A new Pd/Al2O3-La2O3 catalyst has been synthesized for the reduction of NO
with hydrogen. This catalyst is more active than coprecipitated Pd/Al2O3 ca
talysts. The revealed effect of the improvement of the catalytic activity a
t medium temperature and the increase of NH3 formation at high temperatures
for Pd catalyst supported on alumina-lanthana prepared by the sol-gel meth
od are ascribed to a new lanthanum-containing phase observed by X-ray powde
r diffraction and high resolution electron microscopy. (C)2000 Elsevier Sci
ence B.V. All rights reserved.