Alkali interactions with a calcium manganite oxygen carrier used in chemical looping combustion
Artikel i vetenskaplig tidskrift, 2022

Chemical-Looping Combustion (CLC) of biofuels is a promising technology for cost-efficient CO2 separation and can lead to negative CO2 emissions when combined with carbon capture and storage. A potential challenge in developing CLC technology is the effects of alkali metal-containing compounds released during fuel conversion. This study investigates the interactions between alkali and an oxygen carrier (OC), CaMn0.775Ti0.125Mg0.1O3-δ, to better understand the fate of alkali in CLC. A laboratory-scale fluidized bed reactor is operated at 800–900 °C in oxidizing, reducing and inert atmospheres to mimic CLC conditions. Alkali is fed to the reactor as aerosol KCl particles, and alkali in the exhaust is measured online with a surface ionization detector. The alkali concentration changes with gas environment, temperature, and alkali loading, and the concentration profile has excellent reproducibility over repeated redox cycles. Alkali-OC interactions are dominated by alkali uptake under most conditions, except for a release during OC reduction. Uptake is significant during stable reducing conditions, and is limited under oxidizing conditions. The total uptake during a redox cycle is favored by a high alkali loading, while the influence of temperature is weak. The implications for the understanding of alkali behavior in CLC and further development are discussed.

Surface ionization detector

Oxygen carrier

Chemical looping combustion



Viktor Andersson

Göteborgs universitet

Amir H Soleimani Salim

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Xiangrui Kong

Göteborgs universitet

Henrik Leion

Chalmers, Kemi och kemiteknik, Energi och material

Tobias Mattisson

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Jan B. C. Pettersson

Göteborgs universitet

Fuel Processing Technology

0378-3820 (ISSN)

Vol. 227 107099

Förbränningskemi för biomassa med syrebärarmaterial

Vetenskapsrådet (VR) (2016-06023), 2017-01-01 -- 2024-12-31.


Kemiska processer

Annan kemiteknik




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