以水热法制备的碳球为模板,经尿素水解和煅烧活化获得具有中空笼球结构的纳米CaO,该纳米CaO经高温活化后能有效克服普通商业CaO高温下循环吸附CO₂时易烧结失活的问题。在同步热分析仪上对其吸脱附性能进行了评估,结果表明,中空笼球结构有利于CO₂的扩散与传质,从而增强吸附反应的进行;在850℃下活化3 h后获得的吸附剂具有最好的热稳定性;其CO₂最大吸附量可达0.696 4 g_CO2/(g吸附剂),且在经历50次吸脱附循环后,仍能保持理论吸附量的64.5%。

Carbon spheres prepared through hydrothermal method are used as the template,nano-CaO adsorbent with a hollow caged spherical structure is prepared via urea hydrolysis and activation at a high temperature.The prepared nano-CaO can effectively solve the problem that ordinary commercial CaO is prone to sintering and deactivation when circulating and adsorbing CO₂ at high temperature.Its performance in cyclic adsorption and desorption of CO₂ is evaluated on a synchronous thermal analyzer.The results indicate that its hollow caged spherical structure is conducive to the mass transfer and diffusion of CO₂,which enhances the adsorption kinetics.The adsorbent that has been activated at 850℃ for 3 h has the best thermal stability,whose maximum adsorption capacity to CO₂ can reach 0.696 4 g·g^-1.It can maintain 64.5% of its theoretical adsorption capacity after 50 cycles of adsorption and desorption.

陈秋月(1995-),女,硕士研究生,研究方向为高温CO₂吸附,qiuyue_c@163.com