以硅酸钠为硅源、偏铝酸钠为铝源、十六烷基三甲基溴化铵为模板剂,两步水热法合成出了有序性好、热稳定性与水热稳定性高的介孔分子筛.XRD、AFM、TG、RT-IR、BET比表面和孔径测定以及热稳定性和水热稳定性研究表明:制得了粒径为30～50nm的纳米级介孔分子筛,并且所制备介孔分子筛的比表面积大于800m2/g;在1123K以上热稳定性好;100℃水热处理10天后有序性、孔径和比表面都没有明显的变化.负载Pt样品对苯加氢反应的催化性能研究表明,反应温度250℃、3.0MPa下,载Pt样品的苯加氢活性和选择性都接近100%,连续反应30h催化活性没有明显的降低.
Mesoporous molecular sieve is prepared hydrothermally by two-step method with materials of cetyltrimethyl ammonium bromide(CTAB)as a template,and sodium aluminate(NaAIO2)and sodium silicate(Na2SiO3·9H2 O) as aluminium and silicon sources, respectively. The mesoporous molecular sieves have good ordering, high thermal and hydrothermal stabilities. The as-prepared samples are characterized by powder X-ray diffraction(XRD),atomic force microscope(AFM), fourier transform infrared spectroscopy (FT-IR), nitrogen adsorption experiments. Particle size distribution ranges over 30～50nm, BET surface area is more than 800 m2/g, thermal stability is higher than 1123K and there ars no clear changes in order degree, pore size,and surface area of the mesoporous molecular sieve after hydrothermal treanment at 373K for 10 days. The activity and selectivity of benzene hydrogenation to cyclohexane by mesoporous molecular sieve-supported Pt are up to 100%. The calalytic activity does not decline obviously in a reaction period of 30 h.
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