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Formation and Properties of Losod, a New Sodium Zeolite

1974; Wiley; Volume: 57; Issue: 6 Linguagem: Inglês

10.1002/hlca.19740570608

1522-2675

Werner Sieber, W.M. Meier,

Chemical Synthesis and Characterization

Abstract Losod, a new type of crystalline hydrated sodium aluminosilicate, Na 12 Al 12 Si 12 O 48 · q H 2 O, has been prepared from reaction mixtures containing bulky quaternary alkylammonium ions, particularly azonia‐spiro[4.4]nonane, besides sodium ions. Losod crystallizes from batches with a low sodium content (Na/Al ≤ 1 and Si/Al ≈︁ 1). The quaternary ammonium hydroxide primarily serves as a source of hydroxide ions and is not incorporated into the zeolite crystals. These bulky bases provide a useful means for controlling the alkalinity of the system independently of the concentration of the necessary cations built into the zeolite. The crystals of Losod are hexagonal ( a = 12.91 and c = 10.54 Å) and the proposed framework structure shows a polytypic relationship to sodalite and cancrinite. Losod has reversible sorption and ion exchange properties typical of a small‐pore zeolite and in essential agreement with the proposed structure.