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Synthesis, characterization and photo-epoxidation performance of Au-loaded photocatalysts

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Abstract

Titanium silicalite-1 (TS-1) was synthesized by hydrothermal crystallization. Au-loaded TS-1 (Au/TS-1) was prepared by the photo-deposition method. The prepared photocatalysts have been fully characterized by Raman, Brunauer–Emmett–Teller (BET), transmission electron microscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and ultraviolet visible light spectroscopy to reveal their structure, surface morphology and chemical composition. Photocatalytic activity of these photocatalysts was ascertained by gas phase photo-epoxidation of propylene-to-propylene oxide in the presence of molecular oxygen only under light irradiation. No sacrificial reductant such as hydrogen was used during the photoreaction. Au/TS-1 photocatalyst remained highly stable under reaction conditions. It is found that the increased Ti3+ sites due to the incorporation of Au will not only enhance the selectivity of the photocatalyst to form epoxide but also its stability during C3H6 conversion.

The photo epoxidation of propylene to propylene oxide was carried out over Au-loaded photocatalysts. Au/TS-1 photocatalyst performed highly stable selective epoxide under reaction conditions. The increased Ti3+ sites due to the incorporation of Au not only enhanced selectivity of epoxidation, but also maintained stability during C3H6 conversion.

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Acknowledgements

This research was financially supported by the National Science Council of Taiwan under contract number NSC 99-2923-E-002-002-MY2. The authors also thank Dr. Janusz Lasek from Institute for Chemical Processing of Coal, Poland for great help in designing the photo-reactor.

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  1. Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan

    VAN-HUY NGUYEN, HSIANG-YU CHAN & JEFFREY C S WU

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  1. VAN-HUY NGUYEN
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  2. HSIANG-YU CHAN
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  3. JEFFREY C S WU
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Correspondence to JEFFREY C S WU.

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NGUYEN, VH., CHAN, HY. & WU, J.C.S. Synthesis, characterization and photo-epoxidation performance of Au-loaded photocatalysts. J Chem Sci 125, 859–867 (2013). https://doi.org/10.1007/s12039-013-0449-z

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  • DOI: https://doi.org/10.1007/s12039-013-0449-z

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