Surface engineering of perovskite catalysts: Using acid treatment to enhance CO and CH4 oxidation activity

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-04-30 DOI:10.1016/j.apcata.2025.120312

JeongHyun Cho , Jimin Yun , Minjae Kim , Kyung Tae Park , Hai Woong Park , Ji Chul Jung

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Abstract

This study examined the effects of acid treatment on LaMnO₃ (LMO) and LaCoO₃ (LCO) perovskites and their catalytic performance in CO and CH₄ oxidation. Acid treatment selectively removed La cations, creating oxygen vacancies and altering the electronic properties of surface oxygen species and B-site cations. In LCO, it increased the Co²⁺ concentration while reducing the electron densities of surface oxygen species. These changes reduced T₂₀ by 39 ℃ and 123 ℃ for CO and CH₄ oxidation, respectively, after 5 h of acid treatment. However, acid-treated LMO for 5 h exhibited improved CO oxidation (T₂₀ decreased by 49 ℃) owing to enriched surface adsorbed oxygen species but declined CH₄ oxidation activity (T₂₀ increased by 77 ℃), attributed to the increased Mn⁴⁺ concentration and minimal enhancement in oxygen mobility. This study emphasizes the importance of tailored surface engineering strategies, providing insights into the systematic design of perovskite catalysts for various oxidation reactions.

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钙钛矿催化剂的表面工程：采用酸处理提高CO和CH4氧化活性

本研究考察了酸处理对LaMnO3 （LMO）和LaCoO3 （LCO）钙钛矿催化CO和CH4氧化性能的影响。酸处理选择性地去除La阳离子，产生氧空位，改变表面氧和b位阳离子的电子性质。在LCO中，它增加了Co2+浓度，同时降低了表面氧的电子密度。经过5 h的酸处理后，CO和CH4氧化的T20分别降低了39℃和123℃。然而，经过5 h酸处理的LMO由于表面吸附氧的富集，CO氧化活性提高（T20降低了49℃），而CH4氧化活性下降（T20提高了77℃），这是由于Mn4+浓度的增加和氧迁移率的微小增强。这项研究强调了定制表面工程策略的重要性，为各种氧化反应的钙钛矿催化剂的系统设计提供了见解。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.