竹基活性炭强化二乙醇胺水溶液吸收CO2的性能OA

The large diffusion resistance of CO2 in aqueous diethanolamine(DEA)solution is the primary factor resulting in its slow absorption rate.By introducing a small amount of bamboo-based activated carbon(BAC),the diffusion resistance of CO2 in 30%DEA-H2O is significantly reduced,thereby effectively enhancing the CO2 absorption rate.In this study,five types of BAC with different pore size distributions were prepared by adjusting the mass ratio of bamboo charcoal(BC)to the activator of potassium hydroxide(KOH).The hybrid sorbent of 30%DEA-BAC-H2O for CO2 absorption(adsorption)was developed.CO2 absorption(adsorption)capacity,rate,and desorption enthalpy of the hybrid sorbent were systematically measured,calculated as well as compared with the commercial absorbents.The results showed that when the mass ratio of BC to KOH was 1∶2(denoted as BAC1∶2),BAC1∶2 exhibited a well-developed specific surface area and micropore volume(pore size≤1nm).Under this condition,the CO2 absorption(adsorption)rate in 30%DEA-1%BAC1∶2-H2O was 7 times and 3.5 times those of 30%DEA-H2O and 25.5%DEA-4.5%piperazine(PZ)-H2O(a commercial absorbent),respectively.Meanwhile,CO2 absorption(adsorption)capacity of 30%DEA-1%BAC1∶2-H2O was moderate,and the CO2 desorption enthalpy was reduced by 25%compared with that of 25.5%DEA-4.5%PZ-H2O,demonstrating its potential for industrial application.