Most catalytic combustors used in manufacturing catalytic stoves today are made of a high temperature, honeycomb patterned ceramic substrate.
They are coated with special noble metals like palladium and/or platinum.
The honeycomb pattern gives the combustor surface area for the catalytic coatings.
I would like to point out that cell density (16 or 25 cpsi) plus the combustor dimensions are both very important to both the stove’s operation and efficiency.
1. Open frontal area of the combustor is designed to receive the flow rate of the gases coming from the firebox.
2. The combustor’s size and cell density will control the residence time needed for the gases to burn within the combustor.
Always replace the stove’s combustor, when needed, with the original OEM combustor size and cell density for best efficiency and performance of the stove.