01371nas a2200217   4500008004100000022001400041245017200055210006900227260005700296300001400353490000800367520054200375653001100917653001700928653001300945653001700958653000800975100002600983700001801009856012601027       2014                        eng d  a1011-372X00aPt States in BaCe0.98Pt0.02O3-delta during start up and shut down operations under different conditions: stability and activity of ionic Pt in water gas shift reaction0 aPt States in BaCe098Pt002O3delta during start up and shut down o  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcDEC  a2227-22320 v1443 a<p>Stability of Pt species in doped BaCeO3 perovskites under Water gas shift reaction conditions is studied using X-ray absorption spectroscopy and in situ powder X-ray diffraction. The catalyst BaCe0.98Pt0.02O3-delta has Pt in +2 oxidation state and is found to be stable in the ionic form under reaction conditions as well as under various highly reducing shut down and start up conditions. In-situ XRD under Water Gas shift reaction conditions also reveals the Pt ions to be highly stabilized in lattice and no egress is observed.</p>10aBaCeO310aDeactivation10aplatinum10aWGS reaction10aXPS1 aRajesh, Thattarathody1 aDevi, Nandini  uhttps://library.ncl.res.in/content/pt-states-bace098pt002o3-delta-during-start-and-shut-down-operations-under-different-002066nas a2200217   4500008004100000022001400041245012400055210006900179260007300248300001200321490000800333520125700341653001801598653001601616653002901632653000801661653000801669100002601677700001801703856012701721       2014                        eng d  a1381-116900aResistance to ionic pt insertion in oxygen excess LaMnO3 perovskite lattices and its effect in water gas shift reaction0 aResistance to ionic pt insertion in oxygen excess LaMnO3 perovsk  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC  a534-5420 v3953 a<p>Pt doped and impregnated LaMnO3 perovskites are synthesized at different temperatures and Pt and Mn states are compared in an attempt to get insight into extent of lattice incorporation of Pt in perovskite. Various characterization studies indicate that oxygen excess system like LaMnO3 presents substantial resistance to B site doping with Pt. This behavior is different from other oxygen deficient perovskites like LaCoO3 and LaFeO3 in which lattice incorporation stabilizes the active species against sintering. Water gas shift reaction was used as a probe reaction to understand the effect of this difference in the activity. In case of LaMnO3, failure in lattice substitution leads to sintering and deactivation at high synthesis temperatures (&gt;= 700 degrees C) in both impregnated and doped samples. In doped samples, however, a strong interaction of Pt species with a persistent amorphous phase prevents sintering at lower synthesis temperature thereby enhancing the activity when compared to impregnated sample. The study reveals a possible mechanism in which only Pt(0) species is active with perovskite playing a minimal role in this system due to the resistance to lattice incorporation. (C) 2014 Elsevier B.V. All rights reserved.</p>10aOxygen excess10aPerovskites10aWater gas shift reaction10aXPS10aXRD1 aRajesh, Thattarathody1 aDevi, Nandini  uhttps://library.ncl.res.in/content/resistance-ionic-pt-insertion-oxygen-excess-lamno3-perovskite-lattices-and-its-effect-0