ChemInform Abstract: Oxidation of Carbon Monoxide Over Palladium on Zirconia Prepared from Amorphous Pd‐Zr Alloy. Part 2. The Nature of the Active Surface.

Abstract

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Fused Catalysts

“…Amorphous alloys of the composition PdZr 2 were activated in several procedures and compared to a Pd on ZrO 2 catalyst for the activity in CO oxidation applications [48,49]. Amorphous alloys of the composition PdZr 2 were activated in several procedures and compared to a Pd on ZrO 2 catalyst for the activity in CO oxidation applications [48,49].…”

“…Stable ZrO 2 filler Active Pd metal with sub-surface oxygen [48,49].) Figure 6 illustrates, schematically, the advantages of the metastable precursor structure for generating via a large internal oxide-metal interface a continuous supply of activated oxygen to replenish the Pd-O compound that is believed to be the active phase, and to constitute the active surface.…”

“…Figure 6 illustrates, schematically, the advantages of the metastable precursor structure for generating via a large internal oxide-metal interface a continuous supply of activated oxygen to replenish the Pd-O compound that is believed to be the active phase, and to constitute the active surface. It remains speculative as to whether the beneficial effect is really a spillover of oxygen from the oxide through the surface and/or bulk diffusion [48], or whether the structural stabilization of the known [49] oxygen storage phase in the Pd (the solid solution) by the defective zirconia matrix is the reason for the superior catalytic performance.…”

“…The detection of metastable phases by spectroscopic and local structure-sensitive methods has been described in case studies [3,48,49,57,58]. The detection of nonequilibrium mesostructures is rather difficult, and less frequently carried out due to the fact that the relevant size range is between local atomic microstructural motives and macroscopic crystal morphologies.…”

Metallic Glasses

“…By proper control of these processes, Pd/ZrO 2 catalysts with unique structural properties and high activity for CO [79][80][81][82] and CH 4 [87] oxidation can be prepared. The structural and chemical properties of as-derived catalysts were studied using various techniques, including scanning electron microscopy (SEM), differential thermal analysis (DTA), high-resolution transmission electron microscopy (HRTEM), Auger electron spectroscopy (AES), XPS, and UPS [79,80].…”