Hydrogen permeation through a Pd-based membrane and RWGS conversion in H_2/CO_2, H_2/N_2/CO_2 and H_2/H_2O/CO_2 mixtures

摘要

This study investigated the effect of gases such as CO_2, N_2, H_2O on hydrogen permeation through a Pd-based membrane -0.012 m~2 - in a bench-scale reactor. Different mixtures were chosen of H_2/CO_2, H_2/N_2/CO_2 and H_2/H_2O/CO_2 at temperatures of 593-723 K and a hydrogen partial pressure of 150 kPa. Operating conditions were determined to minimize H_2 loss due to the reverse water gas shift (RWGS) reaction. It was found that the feed flow rate had an important effect on hydrogen recovery (HR). Furthermore, an identification of the inhibition factors to permeability was determined. Additionally, under the selected conditions, the maximum hydrogen permeation was determined in pure H_2 and the H_2/CO_2 mixtures. The best operating conditions to separate hydrogen from the mixtures were identified.