Total pressure variation determination of reaction rates at constant reactant pressure Catalytic decomposition of ammonia by tungsten

Confirmation of a mechanism for the catalytic decomposition of ammonia by tungsten deduced from thermal desorption results requires measurements of the overall rate of reaction over a wide range of reactant pressures. Total pressure variation measurement of the rate is complicated by slow desorption of the reactant from the reaction vessel wall. A manostat is described which eliminates these problems. The rate of reaction has been determined …