Photoassisted catalysis is a novel and attractive means of obtaining value-added chemicals. Photocatalytic reactions occur on the surface of photocatalyst particles and, as a consequence, it is necessary to maximize exposure of the catalyst to the radiation. Irradiation efficiency can be improved by using a fluidized bed to enhance photon and mass transfer; compared with fixed-bed reactors this results in better use of irradiation and favours adsorption and desorption phenomena between reactants and photocatalysts. In this work formation of styrene from ethylbenzene was investigated on sulfated MoO x /γ-Al2O3 catalysts in a gas–solid bi-dimensional photocatalytic fluidized-bed reactor with high illumination efficiency. Photocatalytic tests showed that for all the catalysts the only product detected was styrene (100 % selectivity). The highest photoactivity was obtained by use of a catalyst with nominal loading 8 wt% MoO3 and 2.4 wt% SO4.
Research on Chemical Intermediates – Springer Journals
Published: Nov 30, 2012
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