膜科学与技术

甲基官能化MCM-48分子筛的制备与表征

作者：廖年礁，范益群

单位：南京工业大学化学化工学院, 材料化学工程国家重点实验室, 南京210009

关键词： MCM-48分子筛; 甲基三甲氧基硅烷; 甲基官能化; 水热稳定性

出版年,卷(期):页码： 2012,32(3):17-21

摘要：

以甲基三甲氧基硅烷为偶联剂,用化学接枝法对MCM-48分子筛进行改性,制备了甲基官能化的MCM-48分子筛. 利用FT-IR、XRD、低温N2吸附/脱附等手段对产物进行结构和性能分析. 实验结果表明,硅甲基取代了MCM-48分子筛表面和孔道内羟基,成功接枝到MCM-48表面上,膜孔径、比表面积及孔体积均减小,但MCM-48保留原有立方有序结构. MCM-48分子筛甲基硅烷化改性后表面疏水性提高,水热稳定性提高.

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 remains the cubic ordered mesoporous structure. The hydrothermal stability and hydrophobicity of MCM-48 molecular sieve were improved by the silylation.

廖年礁(1985-),男, 江苏扬州人, 硕士, 从事介孔分子筛膜的制备与应用. ?通讯联系人, E-mail: yiqunfan@njut.edu.cn

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