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Transition Metal-Promoted Oxygen Ion Conductors as Oxidation Catalyst

Published online by Cambridge University Press:  15 February 2011

Wei Liu ,
Adel Sarofim  and
Maria Flytzani-Stephanopoulos
Wei Liu
Affiliation:
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Adel Sarofim
Affiliation:
Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
Maria Flytzani-Stephanopoulos
Affiliation:
Department of Chemical Engineering, Tufts University, Medford, MA 02155
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Abstract

A novel metal oxide composite catalyst for the complete oxidation of carbon monoxide and hydrocarbons was prepared by combining oxygen ion conducting materials with active transition metals. The oxygen ion conductors used were typical fluorite-type oxides, such as ceria, zirconia, and others. Active base metal catalysts, such as copper, were used as additives to promote the catalytic properties of oxygen ion conductors. The intimate contact of the two kinds of materials gave rise to a highly active oxidation catalyst. On Cu-Ce-O composite catalysts, 95% of carbon monoxide was oxidized by air at ∼100 °C. Complete methane oxidation on the same catalyst took place at ∼550 °C. When the stoichiometric amount of sulfur dioxide was used to oxidize carbon monoxide, 96% of sulfur dioxide was reduced to elemental sulfur at temperatures above 460 °C with 99% of sulfur dioxide conversion. This type of composite catalyst also showed excellent resistance to water poisoning.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 344: Symposium I – Materials and Processes for Environmental Protection , 1994 , 145
Copyright
Copyright © Materials Research Society 1994

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