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Issue 32, 2011
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Combined in situXRD and in situXANES studies on the reduction behavior of a rhenium promoted cobalt catalyst

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Abstract

A 10% Co–4% Re/(2% Zr/SiO2) catalyst was prepared by co-impregnation using a silica support modified by 2% Zr. The catalyst was characterized by temperature programmed reduction (TPR), in situXRD and in situXANES analysis where it was simultaneously exposed to H2 using a temperature programmed ramp. The results showed the two step reduction of large crystalline Co3O4 with CoO as an intermediate. TPR results showed that the reduction of highly dispersed Co3O4 was facilitated by reduced rhenium by a H2-spillover mechanism. In situXRD results showed the presence of both, Co-hcp and Co-fcc phases in the reduced catalyst at 400 °C. However, the Co-hcp phase was more abundant, which is thought to be the more active phase as compared to the Co-fcc phase for CO hydrogenation. CO hydrogenation at 270 °C and 5 bar pressure produces no detectable change in the phases during the time of experiment. In situXANES results showed a decrease in the metallic cobalt in the presence of H2/CO, which can be attributed due to oxidation of the catalyst by reaction under these conditions.

Graphical abstract: Combined in situXRD and in situXANES studies on the reduction behavior of a rhenium promoted cobalt catalyst

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Article information


Submitted
22 Mar 2011
Accepted
17 Jun 2011
First published
11 Jul 2011

Phys. Chem. Chem. Phys., 2011,13, 14735-14741
Article type
Paper

Combined in situXRD and in situXANES studies on the reduction behavior of a rhenium promoted cobalt catalyst

N. Kumar, E. A. Payzant, K. Jothimurugesan and J. J. Spivey, Phys. Chem. Chem. Phys., 2011, 13, 14735
DOI: 10.1039/C1CP20856J

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