Investigation of the Heterogeneous Decomposition of Ammonia in an Inverted, Stagnation-point Flow Reactor

The heterogeneous decomposition of ammonia on a quartz surface in an inverted, stagnation-point flow reactor was investigated using a measurement reactor and a numerical model of the reactor. In the experiments, 8 mole% of ammonia in nitrogen was used and the temperature of an electric heater was set in the range 300 similar to 900 degrees C to heat the quartz surface where the decomposition took place. Gas temperatures and ammonia concentrations in the reactor obtained using in situ Raman spectroscopy were analyzed with the numerical model and it was revealed that, depending on the heater temperature, the temperature of the quartz surface was estimated to be in the range 235 similar to 619 degrees C and the activation energy of the decomposition on the surface was in the range 10.9 similar to 15.8 kcal/mol.