Synthesis of Stable Mesoporous Molecular Sieve From Kaolin

Mesoporous molecular sieve was hydrothermally synthesized using kaolin and sodium silicate as silicon sources.The sam-ples obtained were characterized by X-ray diffraction,Fourier transform infrared spectroscopy,thermal gravimetric?differential scan-ning 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 mo-lecular sieve possessed good thermal and hydrothermal stabilities.