Effect of the ZrO2 pore structure on the reduction of a supported cobalt oxide in catalysts for Fischer-Tropsch synthesis

被引：25

作者：

Chernavskii, PA ^{[1
]}

Lermontov, AS ^{[1
]}

Pankina, GV ^{[1
]}

Torbin, SN ^{[1
]}

Lunin, VV ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Moscow 119899, Russia

来源：

KINETICS AND CATALYSIS | 2002年 / 43卷 / 02期

关键词：

Cobalt; Calcination; Y2O3; Reduction Rate; Calcination Temperature;

D O I：

10.1023/A:1015332930882

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：

Processes occurring in the preparation of the Co/ZrO2 + 6% Y2O3 catalyst are studied by temperature-programmed reduction (TPR). The effects of the concentration of Co, the porosity of the support, and the calcination temperature on catalyst reduction were studied. As was shown by continuous magnetization measurements in the course of TPR, metallic cobalt appeared on the microporous support in two temperature ranges irrespective of the precalcination temperature and the concentration of supported cobalt. These factors affect the reduction rate but do not change the maximum temperatures of the corresponding peaks. It is suggested that the first maximum of the Co formation rate is due to the reduction of CoO particles on the surface of the support and within macropores, whereas the second maximum is due to the reduction of CoO particles located within support micropores. Only one temperature range of CoO reduction was found in the macroporous ZrO2 + 6% Y2O3. This effect is likely due to mass transfer in support micropores.

引用

页码：268 / 274

页数：7

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