摘要
硅铝沸石分子筛在吸附领域应用广泛,其亲、疏水性能对吸附性能影响较大,但硅铝沸石分子筛在不同条件下的水蒸气动态吸附性能尚不明确。采用不同硅铝比(n(SiO_(2))/n(Al_(2)O_(3))=30、135或679)的Beta分子筛(Beta-30、Beta-135和Beta-679)作为研究对象,先采用XRD、FT-IR和TG等对其进行了表征,然后在不同温度和相对湿度(HR)下分别进行了Beta-30、Beta-135和Beta-679的水蒸气吸附容量和相应动力学分析。结果表明,当温度为25℃或35℃、H_R小于80%时,Beta-679的吸附容量最低。当温度为15℃、HR为5%~10%时,Beta-679的平衡速率最快。当温度为15℃、H_R为50%~70%时,Beta-30、Beta-135和Beta-679的平衡速率表现出较大区别(Beta-135的平衡速率远小于Beta-30和Beta-679的平衡速率)。
Silica-aluminum zeolite molecular sieve is widely used in adsorption field,and its hydrophilic and hydrophobic properties have great influence on adsorption properties.Howerer,the dynamic adsorption properties of water vapor in silica-aluminum zeolite molecular sieve under different conditions are still unclear.Beta molecular sieves(Beta-30,Beta-135 and Beta-679)with different silicon to aluminum ratios(n(SiO_(2))/n(Al_(2)O_(3))=30,135 or 679)were used as research objects,and were characterized by XRD,FT-IR and TG,etc.Then the water vapor adsorption capacities and corresponding kinetics of Beta-30,Beta-135 and Beta-679 were analyzed under different temperatures and relative humidities(HR),respectively.The results show that Beta-679 has the lowest adsorption capacity when temperature is 25℃or 35℃and HR is less than 80%.The equilibrium rate of Beta-679 is the fastest when temperature is 15℃and HR is 5%to 10%.When temperature is 15℃and HR is 50%to 70%,the equilibrium rates of Beta-30,Beta-135 and Beta-679 show great difference(the equilibrium rate of Beta-135 is much smaller than that of Beta-30 and Beta-679).
作者
张学勤
白洪灏
唐轩
李世帅
杨江峰
ZHANG Xueqin;BAI Honghao;TANG Xuan;LI Shishuai;YANG Jiangfeng(School of Chemical Engineering and Technology,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Coal Chemical Branch,Coal Science and Technology Research Institute Co.,Ltd.,Beijing 100013,China;State Key Laboratory for Efficient Mining and Clean Utilization of Coal Resources,CCTEG Coal Mining Research Institute,Beijing 100013,China)
出处
《低碳化学与化工》
CAS
北大核心
2024年第11期90-96,共7页
Low-Carbon Chemistry and Chemical Engineering
基金
煤炭资源高效开采与洁净利用国家重点实验室开放基金(2021-CMCU-KF002)。
关键词
Beta分子筛
硅铝比
水蒸气吸附
动力学
Beta molecular sieves
silicon to aluminum ratios
water vapor adsorption
dynamics
