Supported PdCl2-CuCl2 catalysts for carbon monoxide oxidation .2. XAFS characterization
SCIE
SCOPUS
- Title
- Supported PdCl2-CuCl2 catalysts for carbon monoxide oxidation .2. XAFS characterization
- Authors
- Lee, JS; Choi, SH; Kim, KD; Nomura, M
- Date Issued
- 1996-01-18
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- A heterogenized Wacker catalyst system in which pores of a high surface area alumina were filled with an aqueous solution of PdCl2-CuCl2 was active for the oxidation of CO near room temperature. The structure of the catalyst was studied by X-ray absorption fine structure (XAFS). The active phase of Pd was a Pd-II species containing chlorine and, probably, carbonyl ligands. Direct interaction of Pd-Pd or Pd-Cu was not detected. The active phase of copper was found to be solid Cu2Cl(OH)(3) particles in agreement with the X-ray diffraction (XRD) results. The presence of Cu was essential to keep the Pd in the Pd-II state during the reaction. The rates of CO oxidation measured at temperatures of 30-70 degrees C showed a minimum at 40 degrees C, which was attributable partly to an unusual structure change of the active palladium species during the reaction at this temperature.
- Keywords
- carbon monoxide oxidation; PdCl2-CuCl2/alumina; XAFS; structure; X-RAY-ABSORPTION; LOW-TEMPERATURE OXIDATION; CO OXIDATION; FINE-STRUCTURE; NOBLE-METALS; PLATINUM; PD
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21623
- DOI
- 10.1016/0926-3373(95)00043-7
- ISSN
- 0926-3373
- Article Type
- Article
- Citation
- APPLIED CATALYSIS B-ENVIRONMENTAL, vol. 7, no. 3-4, page. 199 - 212, 1996-01-18
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