Synthesis and characterization of Ge-ZSM-5 zeolites

Autor:	H. Kosslick, W. Pilz, Vu Anh Tuan, Ch. Peuker, W. Storek, R. Fricke
Rok vydání:	1993
Předmět:	General Engineering chemistry.chemical_element Germanium Crystal structure Molecular sieve Crystallography symbols.namesake Adsorption chemistry Lattice (order) symbols Physical and Theoretical Chemistry ZSM-5 Zeolite Raman spectroscopy
Zdroj:	The Journal of Physical Chemistry. 97:5678-5684
ISSN:	1541-5740 0022-3654
Popis:	Ge-ZSM-5 zeolites have been synthesized and characterized by SEM, n-hexane adsorption, XRD, MAS NMR, IR, and Raman spectroscopy. Despite the large size of the germanium atoms, up to 12.8 Ge/unit cell could be incorporated into the MFI framework. In order to rationalize this, a site preference of the germanium atoms in the lattice is proposod. Although a large amount of germanium is incorporated, only small changes in the unit cell parameters and lattice vibration frequencies are observed, suggesting that the T-T and T-O distances in the framework are nearly unchanged. However, the T-O-T deformation band is significantly broadened and shifted to higher wavenumber. From these findings it is deduced that the incorporation of germanium leads mainly to a decrease in the T-O-T angle
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::73ac64bd869815c462abe8aa668a0983 https://doi.org/10.1021/j100123a036 Zobrazit plný text záznamu