A high adsorption capacity bamboo biochar for CO2 capture for low temperature heat utilization
Yongzhen Ji, C. Zhang, Xueqiao Zhang, Pengfei Xie, Chunfei Wu, Lingchang Jiang
Abstract
Due to burgeoning carbon dioxide (CO2) emission, adsorption post-combustion capture technology gathers momentum. Cost-effective adsorbents with prominent performance draw more attention. Thus, a novel KOH activation biomass-derived activated carbon, i.e. BBC-KOH, is developed and investigated in terms of textural properties, adsorption/desorption temperatures, desorption heat and cyclic stability. A techno-economic assessment of a solar-assisted coal-fired power plant integrated with temperature swing adsorption process is conducted to evaluate potential merits in a practical application. Results demonstrate that BBC-KOH could perform an excellent adsorption capacity (1.50 mmol·g−1 at 25 °C) with a low desorption temperature (1.42 mmol·g−1 at 70 °C) and could be desorbed completely at 80 °C, i.e. 1.54 mmol·g−1. Compared with solar-assisted coal-fired power plant systems using monoethanolamine and polyethyleneimine/silica, carbon emission intensity, levelized cost of electricity and cost of CO2 removed of the system using BBC-KOH always show the best performance, corresponding to 93.22 g·kWh−1, 59.19 USD·MWh−1 and 14.12 USD·tonCO2-1, respectively. It reveals that BBC-KOH may be a potential solution to carbon capture with low capital cost, low regeneration temperature and excellent adsorption capacity.