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Nanostructured catalysts from laser pyrolysis
|Nathalie C. Herlin-Boime 1, Hicham Maskrot 1,2, Yann Leconte 1, Cecile Reynaud 1, Monique Gervais 2, Sabine Valange 3, Erwan Guelou 3, Joel Barrault 3, Jean Noel Rouzaud 4
1. CEA-Saclay, Bat 522, Gif-sur-Yvette 91191, France
Catalysis is one of the privileged applications in nanoscience because it takes advantage of the high surface/volume ratio of nanomaterials. The high dispersion of the active phase in nanomaterials leads to a better catalytic efficiency. However the synthesis of such materials by traditional methods is not straightforward and new methods, such as laser pyrolysis, are therefore under exploration.
Laser pyrolysis is a method allowing the synthesis of various nanoparticles, with well defined chemical composition, size and structure. It is based on the interaction of a powerful IR laser beam with a mixture of gaseous or liquid precursors. This interaction leads to an increase of temperature with decomposition of the precursors followed by nucleation and growth of nanoparticles in an incandescent flame.
This work reports the laser synthesis of titania based powders containing a noble metal (in particular nanoPt/TiO2) using a spray of TTIP (Titanium tetra isopropoxide) mixed with organometallic precursors. TEM pictures show that the obtained TiO2 nanoparticles can have a diameter in the range 6-7 nm. The total amount of Pt can be controlled in the range 0.5-5 wt%. The volatile organic compounds elimination tests demonstrate that these nanoparticles are efficient for the total methanol oxidation at a temperature as low as 50°C.
In conclusion, these results show that the laser pyrolysis method allows the synthesis of well dispersed titanium-based nanoparticles which act as efficient catalysts.
Presentation: Oral at E-MRS Fall Meeting 2006, Symposium B, by Nathalie C. Herlin-Boime
See On-line Journal of E-MRS Fall Meeting 2006
Submitted: 2006-05-17 21:44 Revised: 2009-06-07 00:44