高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (4): 592.

• 论文 • 上一篇    下一篇

添加Ag或Ag、Ni的V2O5表面氧性质及催化性能研究

张惠良, 上官荣昌, 葛欣, 张琦   

  1. 南京大学化学系, 南京, 210008
  • 收稿日期:1993-06-14 修回日期:1993-11-16 出版日期:1994-04-24 发布日期:1994-04-24
  • 通讯作者: 张惠良,男,61岁,教授.
  • 作者简介:张惠良,男,61岁,教授.
  • 基金资助:

    中国科学院科研基金;南京大学现代分析中心测试基金

Studies of the Nature of the Surface Oxygen Species and the Catalytic Activities of V2O5 and V2O5 with the Additive Ag or Ag,Ni

ZHANG Hui-Liang, SHANG-GUAN Rong-Chang, GE Xin, ZHANG Qi   

  1. Department of Chemistry, Nanjing Univcrsity, Nanjing, 210008
  • Received:1993-06-14 Revised:1993-11-16 Online:1994-04-24 Published:1994-04-24

摘要: 用TPD-MS及甲苯选择氧化活性测定等方法研究了V2O5和添加Ag或Ag、Ni的3种样品的表面氧和晶格氧的热脱附性能及催化活性,结果表明,在V2O5中加入Ag或Ag、Ni后,样品表面上的O-和O2-氧物种的脱附活化能明显降低。添加Ag、Ni样品表面氧的脱附活化能最低,而苯甲醛生成的选择性最高。在V2O5和含有Ag、Ni的样品中,温度为968和734℃时,均依次出现以晶格氧(O2-)脱附为主的脱氧峰,其脱附活化能也以添加Ag、Ni的样品最低。

关键词: V2O5, 添加Ag(或Ag、Ni), 表面氧物种, 甲苯选择氧化

Abstract: The TPD-MS technique and the measurement of catalytic activity for toluene selective oxidation were used to study the thermal desorption properties of surface and lattice oxygen of V2O5 and V2O5 with additive Ag or Ag, Ni.The results showed that on the surfaces of the three samples the surface O- and O2- species were detected.With Ag or Ag, Ni added, the activation energy values(Ed)of the desorption of surface oxygen species(O- and O2-)decreased explicitly, and this shows that the Ed value of the sample containing Ag, Ni was the lowest, while the selectivity of benzaldehyde was the highest.In addition, for the samples of V2O5 and V2O5 with the additive Ag, Ni, a desorption peak which was mainly the lattice oxygen(O2-)appeared at 968 and 734℃, respectively, and the Ed value for the sample containing Ag and Ni was also the lowest.

Key words: V2O5, Additive Ag(or Ag and Ni), Surface oxygen species, Selective oxidation of methylbenzene

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