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Transient analysis of oxygen storage capacity of Pt/CeO2–ZrO2 materials with millisecond- and second-time resolution

Paper ID Volume ID Publish Year Pages File Format Full-Text
47799 46482 2009 8 PDF Available
Title
Transient analysis of oxygen storage capacity of Pt/CeO2–ZrO2 materials with millisecond- and second-time resolution
Abstract

A simple method for determining the speed of oxygen release from Pt/CeO2–ZrO2 materials is proposed. We determined the speed of oxygen release from three differently prepared Pt(1 wt%)/CeO–ZrO2 catalysts by two methods: the method employing temporal analysis of products (TAP) reactor with CO, O2, and CO2 pulsed gases, and a conventional method with CO and O2 switch gases. Strong CO2 adsorption precluded correct analysis of oxygen release speed, when it was determined from the amount of CO2 formed. Therefore, instead of the amount of CO2 formed, we suggested the tmax value, defined as the position of maximal intensity of CO2 transient responses obtained upon low-intensity (1015–1016 molecules) CO pulsing in the TAP reactor. Shorter the tmax value, higher the rate of oxygen release, because the temperature dependence of the tmax determined in the present study resembles the previous results of oxygen release analysis [T. Tanabe, A. Suda, C. Descorme, D. Duprez, H. Shinjoh, M. Sugiura, Stud. Surf. Sci. Catal. 138 (2001) 135].

Keywords
Oxygen storage capacity; Mechanism; TAP; Platinum; Ceria
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Transient analysis of oxygen storage capacity of Pt/CeO2–ZrO2 materials with millisecond- and second-time resolution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 89, Issues 3–4, 15 July 2009, Pages 476–483
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