Synthesis of mesoporous molecular sieve Al-MCM-41 in ammonia water and its characterization

The mesoporous molecular sieve Al-MCM-41 is prepared in ammonia water by hydrothermal crystallization,using cetyltrimethyl ammonium bromide(CTABr) as structural template agent,tetraethyl orthosilioate(TOES) as silica source and aluminum chlorhydrexusp(AlCl3·6H2O) as aluminum source.The effects of the ratio of reaction substances and the synthesis conditions on the crystal structure of Al-MCM-41 are studied by X-ray diffraction characterization.The synthesized samples are characterized by nitrogen adsorption and infrared spectra analysis.The results show that the mesoporous molecular sieve of high crystallinity,uniform mesopore distribution and great specific surface area can be synthesized when the ammonia concentration of the reaction system is 5~10 mol/L,the substance amount ratio of CTABr to TOES is 0.3,and the crystallizing time is 72 h at 120 ℃.