The experimental investigation of methane catalytic combustion on coated noble catalyst was carried out,using an integral micoreactor under the condition free of external and internal diffusion limitations.Forty-five groups of experimental data for methane conversion were obtained under different space velocities and temperatures.The partial least-square(PLS)and The Nelder-Mead simplex search methods were employed to estimate the parameters of the intrinsic model.The intrinsic model of lean methane catalytic combustion on the HPA(KMK) catalyst is rA=7.32×109 exp(-64 550RT)CA.The parameters obtained are consistent with the Physical-Chemical rules and statistically reasonable.
The catalytic combustion of low concentration methane was systematically investigated in a pilot scale reverse flow reactor.The influences of cyclic period,the concentration of reactant and the space velocity on the operation performance of reactor were studied.The experimental results showed that,for the reverse flow reactor,cyclic period,the concentration of reactant and the space velocity were three important operation parameters that obviously affected the axial temperature profiles of reactor.It′s possible to maintain autothermal operation with high conversion of methane even though the methane concentration decreased to 0.5%.When the methane concentration was increased up to 0.8%,the highest temperature of catalyst bed was beyond 700 ℃.It suggests that the energy of the hot gas should be recovered and this reactive technology is able to be used in power production with low concentration methane.
