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Activation of an Ir-in-CeO2 catalyst by pulses of CO: The role of oxygen vacancy and carbonates in CO oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
55601 47058 2012 6 PDF Available
Title
Activation of an Ir-in-CeO2 catalyst by pulses of CO: The role of oxygen vacancy and carbonates in CO oxidation
Abstract

An Ir-in-CeO2 catalyst was activated by pulses of CO, and the effects of the formed oxygen vacancy and carbonates on CO oxidation were studied by a pulse calorimetry. A volcano-like relationship between the amount of oxygen vacancy and the catalyst activity is established. The presence of oxygen vacancy is favorable for CO oxidation, with the best activity when 1.5% amount of oxygen vacancy is obtained. However, the activity decreases with further increase of oxygen vacancy. A quantitative analysis of the reaction process suggests that the increase of oxygen vacancy promotes the buildup of strongly adsorbed carbonates, leading to the prohibition of the adsorption and activation of CO but not O2. The reduced supply of adsorbed CO to react with oxygen species may result in the decreasing activity with more oxygen vacancy.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (111 K)Download as PowerPoint slideHighlights► Oxygen vacancy and carbonates were one step formed during CO pretreatment on Ir-in-CeO2. ► The presence of 1.5% amount of oxygen vacancy was best but more amount led to the decreasing activity for CO oxidation. ► The decrease of activity might result from the reduced supply of adsorbed CO to react with oxygen species due to the buildup of strongly adsorbed carbonates.

Keywords
Iridium; CeO2; Oxygen vacancy; Carbonates; CO oxidation
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Activation of an Ir-in-CeO2 catalyst by pulses of CO: The role of oxygen vacancy and carbonates in CO oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 180, Issue 1, 17 January 2012, Pages 155–160
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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Price after discount Only $4.95
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