乙烷部分氧化超细Fe－Mo－O催化剂的研究

Fe－Mo－O catalysts were prepared by the Sol-Gel method. The surface composition, reducibility, ethane chemisorption and reactivity of the catalysts were systematically studied by using the techniques of XRD, IR, TPR, TPD and micro-reactor. The results showed that the catalyst calcined at 450 ℃ was ultrafine particles with BET surface area of 48.1 m2/g. There existed both Lewis acid sites(Fe3+,Mo6+) and Lewis base sites(oxygen of Mo=O and Mo-O-Fe bond) on the surface of the catalysts. Ethane can be chemisorbed on surface terminal oxygen of Lewis base sites Mo=O bonds by one H atom in -CH3 to form molecular adsorption states, and the adsorption ability increases with the rising of the temperature. Moreover, the ultrafine particles have higher lattice oxygen activity, and the adsorption amount and intensity of ethane on the ultrafine particles is greater than that on the bigger particles. Reaction products of partial oxidation of C2H6 on the Fe－Mo－O catalyst are mainly C2H4 and a little CH3CHO.