Electron crystallography of zeolites. 1. Projected crystal structures of ZSM-5 and ZSM-11
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Douglas L. Dorset
Abstract
The prospect of carrying out quantitative crystal structure analyses by direct methods with electron diffraction intensity data from zeolites is evaluated for two related materials: ZSM-5 and ZSM-11. The stacked plate-like arrays of ZSM-5 induce intensity perturbations from secondary electron scattering; nevertheless, the T-site positions can be found by direct methods. Intensity data from smaller ZSM-11 microcrystals are more favorable for ab initio analysis so that some oxygen positions are found during Fourier refinement. For intergrowths of one zeolite in the other, the nature of the inclusions has been found to depend on the dominant species. If ZSM-5 is dominant, the apparent ZSM-11 inclusions (assuming a preferred platy orientation) could be rather large, whereas if ZSM-11 is dominant, the ZSM-5 inclusions extend over only 3 or 4 unit cells.
© 2003 Oldenbourg Wissenschaftsverlag GmbH
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Articles in the same Issue
- Preparation and crystal structure of a new high-pressure phase (V0.5Re0.5)O2 with rutile-type structure
- Electron crystallography of zeolites. 1. Projected crystal structures of ZSM-5 and ZSM-11
- The structures of ZrNCl, TiOCl and AlOCl in the light of the Zintl-Klemm concept
- Single crystal neutron diffraction study of the phase transition in (NH4)H5(PO4)2
- The crystal structure of Er(HPO4)(NO3)·3 H2O: ab initio determination from X-ray powder diffraction data
- Molecular and crystal structure of 5-amino-1H-[1,2,4]triazole-3-carboxylic acid derivatives
- Synthesis and structural investigation of (4-methoxy-phenyl)-[4-(4-methoxy-phenyl)-1-(1-phenylethylidene-amino)-2-thioxo-1,2-dihydro-pyrimidin-5-yl]-methanone
- Structural and spectral studies of N-(3-hydroxypyridine-2-yl)salicylideneimine and N-(3-hydroxypyridine-2-yl)-5-bromosalicylideneimine and their dimethyltin(IV) complexes
- Synthesis, crystal structure and electrochemical behaviour of [2,6-bis(3,5-dimethylpyrazolyl)pyridine](dithiocyanato)cobalt(II)
- Crystal structure and properties of L-arginine diphosphate
- The (3 + 1)-dimensional superspace description of the commensurately modulated structure of p-chlorobenzamide (α-form) and its relation to the γ-form
- Books Received
