Reduction properties of Ce in CeOx/Pt/Al2O3 catalysts

Q1 Materials Science

Catalysis Structure & Reactivity Pub Date : 2015-04-01 DOI:10.1179/2055075815Y.0000000001

P. Wells, E. Crabb, C. R. King, S. Fiddy, A. Amieiro-Fonseca, D. Thompsett, A. Russell

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引用次数: 6

Abstract

Abstract A controlled surface reaction (CSR) technique has been successfully employed to prepare a series of CeOx modified Pt/Al2O3 catalysts, offering a unique system to specifically probe the relationship between Ce and Pt without any bulk CeO2 present. Ce L3 edge X-ray absorption near edge structure (XANES) analysis was used to ascertain the oxidation state of the Ce in the catalyst materials in atmospheres of air, H2 (g), and CO (g) at room temperature. The XANES data showed that the Ce was present as both Ce3+ and Ce4+ oxidation states in an atmosphere of air, becoming predominantly present as Ce3+ in H2 and CO. The results indicate the role of Pt in the process, and show that with the absence of bulk CeO2, changes in Ce oxidation state can be observed at non-elevated temperatures. The CeOx/Pt/Al2O3 catalysts were tested for their performance toward the water gas shift (WGS) reaction and showed improved performance compared to the unmodified Pt/Al2O3, even at very low concentrations of Ce (∼0.35 wt-%).

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CeOx/Pt/Al2O3催化剂中Ce的还原性能

摘要:采用可控表面反应(CSR)技术成功制备了一系列CeOx修饰Pt/Al2O3催化剂，提供了一个独特的体系，可以在没有大块CeO2存在的情况下特异性地探测Ce和Pt之间的关系。采用x射线吸收法(XANES)分析了催化剂材料中铈在空气、H2 (g)和CO (g)气氛下的室温氧化态。XANES数据表明，Ce在空气气氛中以Ce3+和Ce4+的形式存在，在H2和CO中以Ce3+的形式主要存在。结果表明Pt在这一过程中发挥了作用，并表明在没有大量CeO2的情况下，在非高温下可以观察到Ce氧化态的变化。CeOx/Pt/Al2O3催化剂在水煤气转换(WGS)反应中的性能测试表明，即使在极低浓度的Ce (~ 0.35 wt-%)下，与未改性的Pt/Al2O3相比，其性能也有所提高。

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来源期刊

Catalysis Structure & Reactivity CHEMISTRY, PHYSICAL-

CiteScore

4.80

自引率

0.00%

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