Abstract
A catalytic membrane reactor with a Au–Pd catalyst, impregnated at the inner side of the membrane, was studied in the catalytic oxidation of benzyl alcohol in flow. The reactor comprised of four concentric sections. The liquid substrate flowed in the annulus created by an inner tube and the membrane. The membrane consisted of 3 layers of α-alumina and a titania top layer with 5 nm average pore size. Oxygen was fed on the outer side of the membrane, and its use allowed the controlled contact of the liquid and the gas phase. Experiments revealed excellent stability of the impregnated membrane and selectivities to benzaldehyde were on average > 95%. Increasing the pressure of the gas phase and decreasing liquid flowrates and benzyl alcohol concentration resulted in an increased conversion, while selectivities to benzaldehyde remained constant and in excess of 95%.
Highlights
High value chemicals are generally produced in batch reactors, generally leading to the generation of a large amount of waste and less control over the reaction parameters [1]
Oxygen did not have to diffuse through the liquid film inside the pores of the ceramic membrane in order to reach the catalyst region as it was happening with the packed-bed membrane reactor but it was supplied directly to the catalyst region, resulting in an improved and increased oxygen mass transfer
A catalytic ceramic membrane impregnated with a Au-Pd catalyst in its inner surface was developed and used for the continuous heterogeneously catalysed aerobic oxidation of benzyl alcohol
Summary
High value chemicals are generally produced in batch reactors, generally leading to the generation of a large amount of waste and less control over the reaction parameters [1]. We investigated benzyl alcohol oxidation in flow using a ceramic membrane packed-bed reactor with a Au-Pd/TiO2 catalyst [18]. Benzyl alcohol oxidation in a catalytic membrane reactor under flow conditions was studied. The Au/Pd catalyst was impregnated on the inner side of the ceramic membrane, the gas phase can be supplied directly to the catalyst region This can potentially reduce the mass transfer resistances encountered in packed-bed membrane reactors. This configuration where the oxidant is added continuously along the length of the reactor offers safer operation compared to batch slurry systems since gas/liquid flammable mixtures are avoided
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