甲烷在 Mn-Na2WO4/SiO2 氧化耦合过程中的反应点火

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2024-10-10 DOI:10.1016/j.cattod.2024.115097

Vitor Duarte Lage , Antônio José de Almeida , Tahyná Fontoura , Normando Jesus , José Carlos Pinto , Henrique Pacheco

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引用次数: 0

摘要

本研究采用基准 Mn-Na2WO4/SiO2 催化剂研究甲烷氧化偶联（OCM）作为 CH4 升级的可行解决方案。评估了空间速度对催化性能和点火反应的影响。实验催化测试表明，空间速度与 C2+ 产物产率之间存在复杂的关系，当反应温度达到约 700 ℃ 时，会出现自燃行为。结果表明，催化剂床层与流动气体之间的温差（ΔT）随进料流速的增加而增大，随催化剂床层的稀释而减小（随催化剂装填量的增加而增大），这使得反应可以在较低温度下点燃。本研究揭示了反应条件与点火行为之间的相互作用，为优化 OCM 工艺和催化剂开发提供了宝贵的见解。

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Reaction ignition during the oxidative coupling of methane over Mn–Na2WO4/SiO2

The present study investigates the oxidative coupling of methane (OCM) as a viable solution for CH₄ upgrading with the benchmark Mn–Na₂WO₄/SiO₂ catalyst. The effects of space velocity on catalytic performance and ignition responses were evaluated. Experimental catalytic tests revealed a complex relationship between space velocity and C2+ product yields and a self-igniting behavior when the reaction temperature reached about 700 °C. The results indicated that the temperature difference (∆T) between the catalyst bed and the flowing gas increased with the feed flow rate and decreased with dilution of the catalyst bed (increasing with catalyst loading), which can allow the reaction ignition at lower temperatures. The present study sheds light on the interplay between reaction conditions and the ignition behavior, providing valuable insights for optimization of OCM processes and catalyst development.

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.