NDLI: Laser-induced luminescence of model Fe/Al$_{2}$O$_{3}$ and Cr/Al$_{2}$O$

Content Provider	Springer Nature Link
Author	Snytnikov, V. N. Stoyavskii, V. O. Larina, T. V. Krivoruchko, O. P. Ushakov, V. A. Parmon, V. N.
Copyright Year	2008
Abstract	The laser-induced luminescence of Cr$^{3+}$ impurity ions in model Fe/Al$_{2}$O$_{3}$ and Cr/Al$_{2}$O$_{3}$ catalysts with different calcination temperatures was studied. It was found that an additional luminescence band at 770 nm appeared in the luminescence spectra of low-temperature samples as a result of the interaction of octahedrally coordinated Cr$^{3+}$ ions with Fe$^{3+}$ impurity ions. In the θ-Al$_{2}$O$_{3}$ phase with a concentration of Cr$^{3+}$ ions higher than 0.1 wt %, the interaction of the Cr$^{3+}$-Cr$^{3+}$ ion pairs in the immediate surroundings resulted in the appearance of N $_{θ}$ lines due to the splitting of R $_{θ}$ lines. The differences of these lines from the N $_{α}$ lines of α-Al$_{2}$O$_{3}$ were related to the individuality of the crystal lattice of the θ phase and the coordination of Cr$^{3+}$ impurity ions in the immediate surroundings, which is different from that in the α phase. Based on the laser-induced luminescence spectroscopic data, it was found that regions with a local Cr$^{3+}$ concentration higher than the average Cr$^{3+}$ concentration in the bulk of a catalyst by one order of magnitude were formed in the α-Al$_{2}$O$_{3}$-Fe$_{2}$O$_{3}$ system with the bulk Fe and Cr concentrations of 2.5 and 0.04 wt %, respectively, which was calcined at 1220°C, as a result of the diffusion of chromium and iron ions.
Starting Page	291
Ending Page	298
Page Count	8
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	49
Issue Number	2
e-ISSN	16083210
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-01-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Catalysis
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis Modeling and Simulation Computer Science Applications

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