Citation: GAO Ningning, XIE Sujuan, LIU Shenglin, LIU Kefeng, LI Xiujie, XU Longya. Vapor-phase silylation of MCM-22 zeolite with various SiO₂/Al₂O₃ molar ratios[J]. Chinese Journal of Catalysis, ;2013, 34(3): 612-619. doi: 10.3724/SP.J.1088.2013.20932 shu

Vapor-phase silylation of MCM-22 zeolite with various SiO₂/Al₂O₃ molar ratios

GAO Ningning ^a,b ,
XIE Sujuan ^a,, ,
LIU Shenglin ^a ,
LIU Kefeng ^a,b ,
LI Xiujie ^a ,
XU Longya ^a

1.
a Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;

Corresponding author: XIE Sujuan,
Received Date: 15 September 2012
Available Online: 12 October 2012
Fund Project: 国家重点基础研究发展计划(973计划, 2009CB623501). (973计划, 2009CB623501)

MCM-22 precursor with various SiO₂/Al₂O₃ molarratios was treated by vapor-phase silylation. MCM-22 zeolite and its products of vapor-phase silylation were characterized by X-ray diffraction, solid state nuclear magnetic resonance, N₂ adsorption-desorption, and toluene adsorption techniques. The results showed that Si(OH)₂ pillaring structure was formed in the interlayer of MCM-22 with SiO₂/Al₂O₃ molarratios of 50-100 without extraction of framework aluminum through vapor-phase silylation, resulting in the expansion of interlayer distance and the increase of micropore volume. The N₂ adsorption-desorption isotherms of MCM-22 zeolite before and after silylation were analyzed by the density functional theory, and the specific surface area and pore volume of 10 member ring (10 MR) micropores and those of the supercage system were successfully obtained. As a result of vapor-phase silylation, the specific surface area and pore volume of the supercage system increased, while those of 10 MR micropores decreased. The equilibrium adsorption amount of toluene over MCM-22 zeolite with various SiO₂/Al₂O₃ molar ratios was enhanced after vapor-phase silylation.
- MWW structure,
- MCM-22 zeolite,
- silylation,
- interlayer expansion,
- density functional theory
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沈阳化工大学材料科学与工程学院沈阳 110142

Vapor-phase silylation of MCM-22 zeolite with various SiO2/Al2O3 molar ratios

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Vapor-phase silylation of MCM-22 zeolite with various SiO₂/Al₂O₃ molar ratios