Catalytic Cracking Deposition of Methyldiethoxysilane for Modification of Zeolitic Pores in MFI/伪-Al2O3 Zeolite Membrane with H+ Ion Exchange Pretreatment
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- 作者：Zhou Hong ; Zaijuan Wu ; Yuting Zhang ; Xuehong Gu
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2013
- 出版时间：September 11, 2013
- 年：2013
- 卷：52
- 期：36
- 页码：13113-13119
- 全文大小：441K
- 年卷期：v.52,no.36(September 11, 2013)
- ISSN：1520-5045
文摘
Catalytic cracking deposition (CCD) of methyldiethoxysilane (MDES) can be used to tune the zeolitic pores over MFI zeolite membranes for H2/CO2 separation. CCD of MDES over MFI zeolite was investigated to reveal the catalytic cracking behavior of silane. The cracking products were found to be strongly influenced by cracking temperature and acid sites. The increases of temperature and acid sites were beneficial to CCD of MDES in the zeolitic pores, which could effectively reduce the pore size of zeolite. H+ ion exchange on MFI zeolite membranes has been adopted to increase acid sites in the membrane layer. The membranes were further modified by on-stream CCD of MDES to improve H2 selectivity. The achieved H2 selectivity over ion-exchanged membranes was much higher than that for MFI zeolite membranes without ion exchange. Typically, an ion-exchanged membrane after CCD modification possessed an H2/CO2 separation factor of 42.6 and H2 permeance of 2.82 脳 10鈥? mol/m2路s路Pa at 500 掳C.