01575nas a2200157   4500008004100000022001400041245011500055210006900170260007100239300001600310490000800326520091100334100002601245700001801271856012801289       2014                        eng d  a1932-744700aRole of oxygen vacancies in water gas shift reaction: activity study on BaCe0.98-xYxPt0.02O3-delta perovskites0 aRole of oxygen vacancies in water gas shift reaction activity st  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcSEP  a20867-208740 v1183 a<p>Oxygen vacancies are suggested to play an important role in reactions like water gas shift where the redox mechanism is crucial. Pt-doped BaCeO3 perovskite, moderately active for water gas shift reaction, is selected for further understanding the role of oxygen vacancies, since perovskite lattice can tolerate and stabilize vacancies facilitating an accurate quantification. Vacancies are created in the system by systematic doping of increasing amounts of Y. Structure and activity studies reveal that the 6% Y-substituted compound which has the most symmetric B site coordination environment exhibits the highest activity. Hence, it is not the extent of vacancies but their structural characteristics which are found to be decisive. Symmetric coordination around B ions facilitates water adsorption and dissociation by lowering the energy barriers due to the creation of an isotropic environment.</p>1 aRajesh, Thattarathody1 aDevi, Nandini  uhttps://library.ncl.res.in/content/role-oxygen-vacancies-water-gas-shift-reaction-activity-study-bace098-xyxpt002o3-delta-0