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Ceramic Foam Catalyst Supports Preparation and Properties

Published online by Cambridge University Press:  15 February 2011

James T. Richardson  and
Martyn V. Twigg
James T. Richardson
Affiliation:
Department of Chemical Engineering, University of Houston, Houston, TX 77204–4792
Martyn V. Twigg
Affiliation:
Johnson Matthey Catalytic Systems Division, Royston, Herts. SG8 5HE, United Kingdom
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Extract

Successful catalyst supports must fulfill different requirements simultaneously [1]. By serving as a base for catalytic components, they provide good activity and selectivity, but certain physical properties are equally important. For example, small catalyst particles are desirable in order to avoid external heat and mass transfer limitations and to provide high effectiveness for the active component dispersed throughout the particle. However, small particles pack with low bed porosities and unacceptable pressure drop results. Open-pore ceramic foams show promising properties that could overcome these difficulties. They have good high temperature resistance, low bulk density and tortuous flow patterns, together with open porosity as high as 85% formed from megapores 0.04 to 1.5 mm in diameter [2]. Characteristic parameters include cell size, window size and surface area, all correlated with the number of pores per inch [PPI]. Ceramic foams were first used as molten metal filters [3,4] and catalytic combustion devices [5–7]. Catalytic applications are beginning to appear and these have been reviewed by Twigg and Richardson [8].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 368: Symposium T – Synthesis and Properties of Advanced Catalytic Materials , 1994 , 315
Copyright
Copyright © Materials Research Society 1995

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