采用浸渍法制备不同负载量的碱土金属（MgCl₂、CaBr₂、MgBr₂）改性MCM-41复合材料，并在固定床上进行氨气吸附实验。利用XRD、BET、SEM、TEM对吸附剂进行表征，并研究其在高温下对氨气吸附的性能。结果表明，氨气吸附容量随着温度的升高而减小，随着金属盐负载量的增大先增加后减少。对于MgCl₂和MgBr₂复合材料，负载量为40%时吸附容量达到最大；CaBr₂负载量为30%时达到最高，但其在300℃时吸附容量呈上升趋势。镁盐比钙盐吸附氨气的能力强，溴化物比氯化物的吸附容量大，MgBr₂配位数比其他盐大。200℃下负载量为40%的MgBr₂/MCM-41吸附量最高。

Alkaline earth metal salts (MgCl₂,CaBr₂,MgBr₂) are loaded on MCM-41 at various amount via impregnation method.Adsorption experiments of ammonia by the modified MCM-41 are carried out in a fixed bed column.The modified MCM-41 is characterized by XRD,BET,SEM/TEM,and its adsorption performance to ammonia at high temperature is studied.It is shown that its adsorption capacity to ammonia decreases with the increasing temperature,but increases firstly and decreases then with the increasing content of metal salts.For the adsorbents modified by MgCl₂ and MgBr₂,the maximum adsorption capacity to ammonia is achieved at a loading amount of 40%.The optimal loading content for CaBr₂ is 30%,but the adsorption capacity of CaBr₂ modified MCM-41 to ammonia can increase at 300℃.Generally,magnesium salts have stronger adsorption ability to ammonia than calcium salts,while bromides have larger adsorption capacity than chlorides.MgBr₂ has a larger coordination number than other salts.At 200℃,the highest adsorption capacity has been achieved by MgBr₂/ MCM-41 with 40% loading content.

刘作松(1994-),男,硕士研究生,研究方向为催化与分离,1154174921@qq.com