【摘要】 本研究以煤基活性炭产品为原料，尿素作为氮源，通过浸渍、高温活化的方法进行改性，开发了一款可用于煤制氢/重整制氢中温变换气中CO₂脱除的煤基富氮活性炭，并对其进行结构及性能表征。其中性能最优样品U-80C-N-550，其表面氮含量为9.92%,N/O比1.22，水接触角为137.92°±1.24°。在测试条件为99.99%CO₂气氛，200?C温度，1 MPa压力下，CO₂吸附容量可以达到1.27 mmol/g，且在进行40次吸附解吸循环过程中CO₂吸附量基本保持不变，循环稳定性好。结果表明，不同条件下制备的富氮活性炭样品表面含氮基团含量及种类不同，因此通过改变吸附剂制备工艺条件，可适当调控活性炭表面含氮基团的种类及含量，从而提高其CO₂吸附性能的同时增强其疏水性，得到了适合于含水蒸气富氢气体中脱除CO₂的吸附剂。更多还原

【Abstract】 In this study,a coal-based nitrogen-rich activated carbon that can be used for CO₂removal from elevated temperature shift gas of hydrogen production from coal/steam reforming was developed using coal-based activated carbon products as raw materials,urea as nitrogen source,and modified by impregnation and high-temperature activation methods,and its structure and performance were characterized.Among them,the best performance sample was U-80C-N-550,which surface nitrogen content is 9.92%,N/O ratio is 1.22,and water contact angle is 137.92°±1.24°.The adsorption capacity of CO₂reached 1.27 mmol/g and good cyclic stability that CO₂capacity basically remains unchanged during 40 cycles of adsorption and desorption were obtained under 99.99%CO₂atmosphere,200?C temperature and 1 MPa pressure working condition.Results showed that nitrogen content of nitrogen molecules and types on the surface of activated carbon samples were different,varying from different preparation conditions.Therefore,CO₂adsorption performance and its hydrophobicity would be enhanced by maneuver of preparation processes and appropriately controlling the types of activated carbon surface nitrogen molecules and content,in order to synthesis CO₂adsorbents that are suitable for CO₂removal from industrial hydrogen-rich gas mixture containing vapor.更多还原