Prohibitive effect of supercritical CO2 on liquid-phase oxidation of p-xylene over Co/Mn/Br catalyst

摘要：

The effect of adding supercritical CO2 into the p-xylene liquid-phase catalytic oxidation process has been investigated, which uses molecular oxygen as an oxidant and acetic acid as solvent. The results showed the oxidation of p-xylene to p-Toluic was severely inhibited when supercritical CO2 exceeded a certain amount, the conversion of p-xylene drops rapidly from 100% to 3.3%, meanwhile, the yield of terephthalic acid drops from 42.6% to trace. That means that supercritical CO2 works as an inhibitor rather than a promoter. Further investigation found that supercritical CO2 inhibits the step of hydrogen abstraction from methyl group, which may be due to that supercritical CO2 reduces the contact between catalyst and substrates.

关键词： catalytic oxidation p-xylene inhibitive effect supercritical CO2

作者: Kan Huang Jie Chen WeiZhen Sun Ling Zhao

作者单位: State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 200237 Shanghai, China

会议类型: 国际会议

会议名称: The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)

会议地点: 大连

会议语种:英文

在线出版日期: 2008-08-04（万方平台首次上网日期，不代表论文的发表时间）