含氧空位的钨掺杂CeTiOx的电子重分布和酸位

IF 1.3 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Advances in Applied Ceramics Pub Date : 2021-04-03 DOI:10.1080/17436753.2021.1919360

Myung-Kun Kim, G. Park, Min-Chul Shin, Hong-Dae Kim, Dae-Seung Cho, Heesoo Lee

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引用次数: 1

摘要

通过电子结构研究了钨掺杂CeTiOx表面酸度的增强。钨的掺杂使Ce3+的比例从12.0%提高到29.6%，XPS证实了这一点。掺杂后的钨以W5+的形式存在，比例为71.5%。在O - k边缘XAS光谱中，增加表明钨掺杂形成了氧空位。w5d -eg峰强度的降低表明在氧空位上形成的电子占据了w5d轨道。W5+的富集是由于电子转移到钨的5d-eg轨道而不是转移到铈离子。用FTIR和NH3-TPD分析了酸位。钨掺杂后，Brønsted酸位的峰值强度和NH3解吸量从66.2µmol g−1增加到136.1µmol g−1。掺杂的钨形成了Brønsted酸位，提高了表面酸度和催化活性。

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Electron redistribution and acid site of tungsten-doped CeTiOx with oxygen vacancies

ABSTRACT The enhancement of surface acidity for tungsten-doped CeTiOx was investigated through electronic structure. Tungsten doping increased the ratio of Ce3+ from 12.0% to 29.6%, which was confirmed by XPS. The doped tungsten was present as W5+ in a ratio of 71.5%. In O K-edge XAS spectra, increase in indicated the formation of oxygen vacancies through tungsten doping. The decrease in W 5d-eg peak intensity demonstrated the occupation of the W 5d orbital by electrons formed at the oxygen vacancies. The enrichment of W5+ was owing to transfer of electrons to 5d-eg orbital of tungsten rather than to cerium ions. The acid sites were analysed using FTIR and NH3-TPD. The peak intensity of Brønsted acid sites and amount of NH3 desorption increased from 66.2 to 136.1 µmol g−1 with tungsten doping. The doped tungsten formed Brønsted acid sites and led to enhanced surface acidity and catalytic activity.

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来源期刊

Advances in Applied Ceramics 工程技术-材料科学：硅酸盐

CiteScore

4.40

自引率

4.50%

发文量

审稿时长

5.2 months

期刊介绍： Advances in Applied Ceramics: Structural, Functional and Bioceramics provides international coverage of high-quality research on functional ceramics, engineering ceramics and bioceramics.