Support effect on the chemical properties of Mn2O3/Na2WO4/MOx catalysts in the oxidative coupling of methane

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-05-12 DOI:10.1016/j.apcata.2025.120339

Jiaxin Song , Xiaoqiang Fan , Baijun Liu , Zhen Zhao

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Abstract

The high stability and excellent performance of NaWMn based catalysts in the oxidative coupling of methane (OCM) are expected to promote their industrial application. However, the selection of supports has significant impact on the OCM performance of NaWMn-based catalysts. In this work, we found that the addition of Na₂WO₄/MO_x to Mn₂O₃ can change the function of the Mn₂O₃ catalyst from methane combustion to oxidative coupling of methane, and the Mn₂O₃/NaWSi catalyst exhibits the highest performance. The isotope oxygen exchange and CH₄-TPSR results confirm that the appropriate oxygen exchange rate is beneficial for improving the catalytic performance of OCM reaction. H₂-TPR and O₂-TPD results demonstrate that the Mn₂O₃/NaWSi catalyst has moderate redox ability and can slowly release oxygen species at lower temperatures, matching the rate of methane consumption with the rate of C₂ generation.

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载体对甲烷氧化偶联Mn2O3/Na2WO4/MOx催化剂化学性质的影响

NaWMn基催化剂在甲烷氧化偶联反应（OCM）中的高稳定性和优异性能有望促进其工业应用。然而，载体的选择对纳米锰基催化剂的OCM性能有显著影响。在这项工作中，我们发现在Mn2O3中加入Na2WO4/MOx可以使Mn2O3催化剂的功能从甲烷燃烧转变为甲烷氧化偶联，并且Mn2O3/NaWSi催化剂表现出最高的性能。同位素氧交换和CH4-TPSR结果证实，适当的氧交换速率有利于提高OCM反应的催化性能。H2-TPR和O2-TPD结果表明，Mn2O3/NaWSi催化剂具有中等氧化还原能力，在较低温度下能缓慢释放氧气，甲烷消耗速率与C2生成速率相匹配。

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

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.