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Structure–activity correlation in thin film model catalysts: CO hydrogenation on Rh/VOx: Part II. Catalytic activity as a function of oxidation and reduction

Paper ID Volume ID Publish Year Pages File Format Full-Text
44297 46014 2006 7 PDF Available
Title
Structure–activity correlation in thin film model catalysts: CO hydrogenation on Rh/VOx: Part II. Catalytic activity as a function of oxidation and reduction
Abstract

The structure and morphology of thin film catalysts, consisting of well-defined Rh particles in contact with promoting and supporting vanadium oxides and subjected to oxidative and reductive treatments at elevated temperature, were correlated with the associated activity changes in CO hydrogenation. All systems exhibit a steady decrease of the catalytic activity with reduction temperature (373–823 K), which is in part due to vanadia covering free metal surface area and in part to the formation of stable bulk alloy phases.By comparison with the results of electron microscopy, the initial decrease of catalytic activity (between 373 and 473 K) is primarily caused by decoration of Rh particles by reduced VOx species. A strong decrease of catalytic activity after reduction above 573 K is related the formation of distinct Rh–V alloys. A selectivity shift towards methane at high reduction temperatures goes along with this activity loss.

Keywords
Structure–activity correlation; Reduction; CO hydrogenation; Alloy formation; Vanadium; Rhodium
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Structure–activity correlation in thin film model catalysts: CO hydrogenation on Rh/VOx: Part II. Catalytic activity as a function of oxidation and reduction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 308, 10 July 2006, Pages 43–49
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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