TY - JOUR
T1 - Highly and stably dispersed Pt catalysts supported over La 1-xSrxAlO3-0.5x perovskite for oxidative methane activation and their structures
AU - Mukai, Daiki
AU - Izutsu, Yoshiyuki
AU - Sekine, Yasushi
PY - 2013/5/10
Y1 - 2013/5/10
N2 - Catalytic activity for oxidative methane conversion (partial oxidation of methane) over Pt catalyst supported on La1-xSrxAlO 3-0.5x was investigated. Pt/La0.7Sr0.3AlO 2.85 showed higher and more stable hydrogen yield than Pt/α-Al2O3 did. Pt/La0.7Sr 0.3AlO2.85 showed higher catalytic activity for steam reform of methane even in an oxidative atmosphere, which was attributable to high Pt dispersion in the oxidative reaction atmosphere. Pt dispersion over La0.8Sr0.2AlO2.9 or La0.7Sr 0.3AlO2.85 increased concomitantly with increasing calcination temperature in air. This phenomenon was not observed by aging in He flow. From structural analyses using XRD, XPS, EXAFS, and XANES, the interaction or coordination between Pt and surface oxygen (Os) was observed. This coordination was weakened in a reductive atmosphere and regenerated in an oxidative atmosphere. This interaction or coordination between the Pt and La1-xSrxAlO3-0.5x contributed to high Pt dispersion in an oxidative atmosphere and to high catalytic activity for the partial oxidation of methane.
AB - Catalytic activity for oxidative methane conversion (partial oxidation of methane) over Pt catalyst supported on La1-xSrxAlO 3-0.5x was investigated. Pt/La0.7Sr0.3AlO 2.85 showed higher and more stable hydrogen yield than Pt/α-Al2O3 did. Pt/La0.7Sr 0.3AlO2.85 showed higher catalytic activity for steam reform of methane even in an oxidative atmosphere, which was attributable to high Pt dispersion in the oxidative reaction atmosphere. Pt dispersion over La0.8Sr0.2AlO2.9 or La0.7Sr 0.3AlO2.85 increased concomitantly with increasing calcination temperature in air. This phenomenon was not observed by aging in He flow. From structural analyses using XRD, XPS, EXAFS, and XANES, the interaction or coordination between Pt and surface oxygen (Os) was observed. This coordination was weakened in a reductive atmosphere and regenerated in an oxidative atmosphere. This interaction or coordination between the Pt and La1-xSrxAlO3-0.5x contributed to high Pt dispersion in an oxidative atmosphere and to high catalytic activity for the partial oxidation of methane.
KW - High dispersion
KW - Lattice oxygen
KW - Oxidative atmosphere
KW - Partial oxidation of methane
KW - Perovskite support
KW - Pt catalyst
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U2 - 10.1016/j.apcata.2013.03.017
DO - 10.1016/j.apcata.2013.03.017
M3 - Article
AN - SCOPUS:84877027297
SN - 0926-860X
VL - 458
SP - 71
EP - 81
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -