Regeneration dynamics of potassium-based sediment sorbents for CO_2 capture

摘要

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 m~2·g~(-1), the pore volume of 357.5× 10~(-3) cm~3·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 m~2g~(-1), 7.45× 10~(-3) cm~3g~(-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 ℃·min~(-1). By the modified Coats-Redfern integral method, the activation energy of 40% KHCO_3 sorbents is 102.43 kJ·mol~(-1). The results obtained can be used as basic data for designing and operating CO_2 capture process.