Study On Screening And Preparation Catalyst For Catalytic Oxidation Of Propane And Liquid Paraffin

Consider the Screening and Preparation catalyst for catalytic oxidation of Propane and liquid paraffin to corresponding acrylic acid.Therefore,it is necessary to synthesis Mo VNb TeO and Mo VTe Nb Ni O catalysts for catalytic oxidation of propane to acrylic acid;synthesis V2O5/ZSM-5 as catalyst for selective oxidation of liquid paraffin to fatty acid.The catalytic performance of those catalysts were studied and the properties of those catalysts were studied by SEM?EDX?XRD?XPS?H2-TPR?NH3-TPD?and FT-IR,the research may provide certain reference and guidance for the development of Screening and Preparation catalyst.The specific content as follows:(1)These findings suggested that the obtained catalyst containing Mo VNb Te O(elemental ratio Mo:V:Nb:Te=1:0.3:0.12:0.23)by slurry method possessed of high content of active phase and exhibited a high acrylic acid yield under a calcination temperature of 600? and in an inertia atmosphere.The effects of reaction temperature,gas atmosphere C3H8/O2 ratio and dosage of catalyst on ability of Mo VNb Te O in oxidation of propane to acrylic acid were investigated.The results showed that when the reaction temperature was 400 ?,the dosage of catalyst was 0.4 g,the gas atmosphere C3H8/O2 ratio was 2:3,the acrylic acid was obtained and the performance was optimal,exhibited a 16.1%acrylic acid yield(50.1% conversion and 33.2% selectivity).(2)In the research on modification of Mo VTeNb O,Te element mainly selective effect in the Mo VTeNb O catalytic oxidation of propane to acrylic acid.The Mo1V0.3Te0.23Nb0.12Ni0.008 O catalyst is the more effective and extremely active than others,which exhibited a 17.9% acrylic acid yield(51.9% conversion and 34.5% selectivity).(3)The Mo VNb O only act as catalysis in the process of selective oxidation of liquid paraffin to fatty acid,the main catalysis element was V in Mo VNb O.Hence,Ammonium vanadate as raw material,ZMS-5 as carrier,the V2O5/ZSM-5was prepared by coprecipitation method,and the V2O5/ZSM-5 and oxygen wereused as catalyst for selective oxidation of liquid paraffin to fatty acid.The results show that the optimal conditions for preparing fatty acid are at 150 ?,8 h,0.1 g catalyst and oxygen atmosphere.As a result,the acid number was 17.33 mg(KOH)/g,the saponification number was 33.52 mg(KOH)/g.