Surface basicity of a new family of catalysts: Aluminophosphate oxynitride (AlPON)
(1995) Journal of the Chemical Society. Faraday Transactions — Vol. 91, n° 24, p. 4477-4479 (1995)
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- Abstract
- A new family of basic catalysts, amorphous aluminophosphate oxynitrides (AlPONs) with variable nitrogen content, have been synthesized by nitridation of amorphous AlPO4 (AlPO). The samples were analysed by X-ray photoelectron spectroscopy (XPS) and diffuse reflectance IR spectroscopy (DRIFTS). XPS indicates that nitrogen is preferentially bonded to phosphorus in the AlPON framework. Residual surface NH4+ ions coming from the nitridation reaction were used to evaluate the Bronsted acidity of these new catalysts. The decrease in the Bronsted acidity along the series is parallel to a shift of the P-O stretching to lower wavenumbers. Malonitrile-benzaldehyde condensation was employed as a test reaction to estimate the basicity of AlPON samples. The conversion trend observed also correlates with the decrease in the frequency of the P-O stretching. Consequently, the position of the P-O stretching reflects both the reduction of the Bronsted acidity and the enhancement of the basicity of the AlPON specimen.
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Benitez, J., Odriozola, J., Marchand, R., Laurent, Y., & Grange, P. (1995). Surface basicity of a new family of catalysts: Aluminophosphate oxynitride (AlPON). Journal of the Chemical Society. Faraday Transactions, 91(24), 4477-4479. https://doi.org/10.1039/ft9959104477 (Original work published 1995)