考察了超临界条件下合成TiO_2基光催化剂的性质,尤其是在超临界CO_2下得到的分散在TiO_2上Pt的特性,并与商品化TiO_2性能进行了比较.另外,所得催化剂的光催化活性用CO_2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TiO_2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CO_2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. The properties of TiO 2 -based photocatalysts synthesized under supercritical conditions, especially the properties of Pt dispersed on TiO 2 under supercritical CO 2, were investigated and compared with those of commercial TiO 2 .In addition, the photocatalytic activity CO 2 photoreduction solar fuel was evaluated.The results show that the catalyst can be obtained with better than the commercial TiO 2 or similar properties (high specific surface area, crystallinity, surface hydroxyl concentration, large pore volume, enhanced visible light absorption, high Methane production rate) was used in the CO 2 reduction to produce fuel, which is attributable to the catalyst supercritical medium synthesis process.