Ca2CuO3: A high temperature CO2 sorbent with rapid regeneration kinetics. Issue 2 (April 2022)

• Record Type: Journal Article
• Authors: Hassani, Ehsan; Cho, Jinwon; Feyzbar-Khalkhali-Nejad, Farshad; Rashti, Ali; Jang, Seung Soon; Oh, Tae-Sik
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 2(2022)
• Publication Date: 2022-04
• Subjects: CO2 capture -- CaO-based sorbent -- Inversion temperature -- Temperature programmed carbonation -- Temperature swing; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.107334
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Three different calcium-based ternary oxide sorbents, Ca2 CuO3, Ca3 Co4 O9, and Ca2 Fe2 O5, were characterized as potential sorbents for CO2 capture. The behaviors of these sorbents were compared to CaO under various CO2 concentrations via temperature programmed carbonation/decarbonation. Ca2 CuO3 and Ca3 Co4 O9 showed lower inversion temperatures, while Ca2 Fe2 O5 had a higher inversion temperature than CaO. In addition, the copper and cobalt containing sorbents showed relatively narrower temperature windows going from the highest carbonation rate to the highest decarbonation rate. This narrow temperature window can be advantageous in operating a temperature swing process. Ca3 Co4 O9 and Ca2 Fe2 O5 showed low conversion. Under the best-case scenario, the conversion of these sorbents was less than 25%. Ca2 CuO3 showed faster regeneration compared to CaO when the sorbent temperature was cycled between 700 and 800 °C. In addition, we found 740–850 °C for Ca2 CuO3 and 640–900 °C for CaO as the temperature swing windows of the best reaction rates. The narrower range of operational temperature (110 °C for Ca2 CuO3 compared to 260 °C for CaO) can lead to higher overall rate of CO2 uptake and release. Ca2 CuO3 showed 60% higher cycle-averaged decarbonation rate compared to CaO when cycled between the temperatures of maximum carbonation and decarbonation rates Graphical Abstract: ga1 Highlights: Three different calcium-based sorbents were synthesized by sol-gel method. The inversion temperatures of the sorbents were measured by TPC-TPDC. The experimentally determined decarbonation enthalpies agree with DFT prediction. Ca2 CuO3 showed fast regeneration when cycled between 740 and 850 °C.