Adsorption of Carbonyl Sulfide on Propylamine Tethered to Porous Silica

Abstract

Carbonyl sulfide (COS) reacts slowly with amines in the aqueous solutions used to absorb CO from natural gas and flue gas and can also deactivate certain aqueous amines. The effects of COS on amines tethered to porous silica, however, have not been investigated before. Hence, the adsorption of COS on aminopropyl groups tethered to porous silica was studied using in situ IR spectroscopy. COS chemisorbed mainly and reversibly as propylammonium propylthiocarbamate ion pairs [R-NH(C═O)SHN-R] under dry conditions. In addition, a small amount of another chemisorbed species formed slowly and irreversibly. Nevertheless, the CO capacities of the adsorbents were fully retained after COS was desorbed.

Structure Design of Low-Temperature Regenerative Hyperbranched Polyamine Adsorbent for CO2 Capture

“…Among various CO 2 capture methods, CO 2 capture using liquid amine has been used industrially for several decades . However, the conventional liquid amine scrubbing processes involve intrinsic limitations due to corrosion problems, volatile amine loss, and high energy consumption for regeneration. , To overcome these limitations, solid amine adsorbents have emerged as a promising alternative with the advantages of their lower energy penalty and noncorrosive properties for regeneration. − Extensive research efforts have focused on the development of grafted − and impregnated − amine-containing species on large surface area supports and fibers, such as amine-functionalized porous materials, − silicas, − carbons, metal organic frameworks, , and amines grafted on fibers, − including polypropylene fiber, glass fiber, viscose fiber, , and cellulose fiber, for CO 2 capture. Among these adsorbents, the adsorption capacities range from 1.0 to 5.0 mmol/g, indicating that the solid amine adsorbents could effectively uptake CO 2 from flue gas.…”