INFLUENCE OF REACTING ATMOSPHERE ON ISOTHERMAL DECOMPOSITION OF AMMONIUM METAVANADATE

Ammonium metavanadate (AMV) was decomposed under pure oxygen, air, nit rogen, vacuum and controlled humidity, in the temperature range of 453 to 623 K. Three well established limiting conversions appear correspo nding to the formation of ammonium tetravanadate at 453 K (50%), ammon ium hexavanadate at 503 K (67%), and V2O5 at 623 K (100%). Oxidizing a tmospheres have a retarding effect at 453 K but an accelerating one at 573 to 623 K, as observed from the reaction limiting time and rate co nstant. In addition to H2O and N2, oxygen plays an important role in t he oxidation of ammonia to N2, and in the proton transfer process.