Study on the Oxygen Mobility of Solid Oxide Catalysts by Controlled Pulse Reduction Methods

A detailed study on the pulse reduction behavior of the model catalysts, Bi₃FeMo₂O1₂,Fe-Te-Sb-O and Fe₂O₃-Sb₂O₄ were carried out to investigate the mobility of lattice oxygen,with propylene as the reductant and at a temperature range of 652-749K. An efficient method was proposed to measure the diffusivity of bulk lattice oxygen of Bi₃FeMo₂O₁₂ and to give a semi-quantitative estimation of the oxygen mobility near the surface of the studied catalysts.The role of oxygen mobility in the selectivity of propylene over the catalysts was discussed.