Novel regenerable potassium-based dry sorbents for CO2 capture at low temperatures

Abstract A novel potassium-based dry sorbent (KZrI) was developed for CO 2 capture at a low temperature range between 50 °C and 200 °C. The CO 2 absorption and regeneration properties of this novel regenerable potassium-based dry sorbent were measured in a fixed-bed reactor during multiple absorption/regeneration cycles at low temperature conditions (CO 2 absorption at 50–100 °C and regeneration at 130–200 °C). The total CO 2 capture capacity of the KZrI sorbent was maintained during the multiple CO 2  absorption/regeneration cycles. The XRD patterns and FTIR analyses of the sorbents after CO 2 absorption showed the KHCO 3 phase only except for the ZrO 2 phase used as support. Even after 10 cycles, any other new structures resulting from the by-product during CO 2 absorption were not observed. This phase could be easily converted into the original phase during regeneration, even at a low temperature (130 °C). The KZrI sorbent developed in this study showed excellent characteristics in CO 2 absorption and regeneration in that it satisfies the requirements of a large amount of CO 2 absorption (91.6 mg CO 2 /g sorbent) and the complete regeneration at a low temperature condition (1 atm, 150 °C) without deactivation.