where 𝑟 𝑗 and 𝜈 𝑗 is the rate and the net reaction coefficient of NH3 for reaction 𝑗 and 𝑉 𝑡 is the volume of the reactor at time 𝑡. Equation ( ) gives a relation between the reaction rates and the decomposition rates and makes it possible to identify which reactions contribute the most to the decomposition.