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Preferential methanation of CO in a syngas involving CO2 at lower temperature range

Paper ID Volume ID Publish Year Pages File Format Full-Text
44510 46037 2006 7 PDF Available
Title
Preferential methanation of CO in a syngas involving CO2 at lower temperature range
Abstract

Preferential elimination of CO in a model syngas involving CO2 at a low temperature range was studied on a series of Ni-based multi-component composite catalysts supported on θ-alumina spheres. The catalysts were characterized by TPR to evaluate the change of reduction temperature with the catalyst composition, which corresponded to the catalytic performance. Performance of CO methanation on these catalysts was compared in a continuous flow reactor under atmospheric pressure. The Rh-modification onto the known highly active three-component methanation catalyst Ni-La2O3-Ru exhibited an evident enhancement in the activity. Complete conversion of CO to methane preferentially occurred on this four-component catalyst, Ni-La2O3-Ru-Rh, as low as 230 °C. As long as CO remained in the syngas, methanation of CO2 was completely retarded. It was reconfirmed that La2O3 increases Ni dispersion, and Rh and Ru enhance H2 adsorption, and induce the reduction of main catalyst component NiOx at a low temperature range by hydrogen spillover. These are the causes of the very high performance of this catalyst.

Keywords
Preferential methanation of CO; Rh-modified Ni-based composite catalyst; Hydrogen spillover; TPR measurements
First Page Preview
Preferential methanation of CO in a syngas involving CO2 at lower temperature range
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 314, Issue 1, 25 October 2006, Pages 47–53
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis