Regenerability of complex (PdO)xPd0.05-xCe0.95O2-y catalyst stabilized on functionalized alumina surface

The catalyst comprising Pd0.05-xCe0.95O2-y nanoparticles (2-5 nm) and larger PdO particles stabilized on the functionalized alumina support, active in the propane oxidation reaction, was prepared and characterized in detail. The catalyst showed high structural stability in the reducing and oxidizing environment and high reducibility of ceria in the low-temperature range (<= 400 degrees C the content of Ce3+ in reference to the total content of Ce obtained by H-2-TPR method was similar to 50 %). As a result, the catalytic activity in the propane oxidation reaction was very high (T50 % = 295 degrees C for oxidized and 264 degrees C for the reduced catalyst). The reaction parameters obtained for the activated catalyst were: turnover frequency TOF300 degrees C= 2.2.10(3) s(-1) and specific reaction rate r(300 degrees C) = 0.64 mu mol.g(-1).s(-1)). What is very important, the catalyst can be easily regenerated after the catalytic reaction by the reduction in hydrogen, because the shape and sizes of the active nanoparticles were very stable in the reaction environment.

Automated summary

The catalyst consisting of Pd0.05-xCe0.95O2-y nanoparticles and PdO particles showed high catalytic activity and structural stability in the propane oxidation reaction. The catalyst exhibited high reducibility of ceria at low temperatures and could be easily regenerated after catalytic reaction.