高等学校化学学报

高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (1): 106.

• 论文 • 上一篇    下一篇

丙烯在MoO3和γ-Bi2MoO6上选择(氨)氧化副产物形成机理的化学捕获和DRFTIR研究

翁维正, 阎季阳, 蔡俊修, 戴深峻, 曹守镜, 陈玲玲, 万惠霖   

  1. 厦门大学化学系, 361005
  • 收稿日期:1990-10-04 出版日期:1991-01-24 发布日期:1991-01-24
  • 通讯作者: 万惠霖
  • 基金资助:

    国家自然科学基金

Chemical Trapping and DRFTIR Study of Mechanism of by-ProductsFormation in Selective (Amm) Oxidation of Propyleneon MoO3and γ-Bi2MoO6

Weng Wei-zheng, Yan Ji-yang, Cai Jun-xiu, Dai Shen-jun, Cao Shiu-jing, Chen Ling-ling, Wan Hui-lin   

  1. Department of Chemistry, Xiamen University, Xiamen, 361005
  • Received:1990-10-04 Online:1991-01-24 Published:1991-01-24

PDF (PC)

摘要： 采用以H2、NH3及CH3I为捕获剂的化学捕获方法研究了丙烯在MoO3和γ-Bi2MoO6上的吸附.结果表明,丙烯吸附时通过在Mo2+和邻近晶格氧上断裂C=C及C-C键发生碳链碎片化,导致C1、C2的含氧或含氮副产物的形成.以DRFTIR光谱研究了较低温度下丙烯在γ-Bi2MoO6上吸附和反应时形成的表面物种,175℃的实验结果与化学捕获实验一致.而50℃的实验结果与Grasselli等提出的丙烯选择氧化机理吻合.

关键词: 丙烯选择氧化, 氨氧化, 副产物形成机理, 化学捕获, 漫反射付立叶变换红外光谱

Abstract: Chemical trapping experiments with H2, NH3, and CH3I as the trapping agents were used for studying the adsorption of propylene over MoO3or r-Bi2MoO6The results show that fragmentation of carbon chain takes place during the adsorption of propylene through breaking C=C double bond and C-Cbond on Mo2+and the adjacent lattice oxygen, leading to formation of the oxygen-or nitrogen-containing by-products of C1and C2species. Diffuse-Reflection Fourier Transform Infrared (DRFTIR) spectroscopy was used to study the surface species formed during the chemisorption and reaction of propylene over r-Bi2MoO6at a lower temperature. The results that C1, C2species were detected by DRFTIR at 175℃ are consistent with the results of chemical trapping experiments, while the results at 50℃ support the mechanism of selective propylene oxidation proposed by Grasselli et al.

Key words: Selective oxidation of propylene, Ammoxidation, Mechanism of by-products formation, Chemical trapping, DRFTIR

TrendMD: