Enhancing the Performance of Ba_xMnO₃ (x = 1, 0.9, 0.8 and 0.7) Perovskites as Catalysts for CO Oxidation by Decreasing the Ba Content.

IF 4.4 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Nanomaterials Pub Date : 2024-08-10 DOI:10.3390/nano14161334

Á Díaz-Verde, M J Illán-Gómez

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Abstract

Mixed oxides featuring perovskite-type structures (ABO₃) offer promising catalytic properties for applications focused on the control of atmospheric pollution. In this work, a series of Ba_xMnO₃ (x = 1, 0.9, 0.8 and 0.7) samples have been synthesized, characterized and tested as catalysts for CO oxidation reaction in conditions close to that found in the exhausts of last-generation automotive internal combustion engines. All samples were observed to be active as catalysts for CO oxidation during CO-TPRe tests, with Ba_0.7MnO₃ (B0.7M) being the most active one, as it presents the highest amount of oxygen vacancies (which act as active sites for CO oxidation) and Mn (IV), which features the highest levels of reducibility and the best redox properties. B0.7M has also showcased a high stability during reactions at 300 °C, even though a slightly lower CO conversion is achieved during the second consecutive reaction cycle. This performance appears to be related to the decrease in the Mn (IV)/Mn (III) ratio.

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通过降低钡含量提高 BaxMnO3（x = 1、0.9、0.8 和 0.7）过氧化物作为 CO 氧化催化剂的性能。

具有透辉石型结构的混合氧化物（ABO3）具有良好的催化特性，可用于大气污染控制领域。在这项工作中，我们合成了一系列 BaxMnO3（x = 1、0.9、0.8 和 0.7）样品，并对其进行了表征和测试，在与上一代汽车内燃机排气条件相近的条件下，将其用作一氧化碳氧化反应催化剂。在 CO-TPRe 测试中，观察到所有样品都具有 CO 氧化催化剂的活性，其中 Ba0.7MnO3（B0.7M）的活性最高，因为它具有最多的氧空位（作为 CO 氧化的活性位点）和 Mn (IV)，具有最高的还原性和最佳的氧化还原特性。B0.7M 在 300 °C 的反应过程中也表现出很高的稳定性，尽管在第二个连续反应周期中实现的 CO 转化率略低。这种性能似乎与锰（IV）/锰（III）比率的降低有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nanomaterials NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

8.50

自引率

9.40%

发文量

3841

审稿时长

14.22 days

期刊介绍： Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.