Solvent-Free Secondary Growth of Highly b-Oriented MFI Zeolite Films from Anhydrous Synthetic Powder

Xiaofei Lu; Yanwei Yang; Junjia Zhang; Yushan Yan; Zhengbao Wang

doi:10.1021/jacs.9b00018

Solvent-Free Secondary Growth of Highly b-Oriented MFI Zeolite Films from Anhydrous Synthetic Powder

J Am Chem Soc. 2019 Feb 20;141(7):2916-2919. doi: 10.1021/jacs.9b00018. Epub 2019 Feb 12.

Authors

Xiaofei Lu¹, Yanwei Yang¹, Junjia Zhang¹, Yushan Yan^{1

2}, Zhengbao Wang¹

Affiliations

¹ Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering , Zhejiang University , Hangzhou 310027 , P. R. China.
² Department of Chemical and Biomolecular Engineering , University of Delaware , Newark , DE19716 , United States.

PMID: 30742416
DOI: 10.1021/jacs.9b00018

Abstract

Up to date, zeolite films have been mainly fabricated by in situ crystallization, secondary growth in a solution/hydrogel, or occasionally by vapor phase transformation of dry gel. Here we demonstrate for the first time a solvent-free secondary growth method for b-oriented silica MFI zeolite films using the synthetic powder from ground anhydrous raw solids in the presence of NH₄F. Typically, precisely b-oriented MFI zeolite films are synthesized from seed layers of highly b-oriented MFI zeolite crystals in the synthetic powder of 1SiO₂:0.035TPABr:0.05NH₄F at 175 °C for 6 h. If needed, b-oriented MFI zeolite multilayer films can be acquired by changing the synthesis time or the amount of NH₄F in the synthetic powder. Compared with the traditional hydrothermal synthesis, the approach developed here may provide a new avenue for fabricating high quality zeolite films/membranes.