Water-gas shift: Characterization and testing of nanoscale YSZ supported Pt catalysts
作者： Michela Martinelli , Gary Jacobs , Uschi M. Graham , Wilson D. Shafer , Donald C. Cronauer
DOI: 10.1016/J.APCATA.2014.12.055
关键词:
摘要: Abstract Nano-scale Y-doped zirconium oxide materials were prepared with high surface areas (150–200 m 2 /g) and small nano-crystallites ( exhibited the tetragonal phase, while Zr 0.5 Y O 1.75 support displayed cubic phase. A comparison undoped zirconia suggests that 0.9 0.1 1.95 was in structure. slight increase d-spacing observed HR-TEM for relative to ZrO , along a shift lower θ XRD, provide evidence Y-doping caused macrostrain. STEM imaging confirmed Pt clusters ranged from 2 nm over all three supports. Catalyst reducibility explored by H -TPR, XANES at K-edge, TPR–XANES L III edge. higher concentration of defects 0.5%Pt/Zr catalyst 0.5%Pt/ZrO DRIFTS adsorbed CO, greater mobility formate suggested based on forward decomposition experiments steam. The promoted catalysts water-gas-shift activity when content or below 50%, best being .
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