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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (9): 802-808. 上一篇    下一篇

研究论文

甲醇重整反应中Pt/γ-Al2O3催化剂纳米Pt粒径与催化性能关系研究

毕迎普1 2，吕功煊*1，耿东生1，毕玉水1   

  1. (1中国科学院兰州化学物理研究所 羰基合成与选择氧化国家重点实验室 兰州730000)
    (2中国科学院研究生院 北京100039)
  • 投稿日期:2004-07-01 修回日期:2005-01-01 发布日期:2010-12-10
  • 通讯作者: 吕功煊

Correlation of Activity and Size of Pt Nanoparticles for Methanol Steam Reforming over Pt/γ-Al2O3 Catalysts

BI Ying-Pu1,2, LÜ Gong-Xuan*1, GENG Dong-Sheng1, BI Yu-Shui1   

  1. (1 State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000)
    (2 Graduate School of the Chinese Academy of Sciences, Beijing 100039)
  • Received:2004-07-01 Revised:2005-01-01 Published:2010-12-10
  • Contact: LÜ Gong-Xuan

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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.

关键词: pH值, 硝基甲烷, Pt/γ-Al2O3, 粒径, 甲醇重整

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.

Key words: pH, nitromethane, Pt/γ-Al2O3, nanoparticle size, steam reforming of methanol