Journal of Porous Materials

, Volume 20, Issue 5, pp 1217–1224 | Cite as

Improvement of vapor-phase silylation and thermal stability of silylated MCM-22 zeolite

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Abstract

The method of vapor-phase silylation over as-made MCM-22 was improved through the replacement of deionized water with NaOH solution that absorbed HCl produced during the vapor-phase silylation. Also, the thermal stability of silylated MCM-22 was investigated by X-ray diffraction, N2 adsorption–desorption, pyridine adsorption and desorption followed by infrared measurement and nuclear magnetic resonance techniques. The results showed that this improvement was beneficial for dichlorodimethylsilane molecules to enter the interlayer of MCM-22 zeolite to form pillaring structure. Both the interlayer pillaring structure and acidity of silylated MCM-22 varied with increasing thermal treatment temperature from 600 to 750 °C. Specifically, the interlayer pillaring Si groups were thermally stable below 650 °C, and damaged gradually with the increase of thermal treatment temperature from 650 to 750 °C, leading to gradual decrease of the specific surface area and volume corresponding to interlayer supercages. At 750 °C, the interlayer pillaring structure was destroyed completely, whereas the MWW structure was still maintained well. As to the variations of acid sites with thermal treatment temperature, different trend was observed. The amount of weak and strong Brönsted acid sites, as well as that of strong Lewis acid sites decreased gradually with increasing thermal treatment temperature to 650 °C, but remained almost unchanged when the temperature was further increased to 750 °C.

Keywords

MWW Vapor-phase silylation Thermal stability Pillaring structure 
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Notes

Acknowledgments

This work was supported by Ministry of Science and Technology of China through the National Key Project of Fundamental Research (Grant No. 2009CB623501).

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1. State Key Laboratory of Catalysis, Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianPeople’s Republic of China
  2. 2.University of Chinese Academy of SciencesBeijingPeople’s Republic of China

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