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Résumé :
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Au/TS-1 catalysts could be prepared by immobilizing the biosynthesized Au sol on TS-1 supports. A variety of techniques, such as N2 physisorption, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectorscopy, UV-visible diffuse reflectance, and thermogravimetric analysis, were employed to characterize both the supports and the bioreduction catalysts. The influence of various parameters (Si/Ti molar ratio, Au loading, immobilization pH, reaction temperature, and space velocity) on the catalytic performance in vapor phase propylene epoxidation with H2/O2 was systematically analyzed. parameter optimization results manifested that the optimum catalytic activity and stability of bioreduction Au/TS-1 catalysts were obtained of 573 optimum operation conditions of Si/Ti molar ratio Furthermore, of were also made to pH of 2, reaction temperature of 573 K, and space velocity of 4000-8000 mL gcat-1 h-1. Furthermore, efforts were also made to clarify the plausible reaction routes over the bioreduction catalysts.
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