Nano-sized Vanadyl Pyrophosphate Catalyst for Oxidation of n-butane to Maleic Anhydride

The nano-sized VPO catalyst precursors are prepared in organic phase and added with combinations of Bi and DMSO additives by impregnation.The characteristics of VPO catalysts are investigated through the performance evaluation experiment It can be seen that the nano-sized crystallites of VPO catalysts are pretty good at the selective oxidation of n-butane to maleic anhydride.It is found that the conversion ratio of n-butane and the selectivity to maleic anhydride over the catalysts are 81%and 68%respectively.By using XRD,SEM and IR analysis method,catalysts have more active phases(VO)_2P_2O_7 and a few VOPO_4 phases and the crystallites of VPO catalyst are 30～50 nm.