METHANE STEAM REFORMING IN ASYMMETRIC PD-AG AND PD-AG POROUS SS MEMBRANE REACTORS/

This work is devoted to applying electrolessly deposited Pd- and Pd-Ag /porous stainless steel composite membranes in methane steam reforming . The methane conversion is significantly enhanced by the partial remo val of hydrogen from the reaction location as a result of diffusion th rough the Pd-based membranes. For example, at a total pressure of 136 kPa, a temperature of 500-degrees-C, a molar steam-to-methane ratio of 3, and in the presence of a commercial Ni/Al2O3 catalyst together wit h continuous pumping on the permeation side, a methane conversion twic e as high as that in a non-membrane reactor was reached by using a Pd/ SS membrane. These effects were examined under a variety of experiment al conditions. A computer model of the membrane reactor was also devel oped to predict the effects of membrane separation on methane conversi on.