Novel [Ce1−xLaxO2, La2−yCeyO3]/Bi2Mo0.9W0.1O6catalysts for CO oxidation at low temperature

Abstract

Novel Ce_1−xLa_xO₂ and La_2−yCe_yO₃ solid solutions supported on Bi₂Mo_0.9W_0.1O₆ were prepared by the citric acid route and tested for CO oxidation at low temperature. The main purpose was to investigate whether those mixed oxide systems could exhibit high efficiency for an oxidation process. The structure, morphology and surface area were determined by means of XRD, SEM and BET methods; also the catalytic efficiency of samples was evaluated for CO oxidation as a function of doping content. It was found that high cerium or lanthanum contents (>0.9) in mixed oxides favour higher CO conversion and lower activation temperature than that shown either by CeO₂ or Bi₂Mo_0.9W_0.1O₆ systems, separately.