通过酸蚀提高掺杂 CuO 的 CeO2 催化剂的烟尘氧化活性

IF 3.8 3区化学 Q2 CHEMISTRY, PHYSICAL

Catalysts Pub Date : 2023-11-23 DOI:10.3390/catal13121463

Changlong Zheng, Xiaodong Wu, Zhenguo Li, Rui Ran, D. Weng

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引用次数: 0

摘要

铜氧化物倾向于聚集在 CeO2 表面，其中含有大量的 Cu。在本研究中，用硝酸处理了掺杂大量 CuO 的 CeO2 催化剂，以改善其烟尘氧化催化性能。研究阐明了酸蚀刻对 CuO 掺杂 CeO2 催化剂结构特性的影响。表征结果表明，CuCe 上形成了聚集的 CuO 颗粒。酸蚀刻显著增加了 CuCe 的表面积。此外，酸蚀还促进了表面吸附氧物种和氧空位的形成，并降低了与 CeO2 弱相互作用的 CuOx 物种的含量。烟尘温度编程氧化结果表明，对 CuCe 催化剂进行酸蚀刻可将 T50 从 443 ℃ 降至 383 ℃。等温反应结果也表明，CuCe 的酸腐蚀导致反应速率从 16.2 μmol min-1 g-1 提高到 46.0 μmol min-1 g-1。

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Enhanced Soot Oxidation Activity of a CuO-Doped CeO2 Catalyst via Acid Etching

Copper oxides tend to agglomerate on the surface of CeO2, with a high amount of Cu. In this study, a CeO2 catalyst with a high CuO doping amount was treated with nitric acid to improve its catalytic performance for soot oxidation. The effect of acid etching on the structural properties of the CuO-doped CeO2 catalyst were elucidated. The characterization results indicated that aggregated CuO particles formed over CuCe. The acid etching resulted in a remarkable increase in the surface area of CuCe. Additionally, acid etching promoted the formation of surface-adsorbed oxygen species and oxygen vacancy, and reduced the content of CuOx species with weak interaction with CeO2. The soot temperature-programmed oxidation results show the acid etching of CuCe catalyst could reduce the T50 from 443 to 383 °C. The isothermal reaction results also suggest that acid etching of CuCe leads to an increase in reaction rate from 16.2 to 46.0 μmol min−1 g−1.

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来源期刊

Catalysts CHEMISTRY, PHYSICAL-

CiteScore

6.80

自引率

7.70%

发文量

1330

审稿时长

3 months

期刊介绍： Catalysts (ISSN 2073-4344) is an international open access journal of catalysts and catalyzed reactions. Catalysts publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.