Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, PR China.
Bioresour Technol. 2010 Oct;101(19):7224-30. doi: 10.1016/j.biortech.2010.04.075. Epub 2010 May 18.
MSU-S((BEA)) and MSU-S((Y)) mesoporous molecular sieves with different Si/Al ratios were prepared and characterized by XRD, XRF, N(2) adsorption, (27)Al MAS NMR, NH(3)-TPD and 2,6-di-tert-butyl-pyridine adsorption. Their catalytic behavior for the liquid phase isomerization of alpha-pinene has been investigated and compared with conventional zeolites and mesoporous molecular sieves. The activity correlates well with the amount of the accessible acid sites on the catalyst surface. MSU-S((BEA)) with Si/Al ratio of 67 has the highest activity in comparison to others. Ninty-seven percent conversion of alpha-pinene and 91% yield for main products like camphene, limonene, tricylene and terpinolene can be obtained at 70 degrees C. The catalyst is stable and reusable, and the product yield is only reduced by 10% after four runs, which is probably caused by the slow dealumination in the framework wall during the reaction.
采用不同硅铝比的 MSU-S((BEA)) 和 MSU-S((Y)) 介孔分子筛，通过 XRD、XRF、N(2)吸附、(27)Al MAS NMR、NH(3)-TPD 和 2,6-二叔丁基吡啶吸附对其进行了表征。考察了它们在液相异构化α-蒎烯反应中的催化性能，并与传统沸石和介孔分子筛进行了比较。活性与催化剂表面可及酸位的量密切相关。与其他介孔分子筛相比，硅铝比为 67 的 MSU-S((BEA)) 具有最高的活性。在 70℃下，α-蒎烯转化率可达 97%，主要产物如莰烯、柠檬烯、蒈烯和松油醇的收率可达 91%。催化剂稳定且可重复使用，经过四次运行后，产物收率仅降低了 10%，这可能是由于反应过程中骨架壁中脱铝速度较慢所致。
