物理化学学报 >> 1986, Vol. 2 >> Issue (05): 424-431.doi: 10.3866/PKU.WHXB19860506

研究论文 上一篇    下一篇

担体酸性对铂催化剂的表面性质和催化性能的电子调变效应

王录平; 杨锡尧; 庞礼   

  1. 北京大学化学系催化教研室
  • 收稿日期:1985-09-23 修回日期:1986-01-09 发布日期:1986-10-15

THE ELECTRONIC MODIFICATION EFFECT OF ACIDITY OF SUPPORT UPON THE SURFACE PROPERTIES AND CATALYTIC BEHAVIORS OF SUPPORTED Pt CATALYSTS

Wang Luping; Yang Xiyao; Pang Li   

  1. 北京大学化学系催化教研室
  • Received:1985-09-23 Revised:1986-01-09 Published:1986-10-15

摘要:

采用红外光谱法、竞争加氢反应法和程序升温脱附法等研究三种具有不同酸性的载体—γ-Al_2O_3, Al_2O_3-SiO_2和HY分子筛与铂的相互作用, 结果表明载体的酸性部位对铂原子具有吸电子作用, 使铂原子表现为缺电子状态; 酸性部位的酸强度越大吸电子的能力越强。酸性部位的这种电子效应使铂催化剂的甲苯加氢活性和抗硫中毒性能都增强。

Abstract:

The electronic effect of acidity of supports upon the surface properties and catalytic behaviors of various supported Pt catalysts have been studied by IR spectroscopy, competitive hydrogenation reaction, TPD method and hydrogenation of toluene as test reaction. The supports used are HY zeolite, Al_2O_3-SiO_2, γ-Al_2O_3 etc. Number of acid site and acid strength of supports determined by n-butylamine titration method follow the sequence: for number of acid site: HY>Al_2O_3-SiO_2>γ-Al_2O_3 for acid strength:
for number of acid site: HY>Al_2O_3-SiO_2>γ-Al_2O_3
for acid strength: HY>Al_2O_3-SiO_2>γ-Al_2O_3
...