A Hierarchical MFI Zeolite with a Two-Dimensional Square Mesostructure

Xuefeng Shen; Wenting Mao; Yanhang Ma; Dongdong Xu; Peng Wu; Osamu Terasaki; Lu Han; Shunai Che

doi:10.1002/anie.201710748

A Hierarchical MFI Zeolite with a Two-Dimensional Square Mesostructure

Angew Chem Int Ed Engl. 2018 Jan 15;57(3):724-728. doi: 10.1002/anie.201710748. Epub 2017 Dec 14.

Authors

Xuefeng Shen¹, Wenting Mao¹, Yanhang Ma², Dongdong Xu³, Peng Wu⁴, Osamu Terasaki², Lu Han^{1

5}, Shunai Che^{1

5}

Affiliations

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 School of Physical Science and Technology, ShanghaiTech University, 100 Haike Road, Pudong, Shanghai, 201210, P.R. China.
³ School of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University, Nanjing, 210023, P.R. China.
⁴ 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.
⁵ School of Chemical Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, P.R. China.

PMID: 29193601
DOI: 10.1002/anie.201710748

Abstract

A conceptual design and synthesis of ordered mesoporous zeolites is a challenging research subject in material science. Several seminal articles report that one-dimensional (1D) mesostructured lamellar zeolites are possibly directed by sheet-assembly of surfactants, which collapse after removal of intercalated surfactants. However, except for one example of two-dimensional (2D) hexagonal mesoporous zeolite, no other zeolites with ordered 2D or three-dimensional (3D) mesostructures have been reported. An ordered 2D mesoporous zeolite can be templated by a cylindrical assembly unit with specific interactions in the hydrophobic part. A template molecule with azobenzene in the hydrophobic tail and diquaternary ammonium in the hydrophilic head group directs hierarchical MFI zeolite with a 2D square mesostructure. The material has an elongated octahedral morphology, and quaternary, ordered, straight, square channels framed by MFI thin sheets expanded along the a-c planes and joined with 90° rotations. The structural matching between the cylindrical assembly unit and zeolite framework is crucial for mesostructure construction.

Keywords: 2D square mesostructures; electron microscopy; intergrowth; mesoporous zeolites; tetragonal crystals.

Publication types

Research Support, Non-U.S. Gov't