Hydrogen photo-production from ethanol on TiO2: a surface science and catalysis study

A. M. Nadeem; J. M. R. Muir; G. W. N. Waterhouse; H. Idriss

doi:10.1117/12.895450

19 September 2011 Hydrogen photo-production from ethanol on TiO₂: a surface science and catalysis study

A. M. Nadeem, J. M. R. Muir, G. W. N. Waterhouse, H. Idriss

Proceedings Volume 8109, Solar Hydrogen and Nanotechnology VI; 81090K (2011) https://doi.org/10.1117/12.895450
Event: SPIE Solar Energy + Technology, 2011, San Diego, California, United States

Abstract

In this work we present an overview of the photo-reaction of ethanol over the surface of TiO2 (110) single crystal under photo-excitation and compare it to that over Au/TiO₂ nano-particle. Over rutile TiO₂(110) surface ethanol is present mainly in ethoxide (CH3CH2O(a)) form at 300K as evidenced by the presence of XPS C1s peak at 286.5 eV due to the -CH2-O(a) function; (a) for adsorbed. DFT computation of the same system indicated that the surface coverage is 50% or less in line with previous experimental results [1]. Exposing a pre-dosed surface to UV light in presence of oxygen resulted in the formation of acetaldehyde (CH₃CHO(g); (g) for gas phase) with the extent of reaction depending on the square root of the O₂ pressure in the 10^-10 - 10^-6torr range. Over the Au/TiO2 powder system we have focused the attention on the production of hydrogen as the oxidation of ethanol of ethanol to acetaldehyde has been previously studied [2]. The reaction is found to be sensitive to the polymorph nature of TiO₂ with anatase showing two orders of magnitudes higher activity than rutile. We have also addressed the TiO₂ particle size effect on the reaction and found that the TiO₂ particles, in the 150 to 10 nm range, to have the same reactivity.

Citation Download Citation

A. M. Nadeem, J. M. R. Muir, G. W. N. Waterhouse, and H. Idriss "Hydrogen photo-production from ethanol on TiO₂: a surface science and catalysis study", Proc. SPIE 8109, Solar Hydrogen and Nanotechnology VI, 81090K (19 September 2011); https://doi.org/10.1117/12.895450

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