Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (9): 2934.doi: 10.7503/cjcu20210092

• Physical Chemistry • Previous Articles     Next Articles

Effects of Substrate Surface Properties and Precursor Chemical Environment on In⁃situ Oriented Construction of Titanium Silicalite Zeolite Membranes

LI Yichuan1(), ZHU Guofu1, WANG Yu1, CHAI Yongming1, LIU Chenguang1, HE Shengbao1,2   

  1. 1.State Key Laboratory of Heavy Oil Processing,College of Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,China
    2.PetrochemicalResearch Institute,PetroChina,Beijing 102206,China
  • Received:2021-02-08 Online:2021-09-10 Published:2021-09-08
  • Contact: LI Yichuan E-mail:liyichuan@upc.edu.cn
  • Supported by:
    the National Natural Science Youth Fund Project of China(21706289);the Fundamental Research Funds for the Central Universities and the Development Fund of State Key Laboratory of Heavy Oil Processing, China(20CX02211A)

Abstract:

b-Oriented MFI zeolite membranes can significantly promote the molecular transport efficiency, so they are widely used in the field of mixture separation and catalysis. Although the traditional in?situ hydrothermal crystallization method is mature, it is still difficult to control the b-orientation growth of the membrane. In this paper, the effects of surface physicochemical properties, precursor ratio and crystallization conditions on the b-orientation growth of titanium silicalite zeolite membranes on 304 stainless steel substrate were systematically studied by classical in?situ hydrothermal crystallization method. The results show that the hydroxyl groups on the surface of TiO2 interlayer can directionally induce the adsorption of zeolite grains, and then improve the b-orientation of the membrane. At the same time, the content of TPAOH and H2O in the precursor solution has a significant effect on the grain size and the directional growth of the membrane, that is, the high b-oriented titanium silicalite zeolite membranes can be formed only under the appropriate alkalinity. The results of this study have a certain guiding effect on the in?situ adjustment of the orientation of the titanium silicalite zeolite membranes.

Key words: Titanium silicalite zeolite membrane, b-Axis orientation, Surface property, Precursor liquid environment, In?situ hydrothermal crystallization

CLC Number: 

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