CO2 capture from fluid catalytic crackers via chemical looping combustion: Regeneration of coked catalysts with oxygen carriers. (April 2023)

• Record Type: Journal Article
• Authors: Güleç, Fatih; Meredith, Will; Snape, Colin E.
• Is Part Of: Journal of the Energy Institute. Volume 107(2023)
• Publication Date: 2023-04
• Subjects: Chemical looping combustion -- Advanced combustion -- Fluid catalytic cracking -- CO2 capture -- Oxygen carrier; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2023.101187
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: Oil refineries are responsible for ∼5% of total global CO2 emissions and approximately 25–35% of these emissions are released from a single unit called Fluid Catalytic Cracking (FCC). Chemical Looping Combustion (CLC) has been recently proposed as a novel CO2 capture method from the regenerator of FCC units as an integrated process of CLC-FCC. In this study, for the first time, the combustion behaviour of three types of cokes, a model FCC coke (which is a low volatile semi-anthracite coal), and cokes deposited on commercial FCC catalysts by n-hexadecane cracking and Vacuum Gas Oil, were comprehensively investigated with oxygen carriers (Co3 O4, CuO, and Mn2 O3 ) in a fixed-bed reactor at 700–850 °C. The results demonstrate that a high coke combustion efficiency was achieved with CuO (98 vol %), Co3 O4 (91 vol %), and Mn2 O3 (91 vol %) at 800 °C for 30 min. CuO was the most effective oxygen carrier, at temperatures greater than 750 °C for 45 min of residence time. These are the regeneration conditions used in the conventional FCC regenerators. Highlights: Demonstrated the applicability of CLC for the regeneration of FCC catalysts. > 91 vol% combustion of coke achieved with Co3 O4 and Mn2 O3 at 800 °C. > 93 vol% combustion of coke achieved with CuO at 750 °C.