PROCESS FOR THE PREPARATION OF CATALYTIC PRUDUCTS FOR THE OXIDATIVE DEHYDROGENATION OF ALKYLAROMATICS OR PARAFFINS

摘要

Process for preparing catalytic systems consisting of: a vanadium oxide; a bismuth oxide; and a carrier consisting of magnesium oxide, wherein the vanadium, expressed as V2O5, is in a quantity ranging from 2 to 35% by weight, the bismuth, expressed as Bi2O3, ranges from 2 to 40% by weight, the complement to 100 being the carrier, characterized in that it essentially comprises the following steps: preparation of solutions based on derivatives of the components of the catalytic system; mixing of the solutions prepared and optional aging; drying of the solution obtained; first heating, in the presence of air, of the solid obtained from the drying at a temperature ranging from room value to a temperature of between 290 and 310 DEG C, for a time ranging from 1 to 3 hours; optional second heating, in the presence of air, of the solid for a time ranging from 0.5 to 2 hours at a constant temperature, ranging from 290 to 310 DEG C, reached in the first heating; additional heating, in the presence of air, of the solid for a time ranging from 2 to 4 hours at the calcination temperature ranging from 600 to 850 DEG C; calcination, in the presence of air, of the solid at a constant temperature, ranging from 600 to 850 DEG C, reached in the additional heating, for a time ranging from 8 to 16 hours.