Effects of inorganic cocatalysts and initial states of Pd on the oxidative carbonylation of phenols over heterogeneous Pd/C
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- Title
- Effects of inorganic cocatalysts and initial states of Pd on the oxidative carbonylation of phenols over heterogeneous Pd/C
- Other Titles
- Effects of inorganic cocatalysts and initial states of Pd on the oxidative carbonylation of phenols over heterogeneous Pd/C
- Author
- Kim, Won Bae; Park, Eun Duck; Lee, Jae Sung
- Keywords
- oxidative carbonylation; bisphenol-A; phenol; Pd/C; cuprous oxide; inorganic cocatalysts; XANES; EXAFS; PdK-edge
- Issue Date
- 2003-03
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- APPLIED CATALYSIS A-GENERAL, v.242, no.2, pp.335 - 345
- Abstract
- Effects of various metal complexes of Ce, Co, Mn, and Cu compounds and of initial states of Pd with different particle sizes were investigated on coupled oxidative carbonylations of bisphenol-A (BPA) and phenol over activated carbon-supported metallic palladium (Pd/C). In the presence of Ce(CH3COO)(3) as the cocatalyst, homogeneous Pd(CH3COO)(2) showed a better activity than Pd/C as the main catalyst. From screening of the various inorganic cocatalysts, Cu2O was chosen as the best partner with the activated carbon-supported metallic palladium. More interestingly, this heterogeneous Pd/C-Cu2O catalyst system was superior to the homogeneous catalyst systems such as Pd(CH3COO)(2)-Ce(CH3COO)(3) or Pd(CH3COO)(2)-Cu2O because it provided increased conversions of bisphenol-A and selectivities to desired para-position carbonylated products. The active phase of palladium in this catalyst system appeared to be metallic Pd, as evidenced by a stronger metallic character of palladium observed after the reaction with X-ray absorption of near edge structure (XANES) of Pd K-edge. In the presence of Pd/C, the nature of metal and ligand of the inorganic cocatalyst significantly affected the catalytic activity and selectivity. However, the initial state of supported Pd showed a negligible effect, even though the metallic character of Pd varied drastically due to increasing Pd loadings or reduction temperatures. (C) 2002 Elsevier Science B.V All rights reserved
- URI
- ; Go to Link
- DOI
- 10.1016/S0926-860X(02)00545-8
- ISSN
- 0926-860X
- Appears in Collections:
- ECHE_Journal Papers
- Files in This Item:
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