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Quantitative analyses of oxygen release/storage and CO2 adsorption on ceria and Pt–Rh/ceria

Paper ID Volume ID Publish Year Pages File Format Full-Text
52718 46882 2007 6 PDF Available
Title
Quantitative analyses of oxygen release/storage and CO2 adsorption on ceria and Pt–Rh/ceria
Abstract

The CO/O2 and CO2 pulse experiments were carried out to acquire useful information about oxygen release/storage and CO2 adsorption on ceria and Pt–Rh/ceria. In the CO pulse experiments at 500 °C, ca. 60% of CO uptake was released as CO2 while the rest of CO uptake was retained as carbon residuals on the surfaces of both samples. The carbon residuals could be removed when O2 was provided. In the CO2 pulse experiments, the adsorption of CO2 was found to relate to the temperatures and the oxidation states of surface cerium. The reduced Ce3+ sites (O vacancies) were responsible for the adsorption of CO2 at the temperature of 500 °C. In addition, the molar ratios of CO2 adsorption to O vacancies (38–39%) were in agreement with the ratios of carbon residuals to CO uptake ( ca. 40%) measured in the CO pulse experiments. Quantitative analyses of oxygen release/storage and CO2 adsorption implied that in the process of oxygen release, carbon residuals were possibly in the form of a carbonate-like species due to the adsorption of CO2 onto the reduced Ce3+ sites.

Keywords
Ceria; Pt–Rh/ceria; Oxygen release/storage; CO2 adsorption; TAP (temporal analysis of products)
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Quantitative analyses of oxygen release/storage and CO2 adsorption on ceria and Pt–Rh/ceria
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 8, Issue 4, April 2007, Pages 725–730
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
Full-text PDF Download
Online Support
Any Questions? feel free to contact us