V-Ti oxides catalysts were prepared by impregation and calcinated at different temperature and tested in a fixed bed reactor for durene oxidation to pyromellitic dianhydride (PMDA) .The physical-chemical properties of catalysts were characterized by XRD,Raman and H2-TPR method.The results showed that the vanadium in the catalyst was mainly in the form of crystal V2O5 and surface VOx species on the TiO2.The ratio of surface VOx species and crystal V2O5 in catalyst can be influenced by calcination temperature,and the higher temperature,the more V2O5 and polymerized VOx species it was in the cata-lyst.The catalyst calcinated at 500 ℃ has a highest PMDA yield of 85.8％ in the reaction of durene oxidation as the reducibility was moderate and the weak acidity was more.
关键词
催化剂工程/钒钛氧化物催化剂/均苯四甲酸二酐/气相氧化/焙烧温度
Key words
catalyst engineering/V-Ti oxide catalysts/pyromellitic dianhydride/gas oxidation/calcination temperature
维普
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