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Chemistry. 2018 Dec 20;24(72):19300-19308. doi: 10.1002/chem.201804193. Epub 2018 Nov 21.

Hierarchical MFI Zeolites with a Single-Crystalline Sponge-Like Mesostructure.

Zhang Y1, Luo P2, Xu H2, Han L1,3, Wu P2, Sun H1, Che S1,3.

Author information

1
School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P.R. China.
2
Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Road, Shanghai, 200062, P.R. China.
3
School of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, P.R. China.

Abstract

Single-crystalline sponge-like MFI mesoporous zeolites (SSMZs) have been synthesized by using bolaform surfactants with an axial chiral binaphthyl core in the hydrophobic tail and triquaternary ammonium head groups, as bifunctional organic structure-directing agents (OSDAs). By changing the length of alkyl chain between a triquaternary ammonium head group and a binaphthyl group from 4 to 10 carbons, SSMZs with high specific surface area (382-434 m2  g-1 ), abundant micropore-mesopore connectivity, and uniform mesopore diameter (4-10 nm) were obtained. OSDAs with an alkyl chain length of 11 and 12 carbons led to the formation of nanorod-constructed mesoporous MFI zeolites. A geometrical matching between the cylindrical arrangement of the binaphthyl groups and the zeolitic framework is speculated to be the key factor for the formation of mesoporous zeolites. The SSMZ zeolites, with abundant mesopores beneficial for the diffusion of reactants, exhibited significantly higher catalytic efficiencies than those of the conventional ZSM-5 with a microcrystal morphology (≈1.5 μm).

KEYWORDS:

MFI Zeolite; hierarchical structure; single-crystal; sponge-like structure

PMID:
30338574
DOI:
10.1002/chem.201804193

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