Regeneration dynamics of potassium-based sediment sorbents for CO₂ capture

Abstract

Simulating regeneration tests of Potassium-Based sorbents that supported by Suzhou River Channel Sediment were carried out in order to obtain parameters of regeneration reaction. Potassium-based sediment sorbents have a better morphology with the surface area of 156.73 m²·g⁻¹, the pore volume of 357.5×10⁻³ cm³·g⁻¹ and the distribution of pore diameters about 2–20 nm. As a comparison, those of hexagonal potassium-based sorbents are only 2.83 m²g⁻¹, 7.45×10⁻³ cm³g⁻¹ and 1.72–5.4 nm, respectively. TGA analysis shows that the optimum final temperature of regeneration is 200 and the optimum loading is about 40%, with the best heating rate of 10 °C·min⁻¹. By the modified Coats-Redfern integral method, the activation energy of 40% KHCO₃ sorbents is 102.43 kJ·mol⁻¹. The results obtained can be used as basic data for designing and operating CO₂ capture process.