In order to develop a NOx-free catalytic combustor, a catalytic combustion using a platinum group catalyst supported on a honeycomb substrate has been examined. Measurements were made with kerosene/air mixture of 1-10 excess air ratio, 100-200mg/s of kerosene consumption rate. The measured quantities were substrate temperature, NOx, CO, CO2 concentration in the exhaust gas. The results obtained are as follows:
1. The catalytic combustor operated on a transitional region between a flame region and a entirely heterogeneous reaction region, forms a reaction zone in the gas phase of the channel without a visible flame.
2. The entirely heterogeneous reaction region and the transitional region, are practically available on the viewpoint of thermal durability of the catalyst and NOx formation.
3. Increasing of the catalyst thickness makes it possible to complete the catalytic combustion, because of decrease in the SV value and increase in the catalytic temperature. The effect of SV value appears mainly when the combustor is operated on the entirely heterogeneous reaction region, but the effect of the temperature mainly appears on the transitional region.
