考察了超临界条件下合成TiO2基光催化剂的性质,尤其是在超临界CO2下得到的分散在TiO2上Pt的特性,并与商品化TiO2性能进行了比较.另外,所得催化剂的光催化活性用CO2光还原制太阳能燃料进行了评价.结果表明,该催化剂可得到具有比商用TiO2更好或类似的性能(高比表面积、结晶度、表面羟基浓度,大的孔容、增强的可见光吸收、高的甲烷生成速率)而用于CO2还原制备燃料的反应中.这可归因于该催化剂超临界介质合成过程.
This paper investigates the properties of TiO2-based photocatalysts synthesised under supercritical conditions.Specifically,the characteristics of Pt dispersed on TiO2 catalysts obtained in supercritical CO2 are discussed and compared with those of commercial TiO2.The photocatalytic activity of the synthesised catalysts in the CO2 photoreduction reaction to produce solar fuel is tested.The main conclusion of the study is that photocatalysts with better or similar features,including high surface area,crystallisation degree,hydroxyl surface concentration,pore volume,absorbance in the visib le range and methane production rate,to those of commercial TiO2 may be produced for the reduction of CO2 to fuel by synthesis in supercritical media.
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