An FFIR study of the dispersed Ni species on Ni-YSZ catalysts

作者：Resini Carlo; Venkov Tzvetomir; Hadjiivanov Konstantin; Presto Sabrina; Riani Paola; Marazza Rinaldo; Ramis Gianguido; Busca Guido^*

来源：Applied Catalysis A: General , 2009, 353(1): 137-143.

DOI：10.1016/j.apcata.2008.10.042

• Ni catalysts
• Zirconia support
• Yttria-stabilized zirconia
• IR spectroscopy
• CO adsorption
• NO adsorption
• Ethanol steam reforming
• Steam reforming
• Reduction
• Reducibility

IR spectroscopy of low temperature adsorbed CO and CO + NO has been used to characterize the Surface species on a 5% Ni-YSZ catalyst. Dispersed surface Ni species are present on the fresh catalyst, essentially formed by Ni(2+), although it is evident that these species are very easily reduced in very mild conditions to zerovalent atomic nickel. Reduction in stronger conditions gives rise to small Ni metal particles, which are however easily reoxidized to bivalent nickel. This work has demonstrated how elastic is the redox state of this catalyst. This is supposed to be a key properties explaining the behaviour of this catalyst in converting ethanol in the presence of water.

• 出版日期2009-1-31