Fine tuning the surface acidity of titanate nanostructures

Madarász, Dániel and Szenti, Imre and Nagy, L. and Sápi, András and Kukovecz, Ákos and Kónya, Zoltán (2013) Fine tuning the surface acidity of titanate nanostructures. ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY, 19 (2-4). pp. 695-700. ISSN 0929-5607

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Abstract

The effect of protonation on the surface acidic properties of titanate nanowires (TiONWs) was investigated. Nanowires were synthesized by the alkali hydrothermal method which resulted in one dimensional nanostructures of large external surface area and well-defined lamellar interlayer structure. The Na+/H+ ratio in the structure can be tuned by ion-exchange. Our aim was to characterize the morphology of the as-synthesized nanostructures by HRTEM and SEM measurements and assess their surface acidity using in situ infrared spectroscopic measurements and temperature programmed desorption. It was found that the numbers of Lewis and Brönsted acidic sites in the Na-form and the H-form of the TiONWs is different. The ratio and the nature of acidic sites can be tuned by the ion exchange process. The wire-like morphology and the tunable acidity are features of titanate nanowires that may render them a promising material in various heterogeneous catalytic applications. © 2013 Springer Science+Business Media New York.

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