Nature and Structure of High Silica Zeolites Synthesized in Presence of (Poly) Alkyl Mono- and Diamines
1985; Elsevier BV; Linguagem: Inglês
10.1016/s0167-2991(08)65268-4
ISSN2542-6613
AutoresZ. Gabélica, M. Cavez-Bierman, P. Bodart, A. Gourgue, J.B. Nagy,
Tópico(s)Chemical Synthesis and Characterization
ResumoVarious aluminosilicate hydrogels having the composition 106 SiO2. 26 Na2O, Al2O3. 17.3 H2SO4.. 47 NaCl. 2400 H2O. 9 R, where R is a mono- di- or trialkylamine, a diaminoalkane or a tetraalkylammonium (Alk4N+) cation, have been left to crystallize in sealed Pyrex autoclaves at 140°C. The resulting crystalline zeolitic phaases were analyzed by a variety of techniques: PIGE, XRD, IR, SEM and solid state 29Si- and 27Al-NMR. Particular emphasis was put on the advantage to use in combination high resolution solid state 13C-NMR and simultaneous TG-DTA-DTG techniques to characterize the nature and structure of the organic molecule entrapped within each zeolitic lattice. Typical examples showing the influence of the geometry and/or of the length of the alkyl chain(s) of the amine or Alk4N+ cations, in directing either specific ZSM-5 or ZSM-11 structures or random ZSM-5/11 mixtures (or intergrowths), are presented and discussed.
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