K2CO3/金属氧化物吸附CO2的研究

CO2 Adsorption Behavior of K2CO3/Metal Oxide Adsorbents

研究了K2CO3/MgO和K2CO3/Al2O3吸附CO2的性能。研究表明:K2CO3/MgO和K2CO3/Al2O3对CO2吸附的容量分别为105.8 mg/g和66 mg/g。吸附剂载体是钾基吸附剂吸附CO2性能差异的原因之一,MgO载体的CO2吸附容量(42.3 mg/g)大于Al2O3(20 mg/g)。钾在不同载体中的物相差异是造成CO2吸附性能差别的另一原因。在K2CO3/MgO吸附剂中,钾仅以K2CO3形式存在,在吸附CO2过程中,CO2与K2CO3以及MgO共同作用生成了K2Mg(CO3)2。而在K2CO3/Al2O3吸附剂中,不仅有K2CO3物相,还检测出KAl(CO3)2(OH)2物相,在吸附CO2过程中,K2CO3转化成KHCO3,而KAl(CO3)2(OH)2未参与CO2的吸附。

CO2 adsorption by K2CO3/MgO and K2CO3/Al2O3 adsorbents was investigated.The results indicated that CO2 adsorption capacity of K2CO3/MgO and K 2CO3/Al2O3 was 105.8 mg/g and 66 mg/g at 333 K,respectively.The nature of support played an important role for CO2 adsorption on potassium-based adsorbents.CO2 adsorption capacity of MgO(42.3 mg/g)was higher than that of Al2O3(20 mg/g).The formation of potassium phase was an important factor for CO2 adsorption on potassium-based adsorbents.Only K2CO3 was detected on K2CO3/MgO.During CO2 adsorption process on K 2CO3/MgO,K 2Mg(CO3)2 was formed by the interaction of K2CO3 with MgO.However,not only K2CO3 but also new structures of KAl(CO3)2(OH)2 were observed on K2CO3/Al2O3.In the case of CO2 adsorption on K 2CO3/Al2O3,CO2 could not adsorbed by KAl(CO3)2(OH)2.