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The synthesis and properties of synthetic zeolite Linde Q

Authors
Journal
Zeolites
0144-2449
Publisher
Elsevier
Publication Date
Volume
11
Issue
2
Identifiers
DOI: 10.1016/0144-2449(91)80404-n
Keywords
  • Hydrothermal Crystallization
  • Dealumination
  • Ion Exchange
  • Masn.M.R. Spectroscopy
  • Infrared Spectroscopy
Disciplines
  • Physics

Abstract

The purest and most crystalline samples of zeolite Linde Q are obtained at low temperature (64 °) and long synthesis time (2 months). Crystallization occurs after the formation of an amorphous solid gel. The mid-infrared spectrum of as-synthesized Linde Q is structure-specific. Linde Q is the first reported aluminosilicate framework structure with Si/Al = 1 and T-O-T bond angles near 180 °, allowing an investigation of the overall effect of the variation of the electronegativity of the O-Al group with varying Si-O-Al bond angles. From 29Si MAS n.m.r. results, it was concluded that this overall effect is the same for both types of Si-O-T (T = Si or Al) linkages. 29Si and 27Al MAS n.m.r. spectroscopic investigations of cation-exchanged and dealuminated samples give evidence that framework destruction is not associated with the breaking of bridging bonds between neighboring hexagonal sheets.

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