Abstract
Among some types of catalysts in a reactor, one of the popular configurations is a surface catalyst, in which a catalyst layer is coated on the channel plate. The phenomenon within the channel with the surface catalyst is complicated because of the boundary layers for temperature and concentrations in gas phase. Furthermore, the profiles of concentration within the catalyst layer must be taken into account. In this study, the models of reaction kinetics which includes the internal diffusion within a catalyst are proposed and confirmed through the experiment of steam methane reforming with different thickness of catalyst layer.