【摘要】 以水玻璃为硅源 ,以偏铝酸钠为铝源 ,以十六烷基三甲基溴化铵 (CTAB)为模板剂 ,合成了强酸性介孔分子筛Al MSU S及介孔 微孔分子筛Al MSU S .采用XRD ,N2 物理吸附 ,MASNMR ,FT IR ,GC MS ,TG ,TPD ,SEM和TEM等手段 ,对Al MSU S分子筛的结构、组成、酸性质和形貌等进行了表征 .考察了反应温度和压力对Al MSU S分子筛催化剂上二异丙苯裂化反应的影响 ,并就Al MSU S分子筛的酸性和孔结构在反应中的作用进行了探讨 .更多还原

【Abstract】 Al-MSU-S mesoporous molecular sieve (Al-MSU-S(me)) with high hydrothermal stability and acidity was reported recently. In this work, the Al-MSU-S(me) and the Al-MSU-S meso-microporous molecular sieve (Al-MSU-S(me-mi)) were prepared by the assembly of protozeolitic nanoclusters. When the Al content in Al-MSU-S was 2 5%～20% and 25%～33 3% respectively, the corresponding hexagonal mesoporous and meso-microporous structure was obtained. Three IR vibrational bands were observed in the range of 560～690 cm -1 , being comparable to microporous faujusite. The tetrahedral coordinated aluminum was found in all the Al-MSU-S molecular sieves, indicating that all the aluminum had entered Al-MSU-S framework. Both Al-MSU-S(me) and Al-MSU-S(me-mi) possessed medium and stronger acid sites. The acid amount of Al-MSU-S(me) increased as Al content decreased, and the acid amount of Al-MSU-S(me-mi) was much more than that of Al-MSU-S(me), and the acid strength of Al-MSU-S(me-mi) was much stronger than that of Al-MSU-S(me). The catalytic activity of Al-MSU-S in H + form was measured by diisopropylbenzene(DIPB) cracking reaction at different temperatures and pressure. Under the pressure of 0 1 MPa the Al-MSU-S(me-mi) had higher activity than the Al-MSU-S(me), while the catalytic activity of Al-MSU-S(me) increased steadily as Al content decreased.更多还原