利用硝基甲烷还原法在室温条件下得到了纳米Pt粒径可控的担载Pt/γ-Al₂O₃催化剂, 并利用甲醇重整反应为反应探针考察了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颗粒粒径之间存在明显的相关性. 通过透射电镜(TEM)、X射线衍射(XRD)、程序升温还原(TPR)等测试手段对催化剂进行表征, 发现钠米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, 即催化剂的催化性能与担载贵金属粒径之间存在明显的尺度效应.

γ-Al₂O₃ supported size controlled platinum nanoparticle catalysts synthesized by reduction of H₂PtCl₆ solution with nitromethane at room temperature have been investigated for steam reforming of methanol as a reaction probe. Experimental results indicated that the activities and selectivities of the Pt/γ-Al₂O₃ catalysts are dependent on size of Pt nanoparticles. The catalysts were characterized by transmission electron microscopy, X-ray diffraction and temperature programmed reduction. The results of characterization and catalytic reaction confirmed the size dependence of Pt nanoparticles for methanol reforming.