利用工业级原料合成低硅铝比X沸石分子筛
|
摘要
采用工业级原料偏铝酸钠和水玻璃用两步水热法制备出低硅铝比X型沸石分子筛(LSX),降低了合成成本。实验结果表明,合成的LSX沸石分子筛结晶好,为纯相,呈棱柱形貌,且具有很好的吸附性能。考察了反应温度、时间和碱度对合成的影响,与一步合成法相比,两步水热法反应时间更短,更容易生成纯相的LSX沸石分子筛。碱度升高会导致方钠石(SOD)的生成,碱度降低更有利于A型沸石分子筛的生长。
LSX zeolite was prepared from industrial source( sodium aluminate and water glass) which could decreased the synthesized cost. The synthesized pure LSX zeolite had well crystallinity and ability of adsorption. The reaction temperature and alkalinity were examined. Compared to direct synthesis,the two-step synthesis method had shorter reaction time and the pure LSX zeolite could be prepared easily. The SOD would be obtained with high alkalinity and A zeolite favor to grow in low alkalinity.
LSX zeolite was prepared from industrial source( sodium aluminate and water glass) which could decreased the synthesized cost. The synthesized pure LSX zeolite had well crystallinity and ability of adsorption. The reaction temperature and alkalinity were examined. Compared to direct synthesis,the two-step synthesis method had shorter reaction time and the pure LSX zeolite could be prepared easily. The SOD would be obtained with high alkalinity and A zeolite favor to grow in low alkalinity.
引文
[1]Yan C X,Wang C Q,Yao J F,et al.Adsorption of methylene blue on mesoporous carbons prepared using acid and alkaline-treated zeolite X as the template[J].Colloids and Surfaces A,2009,333(1-3):115-119.
[2]Palonmino G T,Arean C O,Carayol M R.Hydrogen adsorption on the faujasite-type zeolite Mg-X:An IR spectroscopic and thermodynamic study[J].Applied Surface Science,2010,256(17):5281-5284.
[3]Yoshida S,Hirano S,Harada A,et al.Nitrogen adsorption properties of cubic and orthorhombic Li-exchanged low silica X[J].Micropor.Mesopor.Mater.,2001,46(2-3):203-209.
[4]Martin B,Shen D M.Sorption kinetics of atmospheric gases on Li,RE(rare earth)-LSX zeolite beads as sorbents for oxygen PVSA processes[J].Micropor.Mesopor.Mater.,2007,105(1-2):163-169.
[5]Zanota M L,Heymans N,Gilles F,et al.Thermodynamic study of Li Na KLSX zeolites with different Li exchange rate for N2/O2separation process[J].Micropor.Mesopor.Mater.,2011,143(2-3):302-310.
[6]Masini J J,Plee D.Exchanged zeolites X in particular exchanged with Lithium,their process of preparation and their use as adsorbents of nitrogen in the separation of the gases of the air[P].US,6806219B2,2004.
[7]Esposito S,Ferone C,Pansini M.A comparative study of the thermal transformations of Ba-exchanged zeolites A,X and LSX[J].J.Eur.Ceram.Soc.,2004,24(9):2689-2697.
[8]Urbutis A,Kitrys S.Dual function adsorbent-catalyst Cu O-Ce O2/Na X for temperature swing oxidation of benzene,toluene and xylene[J].Cent.Eur.J.Chem.,2014,12(4):492-501.
[9]国家标准局.GB6287-86分子筛静态水吸附测定方法[S].1987.
[10]蒋化,唐伟,赵壁英,等.最低硅铝比八面沸石MAX合成条件的研究[J].高等学校化学学报,2002,23(5):772-776.
[11]Pope C G.Nucleation and growth theory in zeolite synthesis[J].Micropor.Mesopor.Mater.,1998,21(4-6):333-336.
[2]Palonmino G T,Arean C O,Carayol M R.Hydrogen adsorption on the faujasite-type zeolite Mg-X:An IR spectroscopic and thermodynamic study[J].Applied Surface Science,2010,256(17):5281-5284.
[3]Yoshida S,Hirano S,Harada A,et al.Nitrogen adsorption properties of cubic and orthorhombic Li-exchanged low silica X[J].Micropor.Mesopor.Mater.,2001,46(2-3):203-209.
[4]Martin B,Shen D M.Sorption kinetics of atmospheric gases on Li,RE(rare earth)-LSX zeolite beads as sorbents for oxygen PVSA processes[J].Micropor.Mesopor.Mater.,2007,105(1-2):163-169.
[5]Zanota M L,Heymans N,Gilles F,et al.Thermodynamic study of Li Na KLSX zeolites with different Li exchange rate for N2/O2separation process[J].Micropor.Mesopor.Mater.,2011,143(2-3):302-310.
[6]Masini J J,Plee D.Exchanged zeolites X in particular exchanged with Lithium,their process of preparation and their use as adsorbents of nitrogen in the separation of the gases of the air[P].US,6806219B2,2004.
[7]Esposito S,Ferone C,Pansini M.A comparative study of the thermal transformations of Ba-exchanged zeolites A,X and LSX[J].J.Eur.Ceram.Soc.,2004,24(9):2689-2697.
[8]Urbutis A,Kitrys S.Dual function adsorbent-catalyst Cu O-Ce O2/Na X for temperature swing oxidation of benzene,toluene and xylene[J].Cent.Eur.J.Chem.,2014,12(4):492-501.
[9]国家标准局.GB6287-86分子筛静态水吸附测定方法[S].1987.
[10]蒋化,唐伟,赵壁英,等.最低硅铝比八面沸石MAX合成条件的研究[J].高等学校化学学报,2002,23(5):772-776.
[11]Pope C G.Nucleation and growth theory in zeolite synthesis[J].Micropor.Mesopor.Mater.,1998,21(4-6):333-336.