丙烯在MoO_3和γ-Bi_2MoO_6上选择(氨)氧化副产物形成机理的化学捕获和DRFTIR研究  

Chemical Trapping and DRFTIR Study of Mechanism of by-ProductsFormation in Selective (Amm) Oxidation of Propyleneon MoO3 and γ-Bi2MoO6

作　　者：翁维正[1] 阎季阳 蔡俊修[1] 戴深峻[1] 曹守镜[1] 陈玲玲 万惠霖[1] 

机构地区：[1]厦门大学化学系,361005

出　　处：《高等学校化学学报》1991年第1期106-110,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：采用以H_2、NH_3及CH_3I为捕获剂的化学捕获方法研究了丙烯在MoO_3和γ-Bi_2MoO_6上的吸附.结果表明,丙烯吸附时通过在Mo^(2+)和邻近晶格氧上断裂C=C及C—C键发生碳链碎片化,导致C_1、C_2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-Bi_2MoO_6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.Chemical trapping experiments with H2, NH3, and CH3I as the trapping agents were used for studying the adsorption of propylene over MoO3 or r-B2MoO6. The results show that fragmentation of carbon chain takes place during the adsorption of propylene through breaking C = C double bond and C-C bond on Mo2+ and the adjacent lattice oxygen, leading to formation of the oxygen- or nitrogen-containing by- products of C1 and C2 species. Diffuse- Reflection Fourier Transform Infrared (DRFTIR) spectroscopy was used to study the surface species formed during the chemisorption and reaction of propylene over r-Bi2MoO6 at a lower temperature. The results that C1, C2 species 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.

关 键 词：丙烯 催化剂 选择氧化 氨氧化 MOO3 

分 类 号：O623.121[理学—有机化学]