2D versus 3D MFI zeolite: The effect of Si/Al ratio on the accessibility of acid sites and catalytic performance

Ruicong Wei, Hong Yang, Jason Anthony Scott, Kondo Francois Aguey-Zinsou, Dongke Zhang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Through the synthesis of 2D MFI zeolite samples of Si/Al ratio ranged from 13 to 74 with inter-crystalline mesoporosity and their reference 3D counterparts, we have systematically studied and revealed the impact of Si/Al ratio on the inter-dependence of core intrinsic properties of structural porosity and acidity. It is apparent that mesopores in the 2D MFI zeolite play a critical role, dictating the accessibility and distribution of specific acid sites. It was found that, compared to their 3D counterparts, the 2D samples possess a three-times larger accessible surface area owing to the mesopores. Although having a slightly lower total number of acid sites, the 2D samples enjoy a higher percentage of accessible strong acid sites and weak Lewis acid sites. Consequently, in three selected liquid phase reactions, which had different acidity demands and molecular diffusion constraints, the 2D samples demonstrated much higher catalytic activities and resistance to deactivation. This study has, for the first time, established the relationship between Si/Al ratio and acidity for the 2D MFI zeolite, thus enabling rational selection of a Si/Al ratio for a targeted application.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalMaterials Today Chemistry
Volume8
DOIs
Publication statusPublished - 1 Jun 2018

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Zeolites
Acidity
Acids
Lewis Acids
Catalyst activity
Porosity
Crystalline materials
Liquids

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abstract = "Through the synthesis of 2D MFI zeolite samples of Si/Al ratio ranged from 13 to 74 with inter-crystalline mesoporosity and their reference 3D counterparts, we have systematically studied and revealed the impact of Si/Al ratio on the inter-dependence of core intrinsic properties of structural porosity and acidity. It is apparent that mesopores in the 2D MFI zeolite play a critical role, dictating the accessibility and distribution of specific acid sites. It was found that, compared to their 3D counterparts, the 2D samples possess a three-times larger accessible surface area owing to the mesopores. Although having a slightly lower total number of acid sites, the 2D samples enjoy a higher percentage of accessible strong acid sites and weak Lewis acid sites. Consequently, in three selected liquid phase reactions, which had different acidity demands and molecular diffusion constraints, the 2D samples demonstrated much higher catalytic activities and resistance to deactivation. This study has, for the first time, established the relationship between Si/Al ratio and acidity for the 2D MFI zeolite, thus enabling rational selection of a Si/Al ratio for a targeted application.",
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2D versus 3D MFI zeolite : The effect of Si/Al ratio on the accessibility of acid sites and catalytic performance. / Wei, Ruicong; Yang, Hong; Scott, Jason Anthony; Aguey-Zinsou, Kondo Francois; Zhang, Dongke.

In: Materials Today Chemistry, Vol. 8, 01.06.2018, p. 1-12.

Research output: Contribution to journalArticle

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