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Oxygen exchange mechanism between isotopic CO2 and Pt/CeO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
43026 45951 2008 6 PDF Available
Title
Oxygen exchange mechanism between isotopic CO2 and Pt/CeO2
Abstract

The oxygen exchange mechanism between C18O2 and CeO2 and the role of Pt in this process have been studied in an advanced TAP reactor in the 200–600 °C temperature range. For bare and Pt-containing CeO2, the exchange of the oxygen atoms of C18O2 takes place in the whole temperatures range studied, and the oxygen exchange rate increases with temperature. The proposed mechanistic pathway consists of the exchange of the oxygen atoms in the C18O2 molecule in two consecutive steps. In the case of bare CeO2, only one of the oxygen atoms of C18O2 is exchanged between 200 and 300 °C, and temperatures above 300 °C are required for the exchange of the second oxygen atom of the C18O2 molecule. Pt accelerates the exchange rate between 200 and 400 °C, mainly favouring the exchange of the second oxygen atom of the C18O2 molecule. The effect of Pt cannot be resolved at higher temperature (above 400 °C), since at high temperature the direct exchange over bare CeO2 is already fast.

Graphical abstractThe oxygen exchange mechanism between C18O2 and CeO2 has been studied between 200 and 600 °C in a TAP reactor. Temperature above 300 °C is required for the exchange of both oxygen atoms of C18O2 with CeO2, and only one oxygen atom is exchanged at lower temperature. Pt accelerates the exchange rate between 200 and 400 °C, presenting minor effect above 400 °C.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Cerium oxide; Carbon dioxide; Isotopic oxygen exchange; TAP; Isotope
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Oxygen exchange mechanism between isotopic CO2 and Pt/CeO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 342, Issues 1–2, 30 June 2008, Pages 144–149
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us