| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 101 === Global warming has become a major environmental issue to be considered in the 21th century. One possible solution of global warming is the reduction of carbon dioxide. The reduction of carbon dioxide could not only solve the crisis of global warming, but provide a high economic value. Carbon dioxide could be reduced to useful chemicals such as methane, methanol, and other hydrocarbons.
In this research, co-catalyst loaded GaN:ZnO is found to have the ability to perform both photocatalytic reduction of carbon dioxide and produce hydrogen (water splitting) simultaneously. Having the duel functions ability gives the advantages of increasing the conversion of solar energy. An interesting phenomena found while performing photocatalytic reaction of duel function catalyst is that providing the ability of water splitting, carbon dioxide reduction ability is enhanced through the hydrogenation of CO2 [1] through the produced hydrogen. For the reaction in the hydrogenation of carbon dioxide to produce hydrocarbons, the change of Gibbs energy becomes a negative value meaning that the reaction is favorable and is spontaneous. Furthermore, the as produced methanol acted as an electron trap for the enhancement of hydrogen production [2]. Therefore the efficiency of the photocatalyst introduced in this research is higher than recent developed visible light catalyst. The result of Ni/NiO-GaN:ZnO showed a yield of 3.16, 1.12, 2.24, 0.312 μmol/h/g of hydrogen, methane, methanol, formaldehyde respectively.
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