A simple method for healing nonzeolitic pores of MFI membranes by hydrolysis of silanes

被引：27

作者：

Hong, Zhou ^{[1
]}

Zhang, Chun ^{[1
]}

Gu, Xuehong ^{[1
]}

Jin, Wanqin ^{[1
]}

Xu, Nanping ^{[1
]}

机构：

[1] Nanjing Univ Technol, State Key Lab Mat Oriented Chem Engn, Coll Chem & Chem Engn, Nanjing 210009, Jiangsu, Peoples R China

来源：

JOURNAL OF MEMBRANE SCIENCE | 2011年 / 366卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

MFI type; Zeolite membrane; Xylene separation; Modification; Silane; ZEOLITE MEMBRANES; PERMEATION CHARACTERISTICS; SILICALITE MEMBRANES; GAS PERMEATION; SEPARATION; XYLENE; PERVAPORATION; MIXTURES; GROWTH;

D O I：

10.1016/j.memsci.2010.10.049

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In this paper, we proposed a simple method with hydrolysis of silanes to heal nonzeolitic pores of pure silica MFI (silicalite) zeolite membranes. Three silane precursors, tetraethoxysilane (TEOS), tetramethoxysilane (TMOS) and dimethoxydimethylsilane (DMDS) were used for membrane modification at room temperature. The modified membranes were evaluated by the separation of p-/o-xylene mixture. It was found that the hydrolysis of silanes in nonzeolitic pores could obviously improve separation performance of the MFI zeolite membranes. The modification results of nonzeolitic pores were related to the silane precursors with different physical-chemical properties and molecular kinetic diameter. Compared with TEOS and TMOS, DMDS was more suitable as a precursor for healing nonzeolitic pores. For a zeolite membrane after DMDS modification, p-/o-xylene separation factor could be increased from 2.34 to 10.84 while p-xylene flux decreased only about 12.6%. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：427 / 435

页数：9

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