THE KINETICS OF SYNTHESIS OF ACRYLONITRILE VIA PROPANE AMMOXIDATION ON V-Sb-O CATALYST

摘要

The kinetic behavior of acrylonitrile(ACN) synthesis via propane ammoxidation and the effect of feed ratio(NH_3/C_3H_8, O_2/C_3H_8, H_2O(g)/ C_3H_8) were investigated on V-Sb-O(W,P,Sn) mixed oxides. The best ratio were found to be 1.8-2.4,2.2-3.0,>3.0 Experimental results showed that ACN forms from two parallel ways: 1. directly from propane, and prevalently through the intermediate formation of propylene. The limiting factor in the formation of ACN is the relative slowness of the step of allylic oxidation to ACN of the intermediate propylene, and the higher rate of propylene oxidation to carbon oxides as compared to that of ACN to COx.