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

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 catalyst's effective valence factor (V-3). The ketonization performed without water addition is accompanied with total carbonization of 1-butanol, caused by the catalyst's 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–CHO aldehyde and of C3H7–CO–C3H7 ketone. Nevertheless, water addition leads to a steady destruction of the catalyst's 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.

Graphical abstractKetonization of 1-butanol over Pr1.467Bi0.533Sr2O5.928 catalyst of monoclinically distorted perovskite structure is reported. The catalyst is characteristic of 1.2 at.% of oxygen vacancies and of a high oxidative ability reflected by large change in the catalyst's effective valence factor (V-3). The carbonization of 1-butanol, caused by the catalyst's oxygen, is practically removable under the presence of water vapor. Water addition influences the formation of C3H7–CHO aldehyde and C3H7–CO–C3H7 ketone. Nevertheless, it leads to a steady destruction of the crystal structure because of the subsequent reaction of CO2 with the structure component SrO. The catalyst is easily reproducible by re-oxidation at 850–900 °C.Figure optionsDownload full-size imageDownload as PowerPoint slide