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Activation of solid surface as catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
55089 47040 2013 5 PDF Available
Title
Activation of solid surface as catalyst
Abstract

The original surface of a solid is not always active as a catalyst, but the surface becomes active during reaction. Activation of surfaces may be classified as follows; (i) originally active surfaces, (ii) intermediates produced by reaction with surface atoms, (iii) formation of active sites with functional groups, (iv) formation of active surface compounds, (v) cooperation of multiple catalytic processes. In this review, we discuss two important environmental reactions, one is NO + H2 → 1/2 N2 + H2O catalyzed by single crystal Pt–Rh-ally and Pt/Rh or Rh/Pt bimetals, and the other is the preferential oxidation (PROX) reaction of CO in H2 by heavily FeOx-loaded Pt/TiO2 catalyst and Pt-supported carbon with Ni–MgO. The specific activity of the Pt–Rh catalyst arises from the formation of special ordered bimetallic surface layers composed of (RhO) on Pt-layer. Formation of an active over-layer compound was confirmed on Pt0.25Rh0.75(1 0 0) alloy, Pt/Rh(1 0 0), Rh/Pt(1 0 0), Pt/Rh(1 1 0) and Rh/Pt(1 1 0) bimetal surfaces. The PROX reaction of CO in H2 was attained on two new catalysts, one being FeOx/Pt/TiO2 (ca. 100 wt.% FeOx) and the other Pt supported on carbon with Ni–MgO. The mechanism of the PROX reaction of CO was deduced by in situ DRIFT spectroscopy, which indicates a coupled reaction of CO + OH− → HCOO− and HCOO + OH → CO2 + H2O.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (112 K)Download as PowerPoint slideHighlights► Activation of solid surface as catalyst is reviewed in this paper. ► The specific activity of the Pt–Rh catalyst arises from the formation of special ordered bimetallic surface layers composed of (RhO) on Pt-layer. ► PROX of CO in H2 over FeOx/Pt/TiO2 obeys entirely different mechanism from the traditional one by involving the coupling of CO + OH− → HCOO− and HCOO + OH → CO2 + H2O reactions.

Keywords
Reconstructive activation; Working catalyst surface; Active surface compounds; Structure insensitive catalysis; PROX reaction; NO reduction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 201, 1 March 2013, Pages 2–6
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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Online Support
Any Questions? feel free to contact us