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The effect of potassium on Ni/Al2O3 catalyst in relation to CO/H2 reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
41101 45877 2012 8 PDF Available
Title
The effect of potassium on Ni/Al2O3 catalyst in relation to CO/H2 reaction
Abstract

The effect of potassium on nickel/alumina catalysts in relation to CO/H2 reaction was studied. The examinations were performed on the samples containing 90 wt.% of nickel and up to 6.0 mol% of potassium. XRD studies and adsorption measurements (H2, O2 and CO) showed a small effect of potassium on nickel dispersion; at the same time potassium enhanced heat of CO adsorption, which implies that the promoter locates on Ni surface. Temperature-programmed (TP) studies showed that potassium significantly retards the hydrogenation of pre-adsorbed CO and these results were confirmed by steady state tests of CO/H2 reaction. TP desorption of pre-adsorbed CO provided ambiguous view on the effect of potassium on CO dissociation. Instead, it was revealed that potassium strongly retards hydrogenation of carbon species adsorbed on nickel, which shed a new light on the effect of potassium on CO/H2 reaction.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (132 K)Download as PowerPoint slideHighlights► Potassium does not affect dispersion of nickel supported on alumina. ► Potassium hardly promotes CO dissociation on Ni/Al2O3 catalyst. ► Potassium strongly retards reduction of carbon preadsorbed on Ni/Al2O3 catalyst.

Keywords
Nickel/alumina catalyst; Nickel dispersion; Effect of potassium; CO hydrogenation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 413–414, 31 January 2012, Pages 132–139
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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