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Preferential CO oxidation in hydrogen-rich stream over Pt catalysts modified with alkali metals: Part I. Catalytic performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
43267 45960 2008 8 PDF Available
Title
Preferential CO oxidation in hydrogen-rich stream over Pt catalysts modified with alkali metals: Part I. Catalytic performance
Abstract

In preferential CO oxidation in H2-rich stream (PROX), the additive effect of potassium on Pt catalysts was more remarkable over Al2O3 than over SiO2, ZrO2, Nb2O5 and TiO2. The additive effect of potassium to Pt/Al2O3 was more effective than other alkali metals. Especially, the presence of H2 drastically promoted CO oxidation over Pt/Al2O3 modified with potassium. On the other hand, the suppressing effect of steam on the PROX was more significant over K-Pt/Al2O3 than over Pt/Al2O3, although the PROX activity of K-Pt/Al2O3 was much higher than that of Pt/Al2O3 even under the presence of steam. The different effect of steam addition to the PROX over K-Pt/Al2O3 suggests that the active site can be Pt surface modified with potassium ions.

Graphical abstractIn preferential CO oxidation in H2-rich stream (PROX), the additive effect of potassium to Pt/Al2O3 was more effective than other alkali metals. The PROX activity of K-Pt/Al2O3 was much higher than that of Pt/Al2O3 under the presence of steam, and the effect of steam addition over K-Pt/Al2O3 suggests that the active site can be Pt surface modified with potassium ions.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Preferential CO oxidation; Platinum; Alkali metal ions; Potassium; Presence of H2
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Preferential CO oxidation in hydrogen-rich stream over Pt catalysts modified with alkali metals: Part I. Catalytic performance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 343, Issues 1–2, 1 July 2008, Pages 117–124
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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