis, Peter R. ^{[3
]}

Kelly, Gordon ^{[2
]}

Claridge, John B. ^{[1
]}

Rosseinsky, Matthew J. ^{[1
]}

机构：

[1] Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England

[2] Johnson Matthey PLC, Billingham TS23 1LB, Cleveland, England

[3] Johnson Matthey PLC, Reading RG4 9NH, Berks, England

来源：

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 2016年 / 374卷 / 2061期

基金：

英国工程与自然科学研究理事会;

关键词：

Fischer-Tropsch; catalysis; cobalt; alumina; XRD; COBALT; ALUMINA; FUELS; BIOMASS; SUPPORT; GAMMA;

D O I：

10.1098/rsta.2015.0087

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The effectiveness of Mg as a promoter of Co-Ru/gamma-Al2O3 Fischer-Tropsch catalysts depends on how and when the Mg is added. When the Mg is impregnated into the support before the Co and Ru addition, some Mg is incorporated into the support in the form of MgxAl2O3-x if the material is calcined at 550 degrees C or 800 degrees C after the impregnation, while the remainder is present as amorphous MgO/MgCO3 phases. After subsequent Co-Ru impregnation MgxCo3-xO4 is formed which decomposes on reduction, leading to Co(0) particles intimately mixed with Mg, as shown by high-resolution transmission electron microscopy. The process of impregnating Co into an Mg-modified support results in dissolution of the amorphous Mg, and it is this Mg which is then incorporated into MgxCo3-xO4. Acid washing or higher temperature calcination after Mg impregnation can remove most of this amorphous Mg, resulting in lower values of x in MgxCo3-xO4. Catalytic testing of these materials reveals that Mg incorporation into the Co oxide phase is severely detrimental to the site-time yield, while Mg incorporation into the support may provide some enhancement of activity at high temperature.

引用

页数：18

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