Regenerable potassium-based alumina sorbents prepared by CO2 thermal treatment for post-combustion carbon dioxide capture

CO2 Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

“…In their hydroxylated forms, they are important for direct air capture (in aqueous solution) − or in specialized applications such as scrubbing CO 2 within a spacecraft (Li­(OH) 2 ). , Further, KOH is one of the most commonly used activating agents for carbon-based sorbents. , Monometallic Li-, Na-, and K-carbonates do not decompose completely in CO 2 -rich environments at practically feasible temperatures (up to ∼1200 °C) and can thus not be employed as sorbents in a cyclic reaction scheme with CO 2 being the only gaseous reactant . However, CO 2 capture of these carbonates is feasible in the presence of steam, − and there have been promising experimental investigations where Na 2 CO 3 or K 2 CO 3 was reacted with equimolar amounts of CO 2 and H 2 O to form NaHCO 3 or KHCO 3 at temperatures <100 °C, − including pilot plant campaigns. − Li is typically investigated in ternary metal oxide systems, e.g., Li 2 ZrO 3 or Li 4 SiO 4 , as is discussed in section .…”

Perspective on Sorption Enhanced Bifunctional Catalysts to Produce Hydrocarbons

“…Many researchers have attempted to resolve the slow kinetics by dispersing the active alkali metal carbonate on porous materials such as activated carbon, , TiO 2 , , MgO, , and Al 2 O 3 , ,− leading to an enhanced sorption rate and mechanical strength required for usage in a fluidized bed or transport reactor. Lee et al reviewed the CO 2 capture capacity and regeneration properties of K 2 CO 3 -based sorbents using different support materials (activated carbon, TiO 2 , ZrO 2 , Al 2 O 3 , MgO, and CaO) .…”