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Synthesis and characterization of methyl-functionalized MCM-48 molecular sieve

Yiqun Fan

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Abstract

Methyl-functionalized MCM-48 molecular sieve was prepared by grafting method using methyltrimethoxysilane as coupling agent.The prepared product was characterized by Fourier transform infrared(FT-IR),X-ray diffraction(XRD) and nitrogen adsorption-desorption.The experiment results indicated that the silyl group was substituted for the Si-OH group on the pore surface of MCM-48,and then the modified MCM-48 molecular sieve with reduced pore diameter,surface area and pore volume was successfully acquired by silylation.However,the modified MCM-48 remained the cubic ordered mesoporous structure.The hydrothermal stability and hydrophobicity of MCM-48 molecular sieve were improved by the silylation.

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What this paper is about

Methyl-functionalized MCM-48 molecular sieve was prepared by grafting method using methyltrimethoxysilane as coupling agent.The prepared product was characterized by Fourier transform infrared(FT-IR),X-ray diffraction(XRD) and nitrogen adsorption-desorption.The experiment results indicated that the silyl group was substituted for the Si-OH group on the pore surface of MCM-48,and then the modified MCM-48 molecular sieve with reduced pore diameter,surface area and pore volume was successfully acquired by silylation.However,the modified MCM-48 remained the cubic ordered mesoporous structure.The hydrothermal stability and hydrophobicity of MCM-48 molecular sieve were improved by the silylation.

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Available abstract

Methyl-functionalized MCM-48 molecular sieve was prepared by grafting method using methyltrimethoxysilane as coupling agent.The prepared product was characterized by Fourier transform infrared(FT-IR),X-ray diffraction(XRD) and nitrogen adsorption-desorption.The experiment results indicated that the silyl group was substituted for the Si-OH group on the pore surface of MCM-48,and then the modified MCM-48 molecular sieve with reduced pore diameter,surface area and pore volume was successfully acquired by silylation.However,the modified MCM-48 remained the cubic ordered mesoporous structure.The hydrothermal stability and hydrophobicity of MCM-48 molecular sieve were improved by the silylation.

Key concepts: Molecular sieve, Methyltrimethoxysilane, Silylation, Mesoporous material, MCM-41, Materials science, Fourier transform infrared spectroscopy, Grafting

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