Surface regulation of perovskite LaPd0.1Mn0.9O3 for improved toluene oxidation activity

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths Pub Date : 2024-09-05 DOI:10.1016/j.jre.2024.09.008

Lei Li , Yanjie Liang , Jie Li , Jingling Shao , Jianjian Zhu , Dong Wang

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Abstract

Surface regulation is a crucial technique for improving catalytic performance in heterogeneous catalysis. Although perovskite oxides containing noble metals show good performance and excellent thermal stability, the encapsulation of noble metals in perovskite lattice restricts the exposure/usage of active sites. Herein, a method of high-temperature calcination coupling with selective dissolution was adopted to tune the physicochemical environment on the LaPd_0.1Mn_0.9O₃ catalyst surface. The X-ray diffraction (XRD) and Raman results reveal that more Pd species emerge on the surface by elevating the calcination temperature, resulting in improved catalytic toluene oxidation activity. A further acid-etching of the LPMO-900 catalyst can also boost catalytic performance, being attributed to the enhanced redox ability and abundant surface oxygen vacancies. In addition, the optimized catalyst also exhibits excellent resistance to sintering and water vapor. This study provides new avenues for the rational design of highly efficient perovskite-based catalysts.

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钙钛矿LaPd0.1Mn0.9O3对提高甲苯氧化活性的表面调控

在多相催化中，表面调控是提高催化性能的关键技术。虽然含有贵金属的钙钛矿氧化物具有良好的性能和优异的热稳定性，但贵金属在钙钛矿晶格中的封装限制了活性位点的暴露/使用。本文采用高温煅烧耦合选择性溶解的方法对LaPd0.1Mn0.9O3催化剂表面的物理化学环境进行了调整。x射线衍射（XRD）和拉曼光谱（Raman）结果表明，随着煅烧温度的升高，表面出现了更多的Pd物质，从而提高了催化甲苯氧化活性。进一步对LPMO-900催化剂进行酸蚀也可以提高催化性能，这归因于氧化还原能力的增强和丰富的表面氧空位。此外，优化后的催化剂还具有优异的抗烧结性和抗水蒸气性。该研究为高效钙钛矿基催化剂的合理设计提供了新的途径。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.