Issue 15, 2015

In situ growth and assembly of microporous aluminophosphate nanosheets into ordered architectures at low temperature and their enhanced catalytic performance

Abstract

A low-temperature strategy to fabricate hierarchical aluminophosphate-based molecular sieves has been developed without the assistance of surfactants. The facile synthesis results in cylinder-like SAPO-5 (AFI) composed of oriented attached nanosheets with a thickness of 40–100 nm. The main exposed surface of the nanosheets is revealed by the SAED pattern to be the {001} plane, implying a short path for molecular diffusion in the one-dimensional 12-membered ring channel. Investigation on the crystallization process demonstrates that low temperature retards the crystal growth along the c-direction in SAPO-5 and the ordered architecture forms via a nanosheet formation and oriented attachment process. The aggregated morphology of SAPO-5 is template-dependent, which may be modified/changed by varying the template in the system. The low-temperature strategy is also successfully extended to the preparation of metal-containing aluminophosphate molecular sieves. The obtained MeAPO-5 (Me = Co, Mn, and Cr) and a novel CHA/AEI intergrowth CoAPO molecular sieve also possess hierarchical structures with nanosheet-assembled morphology. Remarkably, the present self-assembled AFI crystals exhibit an obvious improvement in catalytic reactions. This facile method provides a new way for the long-range organization of nanosized building blocks to fabricate hierarchical nanostructures.

Graphical abstract: In situ growth and assembly of microporous aluminophosphate nanosheets into ordered architectures at low temperature and their enhanced catalytic performance

Supplementary files

Article information

Article type
Paper
Submitted
03 Feb 2015
Accepted
18 Feb 2015
First published
18 Feb 2015

J. Mater. Chem. A, 2015,3, 7741-7749

Author version available

In situ growth and assembly of microporous aluminophosphate nanosheets into ordered architectures at low temperature and their enhanced catalytic performance

B. Gao, P. Tian, M. Li, M. Yang, Y. Qiao, L. Wang, S. Xu and Z. Liu, J. Mater. Chem. A, 2015, 3, 7741 DOI: 10.1039/C5TA00888C

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