DRIFTS study of the surface structure and nitridation process of mixed galloaluminophosphate oxynitride (AlGaPON) catalysts

Centeno, MA;Delsarte, Stéphanie;Grange, Paul
(1999) The Journal of Physical Chemistry Part B: Materials, Surfaces, Interfaces & Biophysical — Vol. 103, n° 34, p. 7214-7221 (1999)

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Authors
  • Centeno, MA
    Author
  • Delsarte, StéphanieUCLouvain
    Author
  • Grange, PaulUCLouvain
    Author
Abstract
The spectra of high surface area amorphous oxide AlPO, AlGaPO, and GaPO were compared with those of high surface amorphous oxynitrides AlPON and AlGaPON with similar O/N ratio and with that of the nitride GaN. This allowed us to make a correct assignation of the bands in their IR vibrational spectra, especially those in the new family of solids named galloaluminophosphate oxynitride, AlGaPON. The substitution of aluminum atoms by gallium induces a shift of the framework band vibrations due to a second-neighbor effect. The introduction of nitrogen in the network of the oxide phosphate produces a broadening and poor definition of the structural bands due to a collapse of the structure. NH4+, coordinated NH3, -NH2, and -NH- species are identified on the surface of the AlGaPON solid. A thermal treatment under NH3 allows us to propose the following nitridation sequence: M-O-NH4+ and/or M-NH3 --> M-NH2 --> M-NH-M --> N3-.
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Centeno, M., Delsarte, S., & Grange, P. (1999). DRIFTS study of the surface structure and nitridation process of mixed galloaluminophosphate oxynitride (AlGaPON) catalysts. The Journal of Physical Chemistry Part B: Materials, Surfaces, Interfaces & Biophysical, 103(34), 7214-7221. https://doi.org/10.1021/jp990699z (Original work published 1999)