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Metal ions incorporated titania nanotubes for hydrocarbon oxidation

Published online by Cambridge University Press:  15 February 2011

Huifang Xu ,
Ganesh Vanamu ,
Ziming Nie ,
Jonathan Phillips  and
Yifeng Wang
Huifang Xu
Affiliation:
Department of Geology and Geophysics, University of Wisconsin, 1215 West Dayton Street, Madison, WI 53706
Ganesh Vanamu
Affiliation:
Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, NM 87131
Ziming Nie
Affiliation:
Department of Geology and Geophysics, University of Wisconsin, 1215 West Dayton Street, Madison, WI 53706
Jonathan Phillips
Affiliation:
Los Alamos National Laboratory, Engineering Science and Applications Division, MS C390, Los Alamos, NM 87545
Yifeng Wang
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
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Abstract

Present work shows that simple, standard methods of metal addition, without the need for ion implantation or other complex and expensive processes, can dramatically improve the performance of titania based structures compared to P25 for (i.e. hydrocarbon oxidation) photocatalytic reactions. In this work, Au and Pt were incorporated into titania nanotubes, and their photocatalytic activities were investigated in detail. The samples were analyzed using a JEOL FEG-2010F field emission gun scanning transmission electron microscopy (STEM) with attached Oxford Instruments' X-ray energy-dispersive spectroscopy (EDS) system and Gatan imaging filtering (GIF) system. Both high-resolution TEM (HRTEM) images and high angle annular dark-field (HAAD) images were recorded for the specimens. The performance of the samples was tested for the oxidation of acetaldehyde using a continuous flow reactor. The pure nanotube is more photoreactive than commercial P25 titania. Both Au and Pt treated nanotube samples increased the photo reactivity. The most significant result of this work is that the activity of Pt (< 1 nm) containing nanotube is more than 10 times the rate of P25, and more than 6 times the rate of the pure nanotube. However, sizes of the Au and Pt nanoparticles on the nanotube surfaces likely affected the photo-reactivity. Large size of the Au and Pt particles decreased the photo-reactivity. Specifically, the addition of platinum without formation of obvious nanoparticles on the nanotube surfaces increased the maximum activity significantly, and increased the total yield.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 876: Symposium A – Nanoporous and Nanostructured Materials for Catalysis, Sensor and Gas Separation Applications , 2005 , R9.7/P6.7
Copyright
Copyright © Materials Research Society 2005

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