Chemical Industry and Engineering Progress ›› 2019, Vol. 38 ›› Issue (10): 4564-4573.DOI: 10.16085/j.issn.1000-6613.2018-2383

• Industrial catalysis • Previous Articles     Next Articles

Catalyst and reaction mechanism for direct catalytic oxidation of methane to methanol

Feng XU(),Fan LI,Lihua ZHU,Yu KANG   

  1. School of Safety Engineering and Technology, Heilongjiang University of Science and Technology, Harbin 150022, Heilongjiang, China
  • Received:2018-12-10 Online:2019-10-05 Published:2019-10-05
  • Contact: Feng XU

甲烷直接催化氧化制甲醇催化剂及反应机理

徐锋(),李凡,朱丽华,康宇   

  1. 黑龙江科技大学安全工程学院,黑龙江 哈尔滨 150022
  • 通讯作者: 徐锋
  • 作者简介:徐锋(1979—),男,博士,副教授,研究方向为甲烷催化氧化。E-mail:xufeng79_79@163.com
  • 基金资助:
    国家自然科学基金(51374098);黑龙江省自然科学基金(E2018053)

Abstract:

The catalysts and the catalytic mechanisms are the keys to the direct catalytic oxidation of methane to methanol. In this paper, platinum catalyst, palladium catalyst, rhodium catalyst, Fe-modified zeolite catalyst, Cu-modified zeolite catalyst and modified metal-organic framework catalyst for methane to methanol as well as the corresponding catalytic mechanism were reviewed. The results showed that methane to methanol catalyzed by platinum catalysts of K2PtCl4, Pt(bpym)Cl2 and Pt(bipy)Cl2 is electrophilic substitution reaction, while that by Pd(OAc)2 of palladium catalyst system in aqueous solution of CF3COOH is through multi-step electron transport chain and that by Pd/C in acetic acid aqueous solution is the result of the interaction of electrophilic substitution and oxidation of reactive oxygen species. Through the interaction of monovalent Rh anchored in the carrier channel with CO, H2O and O2, Rh/ZSM-5 and Rh/TiO2 in rhodium catalyst system converts methane into methanol. Regarding the Fe-modified zeolite catalyst, Cu-modified zeolite catalyst and modified metal-organic framework material catalyst, free radical reactions such as homolysis and heterolysis works. Design and preparation of catalysts for highly activating methane molecule and inhibiting deep oxidation of methanol and in-depth study of its catalytic mechanism are still the focus of future research.

Key words: methane, methanol, oxidation, catalyst, reaction mechanism

摘要:

研究甲烷合成甲醇的催化剂及催化机理是甲烷直接催化氧化制甲醇的关键。本文综述了甲烷合成甲醇的Pt系催化剂、Pd系催化剂、Rh系催化剂、Fe改性沸石催化剂、Cu改性沸石催化剂、改性金属有机框架材料催化剂以及相应的催化机理。结果表明,Pt系催化剂中K2PtCl4、Pt(bpym)Cl2、Pt(bipy)Cl2催化甲烷制甲醇机理为亲电取代反应。Pd系催化剂中Pd(OAc)2在CF3COOH水溶液中通过多步电子传递链将甲烷转化为甲醇;Pd/C在乙酸水溶液中催化甲烷合成甲醇是亲电取代和活性氧物种氧化两种机理共同作用的结果。Rh系催化剂中的Rh/ZSM-5、Rh/TiO2通过锚定在载体孔道内的一价Rh与CO、H2O和O2作用将甲烷转化为甲醇。Fe、Cu改性沸石催化剂及改性金属有机框架材料催化剂通过均裂、异裂等自由基反应转化甲烷得到甲醇。指出研究高效活化甲烷分子和抑制甲醇深度氧化催化剂的设计、制备及深入探究其催化机理仍然是今后的研究重点。

关键词: 甲烷, 甲醇, 氧化, 催化剂, 反应机理

CLC Number: 

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