Double perovskite Pr2−xBixSr2O6 (x = 0.533) in ketonization of 1-butanol: Effect of water vapor addition Original Research Article

An effective ketonization of 1-butanol mixed with water vapor over the catalyst Pr1.467Bi0.533Sr2O5.928 of monoclinically distorted perovskite structure is reported. The catalyst is characteristic of 1.2 at.% of oxygen vacancies, supposed to act as active centers of Lewis type, and of a high oxidative ability reflected by large change in the catalystʹs effective valence factor (V-3). The ketonization performed without water addition is accompanied with total carbonization of 1-butanol, caused by the catalystʹs oxygen, the latter easily releasable beginning from low temperatures. This negative effect is practically removable if the process is performed under the presence of water vapor. It is also found that water addition influences the formation of C3H7–CHdouble bond; length as m-dashO aldehyde and of C3H7–CO–C3H7 ketone. Nevertheless, water addition leads to a steady destruction of the catalystʹs crystal structure because of CO2, appearing in course of the WGSR process, and of its subsequent reaction with the structure component SrO to SrCO3. The catalyst is found easily reproducible by its re-oxidation in air at 850–900 °C.