Abstract
TiO2 and La-doped TiO2 samples with La loading between 0.2% and 2% have been prepared, characterised, and tested in the catalytic oxidation of soot by O2. La doping prevents anatase to rutile phase transformation and crystallite size growth when heated at 800°C, as deduced from XRD, Raman spectroscopy and BET surface area measurements. The optimum La loading was found to be 0.2%. The catalytic activity of TiO2 and La-doped TiO2 samples tested mainly depends on crystallite size, the lower the size the better the activity. TiO2 phase composition is not a key factor in the catalytic oxidation of soot.
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