Direct observation of hydrogen spillover in Ni-loaded Pr-doped ceria

作者：Sharma Vaneet; Crozier Peter A^*; Sharma Renu; Adams James B

来源：Catalysis Today, 2012, 180(1): 2-8.

DOI：10.1016/j.cattod.2011.09.009

• In situ
• Pr-doped ceria
• Reduction zone
• Hydrogen-spillover
• TEM

In situ studies on reduction processes in praseodymium-doped ceria and nickel-loaded doped ceria nanoparticles have been investigated using environmental transmission electron microscopy. The presence of pit-like defects on the oxide nanoparticles resulted in amorphization during reduction. Hydrogen-spillover in nickel-loaded praseodymium-doped ceria (PDC) was directly observed. Localized reduction of ceria in a H-2 atmosphere was observed and attributed to gas-nickel-ceria interactions at the three-phase boundary. The spatial extent of the localized reduction zones was experimentally determined. The spillover mechanism is discussed in terms of surface diffusion properties of atomic hydrogen and oxygen species.

• 出版日期2012-1-17