Scholle, K.f.m.g.j.; Veeman, W.s.; Frenken, P.; Van der Velden, G.p.m.:
Characterization of intermediate TPA-ZSM-5 type structures during crystallization.
1985
In: Applied Catalysis, Jg. 17 (1985), Heft 2, S. 233 - 259
Artikel/Aufsatz in Zeitschrift / Fach: Chemie
Titel:
Characterization of intermediate TPA-ZSM-5 type structures during crystallization.
Autor(in):
Scholle, K.f.m.g.j.; Veeman, W.s. im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen; Frenken, P.; Van der Velden, G.p.m.
Erscheinungsjahr:
1985
Erschienen in:
Applied Catalysis, Jg. 17 (1985), Heft 2, S. 233 - 259
ISSN:

Abstract:

A wide range of anal. techniques (x-ray diffraction (XRD), DTA/TGA, IR, texture, SEM/TEM, and 13C, 27Al, 29Si MAS NMR) were used to characterize intermediates formed during crystn. of Pr4N ZSM-5 (TPA-ZSM-5) catalysts. Initial crystn. products are XRD-amorphous and consist of an Al-rich phase next to an increasing amt. of TPA-ZSM-5 entities with dimensions of the order of the unit cell of ZSM-5. In the final crystn. stage (.ltorsim.8 days) the TPA-ZSM-5 entities recombine to a cryst. ZSM-5 framework. A large amt. of framework defects are then still present in the XRD-cryst. TPA-ZSM-5 framework as evidenced by 29Si MAS NMR. These defects disappear upon calcination.