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研究论文

PHOTOCATALYTIC OXIDATION OF PHENOL ON TiO₂ PRATICLE 1.PRODUCTS DISTRIBUTIO ON AND PEACTION PATHWAY

摘要：选择TiO₂粉末催化剂,考察了在中压汞灯作用下,苯酚光催化氧化途径及产物分布。对反应过程中的羟基物、羧酸及二氧化碳3个反应阶段的产物进行了详细的全组份分析。对其中8种主要产物追踪其浓度的变化。尤其对目前人们尚未确定的中间极性物,进行了很好的分离测定。实验中最终CO₂的生成量达63.0%,此时碳的物料平衡达94.4%.邻苯二酚、反丁烯二酸或甲酸、二氧化碳可分别作为3个阶段的代表产物,用以判断氧化反应的进程。考察了气相氧浓度变化时,产物分布规律。深入的产物分析为揭示

Abstract：The photocatalytic oxidation of phenol in TiO₂ particle suspensions has been studied in atest reactor illuminated with a 5000 W medium pressure mercury lamp.Eight main productshave been identified by HPLC, IC, TOC and GC /MS.The results indicated that there arethree stages of reaction from the viewpoint of products distribution, there are hydroxyla-tion, carboxylation and mineralization, The oxidation process could be explained nd justifiedby means of coricentration variation of main products like pyrocatechol, fumaric acid andCO₂ and the carbon mass balance achieved 94.4%, The effects of CO₂ concentration in gas phase on the phenol decomposition and products distribution have been investigation.