通过担体改性制备高分散态的Pt/C催化剂  

Preparation of Highly Dispersed Pt/C Catalyst by Impregnating Modified Carbon Supports

作　　者：钟正坤[1] 孙颖[1] 陈银亮[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《原子能科学技术》2009年第11期982-986,共5页Atomic Energy Science and Technology

基　　金：中国工程物理研究院科学技术基金资助项目(20030867)

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。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.

关 键 词：PT/C催化剂 活性炭担体 表面改性 

分 类 号：TL278[核科学技术—核燃料循环与材料] TQ131.11[化学工程—无机化工]