Zeolites are effective catalyst for many reactions of industrial interest, most of them carried out in the vapor phase. However, in some cases the upgrading of biomass-derived compounds requires reactions conducted in the aqueous liquid phase at temperatures in the range 150-250�C. However, under these conditions, the crystalline framework of zeolites tends to collapse. Reducing the hydrophilicity of zeolites enhances their stability in water; however, in general this approach requires sacrificing Br�nsted acid sites.  An alternative method to increase hydrophobicity without reducing the density of acid sites is the silylation of the external surface with organosilanes.  Using XRD, SEM, HRTEM, DRIFTS, we have shown that the thermal stability of HY zeolites in hot liquid water can be greatly improved by functionalizing the external surface with organosilanes. This approach can have a significant impact in the application of HY zeolites in the conversion of biomass in aqueous liquid systems.  In this case, we discuss alcohol dehydration and alkylation of m-cresol and 2-propanol in the liquid phase.

Improved thermal stability of silylated HY zeolites during reaction in water/oil emulsions

245th National Meeting (2013)

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