Abstract
The effect of UV-visible photo irradiation has been investigated on the decomposition of isopropanol over V2O5. A ∼ 2.5-fold photo-enhancement in the rate of the dehydration (-H2O) reaction was observed under UV-visible photo irradiation compared to thermal heating of the catalyst. The increase in propene yield under photo irradiation is believed to be initiated from photo excitation (photo-reduction) of the V2O5 complex to [-V4+-O−] * thus, increasing surface concentration of V4+ species. The V4+ active surface species is assumed to serve as the center for adsorption of isopropanol. The observed increase in water formation along with the formation of propene suggests that the rate determining step for the dehydration reaction is desorption of water. Selectivity toward the dehydrogenation (-H2) reaction has also been measured to be ∼ 1% under UV-visible photo irradiation as compared to ∼ 15% under thermal heating of the catalyst.
Published Version
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