Interface charge density matching as driving force for new mesostructured oxovanadium phosphates with hexagonal structure, [CTA]xVOPO4·zH2O

Jamal El Haskouri, Manuel Roca, Saúl Cabrera, Jaime Alamo, Aurelio Beltrán-Porter, Daniel Beltrán-Porter, M. Dolores Marcos, Pedro Amorós

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

50 Citas (Scopus)

Resumen

Hexagonal mesostructured mixed-valence oxovanadium phosphates [CTA]xVOPO4·zH2O, in short ICMUV-2, have been synthesized through a S+I- cooperative mechanism using cationic surfactant (cetyltrimethylammonium, CTAB) rodlike micelles as a template. On the lines of the hypothesis that the driving force leading to the formation of mesostructured solids is the charge density matching at the interface between the supramolecular-organic and supramolecular-inorganic moieties, the self-assembling process between CTA+ micelles and VOPO4q- planar anions can be thought of as consequence of the adequate adjustment of the metal mean oxidation state. X-ray powder diffraction and TEM techniques show that the solids consist of hexagonal arrays of mesopores filled with surfactant, whereas spectroscopic results allow us to propose an oxovanadium phosphate bond topology similar to that observed in the NaxVOPO4·nH2O layered derivatives. The thermal behavior of the mesostructured materials has also been investigated, given that both the easy elimination of CTA+ species and their V:P = 1:1 molar ratio make ICMUV-2 solids adequate pyrolytic precursors of the (VO)2P2O7 catalyst.

Idioma originalInglés
Páginas (desde-hasta)1446-1454
Número de páginas9
PublicaciónChemistry of Materials
Volumen11
N.º6
DOI
EstadoPublicada - 1999
Publicado de forma externa

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