About

The Instituto de Ciencia de Materiales de Madrid (ICMM) is an institute of the Consejo Superior de Investigaciones Cientificas (CSIC) (Spanish National Research Council) founded in December 1986, that belongs to the Area of Science and Technology of Materials, one of the eight Areas in which the CSIC divides its research activities.

 

Our mission is to create new fundamental and applied knowledge in materials of high technological impact, their processing and their transfer to the productive sectors at local, national and European scales (the true value of materials is in their use), the training of new professionals, and the dissemination of the scientific knowledge.

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Forthcoming Events

FEB22/12:00

Buckling, ripples and dynamical phenomena in suspended graphene
Luis Bonilla  read more

MAR02/10:30

Quantum dots and superconductivity in silicon systems
Floris Zwanenburg  read more

MAR15/12:00

The Nobel Prize in Physics 2017:
Spacetime ripples and flashes of light

José Antonio Font  read more

Anatase photocatalyst with supported low crystalline TiO2: The influence of amorphous phase on the activity

M. J. Torralvo, J. Sanz, I. Sobrados, J. Soria, C. Garlisi, G. Palmisano, S. Çetinkaya, S. Yurdakal and V. Augugliaro

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 photocatalysts 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 1H 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.

Applied Catalysis B: Environmental, 2018

ICMM-2018 - Sor Juana Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, Spain. Tel: +34 91 334 9000. info@icmm.csic.es