热处理对Pt/C和PtRu/C催化剂活性的影响

摘要

The commercial Pt/C and PtRu/C catalysts were heat-treated under vacuum . We investigated the effects of catalysts on methanol oxidation and micro-structure changes. The results showed that the crystal structure of metal components and the number of carbon atoms at the active location of catalyst surface (Pt-C binding site) of Pt/C and PtRu/C catalysts heat-treated at low-temperature (210 ℃) in vacuum have not changed obviously by XRD and TG measurement. Electrochemical test results showed that the heat-treated Pt/C and PtRu/C catalysts have higher activity than the original catalysts. Moreover, Pt/C and PtRu/C catalysts heat-heated at 180 ℃) have the best catalytic activity of methanol catalytic oxidation, but the electrochemical stability of the two catalysts both before and after heated-treatment remains relatively constant.%对商业Pt/C和PtRu/C催化剂进行真空加热处理,研究热处理对催化剂微观结构变化及甲醇氧化的影响.X射线衍射光谱法(XRO)和热重(TG)研究结果表明:低温(210℃以下)真空加热处理对Pt/C和PtRu/C催化剂活性金属组分的晶体结构和催化剂表面处于活性位置(Pt-C结合位置)的碳原子数没有较大影响.电化学测试结果表明:热处理后的商业Pt/C和PtRu/C催化剂对甲醇氧化活性均高于初始催化剂,而且180℃加热处理的Pt/C和PtRu/C催化剂对甲醇催化氧化性能最好,其电化学稳定性在热处理前后基本保持不变.