Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 221, Issue -, Pages 140-151Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.08.089
Keywords
Supported photocatalyst; Amorphous titania; Partial oxidation; H-1 MAS-NMR; TEM
Funding
- Spanish Agency CICYT [MAT2013-46452-C4-2R]
- [MATERYENER3-CMS2013/MIT-2753]
Ask authors/readers for more resources
In a previous study on commercial TiO2 nanoparticles (J. Soria et al.) we had shown that the superficial disordered layers influence their textural and reactivity features. In the present work we used well crystallized anatase particles (commercial TiO2, BDH) as support of different amounts of titania powders, prepared by TiCl4 hydrolysis and constituted by nanocrystals diluted into an amorphous matrix. The reactivity of these photo catalysts has been tested for the selective oxidation of 4-methoxybenzyl alcohol to aldehyde in aqueous suspension. The catalyst characteristics have been studied using adsorption-desorption isotherms, TEM, HRTEM, TGA, PL, DRIFT-IR, and H-1 MAS-NMR spectroscopy. The results show that, though amorphous titania species hinder the photocatalyst overall reactivity, the incorporation of a low amount of those species enhances significantly the reactivity towards the partial oxidation. This effect is attributed to the fact that, during the catalyst preparation, associations between chlorine ions and hydrated excess protons structures are produced. These associations act as surfactants, separating the layer of amorphous titania chains from anatase surface so that, under catalyst irradiation, the transport of photogenerated positive charge from anatase bridging oxygens to those of the amorphous layer is favoured.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available