Advance in surface characteristics of SO42-/MxOy solid superacid and its isomerization mechanisms for light alkane

doi:10.16085/j.issn.1000-6613.2015.11.013

Abstract

Abstract: Alkane isomerization is an important method to increase gasoline octane value. The surface characteristics of SO₄^2-/M_xO_y solid superacid, the formation mechanisms of acid sites and their regulatory method were described. The isomerization mechanisms of light alkanes over SO₄^2-/M_xO_y solid superacid catalyst, including the carbenium ion mechanism, monomolecular reaction mechanism, bimolecular reaction mechanism and mental-acid bifunctional catalytic mechanism were discussed in detail. Some different viewpoints on ismerization mechanisms over SO₄^2-/M_xO_y solid superacid catalysts were illustrated. In the future, it is necessary to further study the isomerization mechanism, formation of active sites and the deactivation reasons of catalysts, and to explore the modification and preparation methods for superacid, so that the catalysts with a higher activity for isomerization and more stability could be prepared. Finally, the future research emphasis on SO₄^2-/M_xO_y solid superacid catalyst was pointed out.

Key words: alkane, catalyst, SO₄^2-/M_xO_y solid superacid, reactivity, isomerization, mechanism

摘要： 烷烃异构化是提高汽油辛烷值的重要方法。本文阐述了SO₄^2-/M_xO_y型固体超强酸的表面特征及其酸中心的形成机理与调控方法。综述了SO₄^2-/M_xO_y型固体超强酸催化剂轻质烷烃异构化碳正离子机理、单分子反应机理、双分子反应机理和金属/酸性双功能催化剂催化机理。介绍了在SO₄^2-/M_xO_y型固体超强酸催化剂上异构化反应机理的不同观点。今后,需进一步深入开展轻质烷烃异构化反应机理、活性位形成及催化剂失活原因等方面的研究,探究固体超强酸催化剂的改性方法和制备方法,制备出高催化剂活性和稳定性的异构化催化剂。

关键词: 烷烃, 催化剂, SO₄^2-/M_xO_y固体超强酸, 活性, 异构化, 机理

CLC Number:

MENG Yao, LI Feng, SONG Hua. Advance in surface characteristics of SO₄^2-/M_xO_y solid superacid and its isomerization mechanisms for light alkane[J]. Chemical Industry and Engineering Progree, 2015, 34(11): 3906-3914.

孟瑶, 李锋, 宋华. SO₄^2-/M_xO_y型固体超强酸酸中心结构及其在轻质烷烃异构化反应中的机理研究进展[J]. 化工进展, 2015, 34(11): 3906-3914.

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Advance in surface characteristics of SO₄^2-/M_xO_y solid superacid and its isomerization mechanisms for light alkane

SO₄^2-/M_xO_y型固体超强酸酸中心结构及其在轻质烷烃异构化反应中的机理研究进展

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