اكسيداسيون نرمال بوتان بر ايندريد مالييك روي كاتاليزور VPO در راكتور بستر ثابت

Selective oxidation of n- butane to maleic anhydride over a vanadium phosphorus oxide (vpo) catalyst in a fixed bed reactor

In this research, oxidation of n-butane to maleic anhydride (MA) over vanadium-phosphorus oxide(VPO)catalyst ,prepared in an organic medium, was investigated in a fixed bed reactor.A comparative study has been conducted between promoted(promoted with molybdenum) and unpromoted VPO catalysts. It was abserved that the molybdenum increases the selectivity toward MA .The most important phase of VPO catalyst for oxidation of n-butane to maleic anhydride is Vanadyl Pyrophosphate (VO)2P2 07 that obtain from Phosphohemihydrate VOHPOf. 0.5 HʹcO .Experiments show that a catalyst having P/V atomic ratio equal to 1.1,Mo/v weight ratio of 0.08,gives the maximum selectivity of 98%at a temperature of 425- 450 °C and retention times 1.28 (GHSV=2800 hr-1 ) and an inlet n-butane concentration of 1%of nC41Air . A kinetic model for the oxidation of n-butene to maleic anhydride on VPO catalyst was derived, which is in a reasonable agreement with experimental data.