Zeolite synthesis in the SiO2–Al2O3–Na2O–pyridine–H2O system
Zeolite synthesis in the SiO2–Al2O3–Na2O–pyridine–H2O system
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DOI：
10.1039/f19898503623
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
W. J. Smith;J. Dewing;J. Dwyer
中科院分区：
文献类型：
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作者：
W. J. Smith;J. Dewing;J. Dwyer
本文研究了SiO_2-Al_2O_3-Na_2O-吡啶-H_2O体系中沸石的晶化。分离出三种沸石相：丝光沸石、镁碱沸石和ZSM-5。只有镁碱沸石相被吡啶分子特异性地引导。取决于反应混合物的组成，可以在不存在有机添加剂的情况下合成丝光沸石或ZSM-5。镁碱沸石相在宽范围的凝胶组合物上形成，尽管样品的产率和纯度取决于凝胶的铝含量。形成的镁碱沸石相是相对硅质的，并且都在SiO2/Al 2 O3 = 25-38的组成范围内。约2-3吡啶分子被镁碱沸石通道内的每个晶胞吸留。
The crystallisation of zeolites from the SiO2–Al2O3–Na2O–pyridine–H2O system has been investigated. Three zeolitic phases were isolated : mordenite, ferrierite and ZSM-5. Only the ferrierite phase is specifically directed by the pyridine molecules. Depending upton the composition of the reaction mixture, mordenite or ZSM-5 can be synthesised in the absence of the organic additive. The ferrierite phase is formed over a wide range of gel compositions although the yield and purity of the sample is dependent upon the aluminium content of the gel. The ferrierite phases formed are relatively siliceous and are all within the composition range SiO2/ Al2O3= 25–38. Ca. 2–3 pyridine molecules are occluded per unit cell within the ferrierite channels.