Abstract
The performances of a gas‐solid two‐dimensional fluidized bed reactor in photocatalytic selective oxidation reactions, irradiated with traditional UV lamps or with a microscale illumination system based on UV emitting diodes (UVA‐LEDs), have been compared. In the photocatalytic oxidative dehydrogenation of cyclohexane to benzene on MoOx/TiO2‐A12O3 catalyst the use of UVA‐LEDs modules allowed to achieve a cyclohexane conversion and benzene yield higher than those obtained with traditional UV lamps. The better performances with UVA‐LEDs are due to the UVA‐LEDs small dimensions and small‐angle emittance, which allow photons beam be directed towards the photoreactor windows, reducing the dispersion outside of photoreactor or the optical path length. As a consequence, the effectively illuminated mass of catalyst is greater. We have found that this illumination system is efficient for photo‐oxidative dehydrogenation of cyclohexane to cyclohexene on sulphated MoOx/γ‐A12O3 and ethanol to acetaldehyde on VOx/TiO2.
Highlights
Heterogeneous photocatalysis is the subject of an increasing interest during the last twenty years
We have found that this illumination system is efficient for photo-oxidative dehydrogenation of cyclohexane to cyclohexene on sulphated MoOx/γ-A12O3 and ethanol to acetaldehyde on VOx/TiO2
Band gap energy eV 3.4 2.5 3.3 and with a microscale illumination system based on UV emitting diodes (UVA-LEDs) have been compared for the oxidative dehydrogenation of cyclohexane to benzene as probe reaction
Summary
Heterogeneous photocatalysis is the subject of an increasing interest during the last twenty years. A challenging research topic is the synthesis and production of chemicals by partial photo-oxidation reactions by molecular oxygen under mild conditions [1] In this context photocatalysis can lead to more sustainable processes by increasing both reactivity and selectivity towards the desired products because of mild operating conditions, that are, low temperature and pressure [2]. Microscale illumination systems are a promising solution [2] This type of illumination is realized mainly by irradiating the photoreactor with UV emitting diodes (UVA-LEDs) device [12,13,14]. Band gap energy eV 3.4 2.5 3.3 and with a microscale illumination system based on UV emitting diodes (UVA-LEDs) have been compared for the oxidative dehydrogenation of cyclohexane to benzene as probe reaction. The effectiveness of the device in photocatalytic oxidative dehydrogenation both in cyclohexane to cyclohexene and in ethanol to acetaldehyde was evaluated
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