Journal of the Chemical Society - Faraday Transactions p. 1519 - 1522 (1995)
Update date:2022-08-16
Topics:
Simon, Simion
Pol, Andre van der
Reijerse, Ed J.
Kentgens, Arno P. M.
Moorsel, Geert-Jan M. P. van
Boer, Engbert de
A combined magic-angle spinning (MAS) NMR and electron paramagnetic resonance (EPR) study has been performed on Fe- and Cr-doped alumina as a function of the heat-treatment temperature.Between 300 and 600 deg C large quantities of tetra- and penta-coordinated Al were produced in porous xerogels.The penta-coordinated Al species have been found to be related to the catalytic activity.It has been found that the Fe ions accelerate the transition from γ- to α-Al2O3 and were mainly found within the alumina granules.On the other hand, Cr ions in high oxidation states (Cr(5+), Cr(6+)) hampered the transition from γ- to α-Al2O3 and it has been proposed that they are preferentially situated on the surfaces of the granules.
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