The compositions and the temperatures within diffusive catalytic combustion burners burning methane, propane, hydrogen and natural gas were measured. As a result, the follow-ing conclusions were obtained.
1) The combustion features showed a fast reaction of fuel with oxygen, similar to those of diffusion flame.
2) The reason such fast reaction occurred depends on the fact that transfer to a reaction controlled by pore diffusion is suppressed by use of a very small diameter fiber catalyst.
3) The prestage reaction of both methane and propane is probably fast partial oxidation which pro-duces CO and H, 2.
4) It was found that the combustion efficiency is decreased at a higher input or at the center, upper part of the module burner due to lack of sufficient oxygen, but forced air combustion facilitated good combustion performance.
