Modeling of methane autothermal reforming in a cylindrical Pt-Ni washcoated reactor

Abstract

The catalytic indirect partial oxidation (combined total oxidation and steam reforming) reactor for the conversion of methane to hydrogen for fuel cell applications is investigated using computer–based modeling techniques by applying mass and energy balances at steady state. In the model, cylindrical Al2O3 wash-coat type catalytic reactor operating adiabatically is used. The inner wall of the Al2O3 cylinder is modeled as a Pt-Ni bimetallic surface; in the simulations total oxidation is catalyzed by Pt sites and steam reforming is catalyzed by Ni sites. The heat transfer from Pt sites, where exothermic TOX is catalyzed, to Ni sites, where endothermic SR is catalyzed, is considered in the model. Computer simulations are carried out for a set of different feed ratios, inlet temperatures and Pt:Ni surface molar ratios of the catalyst. Reactor temperature, hydrogen production yield and methane consumption are analyzed. Results indicate that the reactor efficiency is higher when Pt:Ni surface ratio is 1:5, steam to methane ratio is increased and methane to oxygen ratio is decreased..