The role of Li2CO3 promoter and steam in increasing C2H4/C2H6 selectivity in chemical looping oxidative coupling of CH4 over Mn-Na2WO4/support catalysts

IF 4.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

Frontiers of Chemical Science and Engineering Pub Date : 2025-05-19 DOI:10.1007/s11705-025-2571-0

Jianshu Li, Juan Chen, Anna Zanina, Vita A. Kondratenko, Henrik Lund, Wen Jiang, Hanyang Zhou, Yuming Li, Guiyuan Jiang, Evgenii V. Kondratenko

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Abstract

The main challenge in the oxidative coupling of methane to C₂H₆/C₂H₄ (C₂-hydrocarbons) lies in the low selectivity to the desired products due to their high reactivity to form carbon oxides. Herein, we report that the selectivity in chemical looping oxidative coupling of methane over supported Mn-Na₂WO₄-based catalysts can be significantly increased by catalyst promotion with Li₂CO₃ and performing the reaction with co-fed steam. The selectivity reaches 89% (about 60% C₂H₄ selectivity) at a methane conversion of 19%. The best-performing catalyst showed durable within 90 reaction/reoxidation cycles. With the aid of sophisticated catalyst characterization studies combined with temporal analysis of products, the origins of the enhancing effects of the promoter and steam have been elucidated and can be applied for the development of selective catalysts in various alkane oxidation reactions.

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在Mn-Na2WO4/载体催化剂上CH4化学环氧化偶联过程中，Li2CO3促进剂和蒸汽对提高C2H4/C2H6选择性的作用

甲烷与C2H6/C2H4 （c2 -碳氢化合物）氧化偶联的主要挑战在于，由于甲烷与C2H6/C2H4 （c2 -碳氢化合物）形成碳氧化物的反应活性高，对所需产物的选择性低。本文报道了用Li2CO3催化剂促进甲烷在负载型mn - na2wo4催化剂上进行化学环氧化偶联的选择性，并与共馈蒸汽进行反应。甲烷转化率为19%，选择性达到89% （C2H4选择性约60%）。性能最好的催化剂具有90次反应/再氧化循环的耐久性。通过复杂的催化剂表征研究，结合产物的时间分析，阐明了促进剂和蒸汽增强作用的原因，可用于开发各种烷烃氧化反应的选择性催化剂。

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

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.