The influence of precursor on the preparation of ceo2 catalysts for the total oxidation of the volatile organic compound propane

Abstract

CeO2 catalysts were prepared by a precipitation method using either (NH4 )2 Ce(NO3 )6 or Ce(NO3 )3, as CeIV or CeIII precursors respectively. The influence of the different precursors on catalytic activity was evaluated for the total oxidation of propane with water present in the feed. The catalyst prepared using the CeIV precursor was more active for propane total oxidation. The choice of precursor influenced catalyst properties such as surface area, reducibility, morphology, and active oxygen species. The predominant factor associated with the catalytic activity was related to the formation of either CeO2 .nH2 O or Ce2 (OH)2 (CO3 )2 .H2 O precipitate species, formed prior to calcination. The formation of CeO2 .nH2 O resulted in enhanced surface area which was an important factor for controlling catalyst activity.