Removal of CO₂ and H₂S from Various Gas Streams by a Two-stage Process with Nanoporous-material-supported Polymer Sorbents

A novel NMSPS has been developed for removing CO₂, H ₂S and COS. On the basis of its exceptional function, an innovative two-stage process for removing CO₂ and H₂S, respectively, from gas streams was proposed and conducted in a bench-scale apparatus. As combining the advantages of the high surface area of the nanoporous material and the high absorption capacity and selectivity of the H₂S/CO ₂-philic polymer in NMSPS, the developed sorbent and process exhibit some potential advantages: 1) able to remove H₂S and COS in the gas to at least less than 60 ppbv, 2) higher sorption capacity and selectivity for CO₂, H₂S and COS, 3) higher sorption-desorption rate, 4) working at mild conditions and easier for regeneration, and 5) able to remove and recover CO₂ and H₂S, respectively. All these advantages make the sorbents and the process not only beneficial to the large-scale removal of CO₂, H₂S and COS from gas streams in industry, but also suitable to on-board or on-site removal of CO₂, H₂S and COS from the reformate or biogas for hydrogen production and other applications. It may allow the removal of CO₂, H₂S and COS to be conducted more energy efficiently, economically and environmentally friendly.