以高岭土为原料合成高稳定性介孔分子筛(英文)

Synthesis of Stable Mesoporous Molecular Sieve From Kaolin

以廉价的高岭土和硅酸钠为硅源,用水热法合成了介孔分子筛。采用X射线粉末衍射、Fourier变换红外光谱、热分析、N2物理吸附、扫描电子显微镜和透射电子显微镜对样品进行了表征,同时研究了样品的热稳定性和水热稳定性。结果表明:长程有序的介孔分子筛平均孔径约为2.75nm;经900℃焙烧3 h或100℃水热处理6 d,样品的介孔结构不被破坏,说明样品具有高的热稳定性和水热稳定性。

Mesoporous molecular sieve was hydrothermally synthesized using kaolin and sodium silicate as silicon sources. The sam- pies obtained were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermal gravimetric-differential scanning calorimeter, N2 physical adsorption, scanning electron microscopy （SEM） and transmission electron microscopy, respectively. Also, the thermal and hydrothermal stabilities of the sample were evaluated. The result showed that the long-range and ordered mesoporous molecular sieves with the average pore size of 2.75 nm were successfully synthesized. The mesoporous framework was still maintained even after calcination at 900 ℃ for 3 h and hydrothermally treatment at 100 ℃ for 6 d. The resultant mesoporous molecular sieve possessed good thermal and hydrothermal stabilities.