Li-LSX分子筛的Ag~+改性及其氧气吸附性能
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摘要
采用离子交换法对Li-LSX分子筛进行Ag~+改性,利用正交实验法探究制备AgLi-LSX分子筛的最佳工艺条件,通过不同交换次数获得了不同阳离子交换度的AgLi-LSX分子筛,并采用SEM、TEM、FTIR、XRD、ICP、EDS、BET等手段对分子筛的骨架结构、晶体构型、元素含量、孔结构进行表征。结果表明,AgLi-LSX分子筛的最佳制备工艺条件为反应温度90℃,反应时间120 min,Ag~+浓度0.4 mol/L。当交换次数为2次,Ag~+交换度为51.67%时,AgLi-LSX分子筛的氧气吸附量为4.473 5 mL/g,比Li-LSX分子筛提高了96.91%,并且Ag~+改性并没有改变X型分子筛的骨架结构和晶体构型。
The Li-LSX molecular sieves were modified by Ag~+ion exchange,and the optimum experimental conditions for preparing AgLi-LSX molecular sieves were investigated by orthogonal experiments.AgLi-LSX molecular sieves with different exchange degrees were obtained by different modification times,and the molecular structure,crystal structure,element content and pore structure of the molecular sieve were characterized by SEM,TEM,FTIR,XRD,ICP,EDS,BET.The results showed that the optimum conditions for the molecular sieves modification were as follows:reaction temperature 90 ℃,reaction time 120 min and Ag~+concentration 0.4 mol/L.When the number of ion exchange was two,the Ag~+exchange degree was 51.67%.At the same time,the oxygen adsorption capacity of AgLi-LSX molecular sieve was 4.473 5 mL/g,which was 96.91% higher than that of the unmodified Li-LSX molecular sieve.Besides the Ag~+modification did not change the framework structure and crystal configuration of the X-type zeolite.
The Li-LSX molecular sieves were modified by Ag~+ion exchange,and the optimum experimental conditions for preparing AgLi-LSX molecular sieves were investigated by orthogonal experiments.AgLi-LSX molecular sieves with different exchange degrees were obtained by different modification times,and the molecular structure,crystal structure,element content and pore structure of the molecular sieve were characterized by SEM,TEM,FTIR,XRD,ICP,EDS,BET.The results showed that the optimum conditions for the molecular sieves modification were as follows:reaction temperature 90 ℃,reaction time 120 min and Ag~+concentration 0.4 mol/L.When the number of ion exchange was two,the Ag~+exchange degree was 51.67%.At the same time,the oxygen adsorption capacity of AgLi-LSX molecular sieve was 4.473 5 mL/g,which was 96.91% higher than that of the unmodified Li-LSX molecular sieve.Besides the Ag~+modification did not change the framework structure and crystal configuration of the X-type zeolite.
引文
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[2]滕燕程.吸附法分离空气技术进展[J].化学推进剂与高分子材料,1993(1):7-13.
[3]周静茹,裴丽霞,张立志.选择性气体吸附剂的研究进展[J].化工新型材料,2012,40(1):18-20.
[4]Weinberger B,Lamari F D,Kayiran S B,et al.Molecular modeling of H2purification on Na-LSX zeolite and experimental validation[J].Aiche Journal,2010,51(1):142-148.
[5]左蕊,梁小平,朱孟府,等.离子交换法制备Ce-NaX沸石分子筛及其结构表征[J].材料导报:研究篇,2013,27(20):40-43.
[6]Baksh M S A,Kikkinides E S,Yang R T.Lithiumtype Xzeolite as a superior sorbent for air separation[J].Separation Science and Technology,1992,27(3):277-294.
[7]Lagree D A,Leavitt F W.Pressure swing adsorption process for gas separation:US,4810265[P].1989-03-07.
[8]Cavenati S,Grande C A,Lopes F V S,et al.Adsorption of small molecules on alkali-earth modified titanosilicates[J].Microporous and Mesoporous Materials,2009,121(1/2/3):114-120.
[9]Hutson N D,Yang R T.Structural effects on adsorption of atmospheric gases in mixed Li Ag-X zeolite[J].Aiche Journal,2000,46(11):2305-2317.
[10]关莉莉,段连运,谢有畅.几种二价阳离子的交换对13X分子筛氮氩分离性能的影响[J].无机化学学报,2004,20(11):1273-1278.
[11]庞文琴.分子筛与多孔材料化学[M].北京:科学出版社,2005.
[12]Kong F T,Jing X,Jie C,et al.Carbon deposition on Co catalysts during Fischer-Tropsch synthesis:A computational and experimental study[J].Journal of Catalysis,2010,274(2):121-129.
[13]崔邑诚,张爱民,董家騄,等.Li-LSX沸石中阳离子分布与空分性能的研究[J].化学学报,2003,61(3):350-353.
[14]Radak V M,Ceranic T S,Zivadinovic I M.Chem inform abstract:Influence of the exchangeable monovalent cations on vibrations of Y zeolite framework[J].Chemischer Informationsdienst,1978,9(51):1116-1119.
[15]许乃才,洪天增,刘忠,等.介孔氧化铝的可控制备及优异除氟性能[J].材料导报:研究篇,2017,31(6):45-49.
[16]江明明,朱孟府,邓橙,等.Li X沸石分子筛的铈离子改性研究[J].应用化工,2017,46(2):332-334.
[17]Feuerstein M,Lobo R F.Characterization of Li cations in zeolite Li X by solid-state NMR spectroscopy and neutron diffraction[J].Chemistry of Materials,1998,10(10):2197-2204.
[18]王春蓉.沸石分子筛离子交换的方法及应用研究[J].矿冶,2011,20(2):52-54.
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