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Recent advances in engineering montmorillonite into catalysts and related catalysis

https://www.tandfonline.com/doi/abs/10.1080/01614940.2021.1995163?journalCode=lctr20


Catalysis Reviews 
Science and Engineering
 
Recent advances in engineering montmorillonite into catalysts and related catalysis
Wei Jun Huang
,
Jia Hui Liu
,
Qi Ming She
,
Jian Qiang Zhong
,
George E. Christidis
 &
Chun Hui Zhou*

Received 17 Feb 2021, Accepted 12 Oct 2021, Published online: 25 Nov 2021

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https://doi.org/10.1080/01614940.2021.1995163

ABSTRACT
Montmorillonite, a ubiquitous clay mineral, has been engineered into a variety of porous and nanostructured catalysts, owing to its peculiar layered structure with characteristic surface and intercalation chemistry. Such a class of catalysts have continuously received considerable attention in both science and industry. This review examines recent advance in engineering montmorillonite into metal ion-exchanged montmorillonite catalysts, acid-activated montmorillonite catalysts, organo-montmorillonite catalysts, pillared interlayered montmorillonite catalysts and montmorillonite-supported catalysts. The former two types of montmorillonite-based catalysts have been used in the catalytic cracking, dehydration, hydrolysis, esterification, polymerization, alkylation, and Fischer-Tropic synthesis. The introduction of oxide pillars in the interlayer space of montmorillonite and the immobilization of metal oxides or zero-valent metals on the surface of montmorillonite allow montmorillonite to be used in the catalytic oxidation, reduction, isomerization and coupling reactions. Currently, the role of montmorillonite in acid catalysis, redox catalysis, and free radical catalysis have been partly revealed. The effect of the structures and the active sites of modified montmorillonite on its catalytic performance need to be investigated in more detail. Future work is suggested to focus on solving engineering problems and exploring novel catalytic applications of montmorillonite, in particular exfoliated montmorillonite nanolayers.

KEYWORDS: 

montmorillonite   layered structure      porous material    ion exchange    pillared clay    heterostructure
 
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