【摘要】 通过在5%O2+N2流中加热气化和浓HNO3表面氧化处理,获得表面改性活性炭担体,采用H2PtCl6水溶液浸渍法制备Pt/C催化剂。实验结果表明:铂在未经改性的担体表面的粒径分布不均匀,且易发生再团聚而形成较多的大颗粒铂粒子;改性担体上的铂呈均匀分布的高分散状态,其平均粒径为7 nm。更多还原

【Abstract】 Carbon supports were modified by different treatments,including gasification under a gas flow of 5%O2+N2 in the range of 385-425 ℃ and oxidation with concentrated HNO3 under controlled conditions,in order to obtain materials with different surface properties.The modified carbon supports were directly impregnated with the aqueous chloroplatinic acid to generate Pt/C catalysts.Analytic results by XRD and TEM demonstrate that the dispersion of platinum crystallites on the modified carbon supports is very high with a mean diameter of 7 nm,while the segregation of platinum crystallites occurs obviously for unmodified carbon supports.更多还原