Results are reported from the experimental investigation and numerical simulation of the laminar boundary layer formed on the flat plate in flowing combustion products of propane in air. During the experiments such parameters as the temperature of the plate surface and the composition of the oncoming flow (due to a change of the fuel to air equivalence ratio phi) have been varied. In addition, when performing numerical simulations, the catalytic properties of the surface have been changed. The comparison of the measured profiles of velocity, temperature, OH and CO concentrations with the results of the calculation based on the chemically reacting boundary layer model has revealed that the model adequately described both distributions of parameters in the boundary layer and their dependence on the boundary conditions and parameters of the free stream flow.