High activity, templated mesoporous SO4/ZrO2/HMS catalysts with controlled acid site density for α-pinene isomerisation

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摘要：

Highly active mesoporous SO 4/ZrO 2/HMS (hexagonal mesoroporous silica) solid acid catalysts with tuneable sulphated zirconia (SZ) content have been prepared for the liquid phase isomerisation of α-pinene. The mesoporous HMS framework is preserved during the grafting process as evidenced by the X-ray diffraction (XRD) and porosimetry with all SO 4/ZrO 2/HMS materials possessing average pore-diameters 20 . XRD confirms the presence of a stabilized tetragonal phase of nanoparticulate ZrO 2, with no evidence for zirconia phase separation or the formation of discrete crystallites, consistent with a uniform and highly dispersed SZ coating. The activity towards α-pinene isomerisation scales linearly with Zr loading, while the specific activities are an order of magnitude greater than attainable by conventional methodologies (1 versus 0.08 mol h 1 g Zr 1).

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关键词：

Green chemistry Solid acids Mesoporous materials Hexagonal mesoporous silica Sulphated zirconia SO 4/ZrO 2 α-Pinene isomerisation Terpenes