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Citation: SONG Wei-Ming, DENG Qi-Gang, ZHAO De-Feng. Synthesis and Characterization of Al-or La-Modified MCM-41 Hexagenal Mesoporous Molecular Sieves and Their Catalytic Activity for Ethoxylation[J]. Chinese Journal of Applied Chemistry, ;2005, 22(4): 407-411. shu

Synthesis and Characterization of Al-or La-Modified MCM-41 Hexagenal Mesoporous Molecular Sieves and Their Catalytic Activity for Ethoxylation

1.
a State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012;
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b College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar

Corresponding author: SONG Wei-Ming,
Received Date: 21 July 2004
Available Online: 13 December 2004
Fund Project: 黑龙江省自然科学基金资助项目(B9810) (B9810)

Pure silica mesoporous molecular sieve MCM-41 and those containing aluminum (Al-MCM-41) or lanthanum (La-MCM-41) with Si/Al (Si/La) mole ratios of 30:1 and 80:1 were synthesized under hydrothermal conditions with cetylpyridinium chloride (CPCl) as the surfactant and nonylphenolpolyoxyethylene ether (TX-100) as the composite template and ethyl silicate (TEOS) as the silica source in hydrochloric acid.The mesoporous materials,pure silica MCM-41,Al-MCM-41 and La-MCM-41,were characterized by means of XRD,BET,TG-DTA,FT-IR,TEM,and NH₃ adsorption-desorption (NH₃-TPD).The XRD and BET studies indicate that the calcined materials have the standard MCM-41 structure and ordered pore structure and high specific surface area.The NH₃-TPD and TG-DTA spectra indicate that all the samples prepared are rich in surface strong acid sites and of high thermal stability.Pure silica MCM-41,Al-MCM-41 and La-MCM-41 were used as catalysts in the ethyloxylation.The results show that Al-MCM-41 has higher catalytic activity than the others.Orthogonal experiment indicated that when octanol was heated with 3 equivalance of ethylene oxide (EO) at 120℃ in the presence of 5% catalyst (Al-MCM-41),the yield was 88%.The catalyst can be recycled.The reaction rate only changed a little after the catalyst was recycled three times.
- mesoporous molecular sieve,
- hydrochloric acid,
- composite template,
- ethyloxylation
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