Abstract：A vanadium phosphate (VPO) catalyst with excellent catalytic performance for the oxidation of n-butane to maleic anhydride was prepared by the organic method. The detailed preparation process of catalyst was investigated by the techniques of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TG). The phase, valence state, structure and BET surface area of catalyst in the preparation process were analyzed. The reaction conditions for the oxidation of n-butane to maleic anhydride were studied in a fixed-bed reactor, and the influences of temperature, concentration of n-butane and space velocity on the catalytic performance of catalyst were investigated. The results indicated that the main phase of the precursor is VOHPO4·0.5H2O. The main active phases of catalyst are (VO)2P2O7 (V4+), VOPO4 (V5+) and V/P mica phase (mixed phase of V4+ and V5+). The obtained catalyst has a lamellar structure and a surface area of 24.08 m2/g. The preparation of the catalyst includes drying, calcination and activation, which are all very important to performance of the catalyst. The best reaction condition is as following: the temperature is 395 ℃, the molar fraction of n-butane is 1.4%~1.5%, and the space velocity is 2 000 h-1. The n-butane conversion and the selectivity to maleic anhydride are 85%~87% and 59%~60%, respectively.
Xu Junfeng,Gu Longqin,Zeng Wei et al. Preparation and Catalytic Performance of Catalyst for the Oxidation of n-Butane to Maleic Anhydride[J]. 化学反应工程与工艺, 2015, 31(3): 233-240.
