| Summary: | 碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 95 === Supported gold catalyst has been a subject of intense investigation. In spite of these efforts, there is still great uncertainty of the cause of the high activity and there is a wide variation in the activities reported among different laboratories. Superficially, all results suggest that the catalytic activity depends on the support. The aim of this study was to develop a method to prepare CeO2-TiO2 and MnO2-Fe2O3 to be used as supports by incipient-wetness ingeneration method. We change the molar ratio Ce/Ti and Mn/Fe to obtain different CeO2-TiO2 and MnO2-Fe2O3 supports. The molar Ce/Ti and Mn/Fe ratio was 1/1, 2/8, 3/7, 4/6, and 5/5. Used to HAuCl4 as the Au precursor to prepare Au/CeO2-TiO2 and Au/MnO2-Fe2O3 catalysts by deposition-precipitation. The gold catalysts Au/CeO2-TiO2 and Au/MnO2-Fe2O3 were maintained pH value 7 and 9. Au/CeO2-TiO2 and Au/MnO2-Fe2O3 were dried at 80℃ and 110 ℃ for overnight dividedly. The calcination temperature was at 180℃ for 4 h. The activity and selectivity of PROX was measured using a Pyrex fixed-bed continuous flow reactor at various temperatures (25
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