Role of phosphates in the promotion of silver catalysts for partial oxidation: I. Structure and properties of phosphates on the surface of polycrystalline silver

被引：0
|
作者：
A. S. Knyazev
A. I. Boronin
O. V. Vodyankina
S. V. Koshcheev
L. N. Kurina
机构：
[1] Russian Academy of Sciences,Institute of Petrochemistry, Siberian Division
[2] Russian Academy of Sciences,Boreskov Institute of Catalysis, Siberian Division
[3] Tomsk State University,undefined
来源：
Kinetics and Catalysis | 2005年 / 46卷
关键词：
Oxidation; Oxygen; Phosphate; Physical Chemistry; Heat Treatment;
D O I：
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摘要：
The chemical composition, structure, and properties of an H3PO4-promoted polycrystalline silver foil are studied by XPS. The surface of the doped sample contains oxygen in two states with binding energies of 531.1 and 533.0 eV. Heat treatment results in silver clusters distributed in the polyphosphate matrix. It follows from TDS data that the surface of the promoted catalyst contains a strongly bound oxygen species that desorbs at ~900 K. It is believed that the silver clusters stabilized by the phosphate matrix are active sites on the surface of the phosphorus-promoted catalyst.
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页码：144 / 150
页数：6
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