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Based on a review of the FP research and commissioning structures, at least three levels of objectives can be identified as relevant to many of the transport research projects commissioned under past two Framework Programmes.
The Cu ions neighbouring two framework Al atoms (site I), and forming mostly mononitrosyl complexes, which dominate in erionite structure, provide a high activity in selective reduction of NO.
This Lewis acidity decrease also reflects the fact that the strongest Lewis acid sites found in 3D zeolite − the channel-intersection sites (coordinated with two framework oxygens only) − are not present in 2D-MFI.
We have studied the reactivity towards dihydrogen of Ni2+ Ni+ reduced ions, residing above two framework oxygen atoms, using a 18 SiO4 tetrahedrals (18T) model cluster representing the intersection of the straight and the sinusoidal channels in ZSM-5 zeolite.
This Cu site preferably forms Cu+ dinitrosyl complexes and exhibits high stability of Cu+ even in oxygen at high temperature (720 K) compared to the other Cu ions with higher positive charges, which are suggested to be balanced by two framework AI atoms.
For oxo-bridged [Fe, Fe] species, the Fe Fe and Fe–O distances in Configurations a, b, c, d, e1 and f were more consistent with experimental (ca. 2.53 or 3.06 Å) than in the cluster models designed by Yakovlev et al. with two framework Al atoms nearby.
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I'm going to give you two frameworks.
The Think project calls for two frameworks of steel lattice in approximately the same locations as the original towers, but without touching their footprints.
Mental health and coronary heart disease were the first two frameworks to be produced, as they are significant causes of illness and disability.
However, there are some differences between the two frameworks.
These two frameworks have their own merits and demerits.
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