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Metallic structured catalysts: Influence of the substrate on the catalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
39672 45831 2014 13 PDF Available
Title
Metallic structured catalysts: Influence of the substrate on the catalytic activity
Abstract

•CuOx/CeO2 washcoated on AISI 304 and FeCrAl stainless steel monoliths were studied on PROX.•Oxidized and enameled stainless steels were used as monolithic substrates.•Both activity and selectivity depend on the nature of the alloy and of the metal-catalyst interphase.•Diffusion of Na, Ca and Si from enamel, and Cr and Fe from the substrate is detected.•The metallic substrates of stainless steels monoliths are not spectators.

In order to study the influence of the metallic substrate on the catalytic activity of structured micromonolithic catalysts, a CuOx/CeO2 catalyst was deposited on different oxidized or enameled metallic micromonoliths and tested in the PROX reaction under ideal and realistic conditions. The obtained results show as both activity and selectivity depend on the nature of the alloy and the nature of the interphase between the metal substrate and the catalyst layer. In oxidized micromonoliths, diffusion of Cr and Fe has been observed. For enameled micromonoliths, together with that diffusion, the interaction of the glass–ceramic interphase with the reactive gas streams resulted in the partial hydrolysis of this layer leading to diffusion toward the catalyst surface of the hydrolysis products, namely Na, Ca and Si cations. In some cases, the alteration of the surface composition favors the spreading of the copper active phase. As a result, it must be concluded that the metallic substrates are not spectators, at least in the PROX reaction, playing a fundamental role in the performances of the catalytic devices.

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Keywords
Enamel; Structured reactors; Metallic micromonolith; Diffusion barrier; PROX
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 478, 20 May 2014, Pages 45–57
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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