Calcium Looping: On the Positive Influence of SO and the Negative Influence of HO on CO Capture by Metamorphosed Limestone-Derived Sorbents.

The CO capture performance of sorbents derived from three distinct limestones, including a metamorphosed limestone, is studied under conditions relevant for calcium looping CO capture from power plant flue gas. The combined and individual influence of flue gas HO and SO content, the influence of textural changes caused by sequential calcination/carbonation cycles, and the impact of CaSO accumulation on the sorbents' capture performance were examined using bubbling fluidized bed reactor systems. The metamorphosed limestone-derived sorbents exhibit atypical capture behavior: flue gas HO negatively influences CO capture performance, while limited sulfation can positively influence CO capture, with space time significantly impacting CO and SO co-capture performance.