摘要
在室温条件下利用甲醛还原法,制备了Pt粒径可控纳米颗粒并担载于γ-Al2O3载体上的Pt/γ-Al2O3催化剂.利用甲醇重整反应为探针反应,考察了Pt粒径与催化反应性能之间的关系,发现催化反应的性能与担载贵金属粒径之间存在明显的相关性.结合透射电镜(TEM)表征结果与甲醇水蒸气重整(SRM)性能,发现纳米Pt的粒径大小不但影响甲醇重整反应的活性,同时也影响反应的选择性,即催化剂的性质与担载贵金属粒径之间存在明显的尺度效应.
Nano-Pt/γ-Al_2O_3 catalysts deposited with size controlled platinum nanoparticles have been synthesized by reduction of H_2PtCl_6 solution with HCHO at room temperature. The results of activity evaluation for steam reforming of methanol, as a reaction probe, indicated that the activities and selectivities of Pt/Al_2O_3 were dependent on the sizes of Pt nanoparticles. The catalysts were characterized by transmission electron microscopy (TEM). The results of characterization and catalytic reaction confirmed the size dependent properties of Pt nanoparticles for methanol reforming.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2005年第2期98-103,共6页
Journal of Molecular Catalysis(China)
基金
国家重点基础研究发展规划(No.G20000264)973资助项目.
