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Rationalization of the X-ray photoelectron spectroscopy of aluminium phosphates synthesized from different precursors

Bemmer, Victoria, Bowker, Michael, Carter, James H., Davies, Philip R., Edwards, Lee E., Harris, Kenneth D. M., Hughes, Colan E., Robinson, Fiona, Morgan, David J. and Thomas, Matthew G. 2020. Rationalization of the X-ray photoelectron spectroscopy of aluminium phosphates synthesized from different precursors. RSC Advances 10 (14) , p. 84448452. 10.1039/C9RA08738A

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Abstract

The aim of this paper is to clarify the assignments of X-ray photoelectron spectra of aluminium phosphate materials prepared from the reaction of phosphoric acid with three different aluminium precursors [Al(OH)3, Al(NO3)3 and AlCl3] at different annealing temperatures. The materials prepared have been studied by X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), infrared spectroscopy and high-resolution solid-state 31P NMR spectroscopy. A progressive polymerization from orthophosphate to metaphosphates is observed by XRD, ATR-FTIR and solid state 31P NMR, and on this basis the oxygen states observed in the XP spectra at 532.3 eV and 533.7 eV are assigned to P–O–Al and P–O–P environments, respectively. The presence of cyclic polyphosphates at the surface of the samples is also evident.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Royal Society of Chemistry
ISSN: 2046-2069
Funders: EPSRC
Date of First Compliant Deposit: 12 March 2020
Date of Acceptance: 10 February 2020
Last Modified: 11 Sep 2020 09:10
URI: http://orca.cf.ac.uk/id/eprint/130379

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