论文部分内容阅读
镁铝复合金属氧化物作为中温(250~450℃)条件下吸收增强水气变换反应的吸收剂具有较好潜力。文中通过碳酸钾浸渍增加吸收剂表面碱性以提高镁铝复合金属氧化物CO_2吸收能力。热重分析研究了煅烧温度、碳酸钾修饰量、反应温度等对其CO_2吸收能力的影响规律,结合吸收剂表征结果,得出中温下吸收剂最佳煅烧温度为400℃左右,最佳碳酸钾修饰含量为25%。利用钾修饰镁铝复合金属氧化物恒温多循环吸收解吸实验及傅里叶变换红外光谱实验结果,推测镁铝复合金属氧化物吸收剂CO_2吸收机理。研究发现钾修饰镁铝复合金属氧化物对CO_2的吸收是部分可逆的,仅通过改变CO_2分压即可完成吸收剂的部分再生。
Mg-Al composite metal oxide has better potential as an absorbent that absorbs enhanced water-gas shift reaction under the condition of medium temperature (250-450 ℃). In this paper, the alkaline surface of absorbent is increased by impregnating with potassium carbonate to improve the CO 2 absorption capacity of Mg-Al composite metal oxide. Thermogravimetric analysis of the calcination temperature, the amount of potassium carbonate modified, the reaction temperature on the CO 2 absorption capacity of the law, combined with the absorbent characterization results obtained at the intermediate temperature absorbent calcination temperature of about 400 ℃, the best potassium carbonate Modified content of 25%. The mechanism of CO_2 absorption of Mg-Al composite metal oxide absorbent was inferred by experiments of multi-cycle absorption and desorption of potassium modified Mg-Al composite metal oxide and Fourier transform infrared spectroscopy. It is found that the absorption of CO_2 by K-modified Mg-Al composite metal oxides is partially reversible, and the partial regeneration of the absorbent can be completed only by changing the partial pressure of CO_2.