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MSU-S mesoporous materials: An efficient catalyst for isomerization of α-pinene
- Wang, Jie, Hua, Weiming, Yue, Yinghong, Gao, Zi
- Bioresource technology 2010 v.101 no.19 pp. 7224-7230
- adsorption, catalysts, isomerization, nuclear magnetic resonance spectroscopy, sieves, terpinolene, zeolites
- MSU-S₍BEA₎ and MSU-S₍Y₎ mesoporous molecular sieves with different Si/Al ratios were prepared and characterized by XRD, XRF, N₂ adsorption, ²⁷Al MAS NMR, NH₃-TPD and 2,6-di-tert-butyl-pyridine adsorption. Their catalytic behavior for the liquid phase isomerization of α-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 α-pinene and 91% yield for main products like camphene, limonene, tricylene and terpinolene can be obtained at 70°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.