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本文从应用意图出发,采用CdS、混Pt/CdS和镀Pt/CdS三种光催化剂,研究(1)反应温度,(2)催化剂表面含Pt量,(3)修饰方法和催化剂表面结构形貌对光催化SO_2水溶液生成H_2SO_4同时放H_2反应的活性和选择性的影响。结果表明:(1)本反应有明显温度效应,利用太阳能中约占50％的红外段辐射来提高反应温度到70℃可使活性增至7倍,但选择性下降,(2)估算了反应活化能为21kJ·mol~(-1),(3)得出60℃为反应较佳温度,(4)表面含Pt量在5％左右活性最高,(5)混Pt/CdS体系形成高分散、细颗粒分布,其催化活性比镀Pt/CdS体系为高。根据实验结果对反应机理进行了一些讨论。
In this paper, three kinds of photocatalysts, CdS, Pt / CdS and Pt / CdS, were used to study (1) the reaction temperature, (2) the amount of Pt on the catalyst surface, (3) the modification method and the surface morphology of the catalyst On the Activity and Selectivity of H_2SO_4 Simultaneous Release of H_2 by Photocatalytic SO_2 Aqueous Solution. The results show that: (1) The reaction has obvious temperature effect. Using 50% infrared radiation in solar energy to increase the reaction temperature to 70 ℃, the activity can be increased to 7 times, but the selectivity decreases. (2) The reaction The activation energy is 21 kJ · mol -1, (3) The reaction temperature is 60 ℃, (4) the Pt content is about 5%, and (5) the Pt / CdS system is highly dispersed , Fine particle distribution, the catalytic activity than Pt / CdS system is high. The reaction mechanism is discussed based on the experimental results.