Regeneration dynamics of potassium-based sediment sorbents for CO2 capture

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)center dot g(-1), the pore volume of 357.5x10(-3) cm(3)center dot 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(2)g(-1), 7.45x10(-3) cm(3)g(-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 A degrees C center dot min(-1). By the modified Coats-Redfern integral method, the activation energy of 40% KHCO3 sorbents is 102.43 kJ center dot mol(-1). The results obtained can be used as basic data for designing and operating CO2 capture process.