Catalytic Wet-Air Oxidation of p-Cresol on Ag/Al2O3−ZrO2 Catalysts
| Autor: | Francisco Nunez, Francisco Tzompantzi, Gloria Del Angel, Juan Navarrete |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Boehmite
Zirconium Chemistry General Chemical Engineering Metallurgy chemistry.chemical_element General Chemistry Industrial and Manufacturing Engineering Catalysis Metal chemistry.chemical_compound Adsorption visual_art Alkoxide visual_art.visual_art_medium Lewis acids and bases Wet oxidation Nuclear chemistry |
| Zdroj: | Industrial & Engineering Chemistry Research. 50:2495-2500 |
| ISSN: | 1520-5045 0888-5885 |
| Popis: | Catalytic wet-air oxidation of p-cresol was carried out on Ag/Al 2 O 3 ―ZrO 2 catalysts at 1, 5, 10, and 20wt%of ZrO 2 in a reactor-type batch and 160 °C and 15 bar of oxygen. Al 2 O 3 ―ZrO 2 supports were prepared by the simultaneous hydrolysis of the boehmite and zirconium alkoxide. Ag/Al 2 O 3 ―ZrO 2 catalysts prepared by deposition-precipitation showed higher surface area (202―216 m 2 /g) and lower Lewis acids sites than the Ag/Al 2 O 3 (161 m 2 /g) and Ag/ZrO 2 (25 m 2 /g) reference catalysts. FTIR-CO adsorption showed a shift to lower frequencies on Ag/Al 2 O 3 ―ZrO 2 catalyst indicating electron-rich metallic particles. The p-cresol conversion, TOC abatement, and CO 2 selectivity were improved when Ag was supported on Al 2 O 3 ―ZrO 2 mixed oxides. A modification of the surface properties of Ag on the Ag/ Al 2 O 3 ―ZrO 2 catalysts due to a metal-support interaction leading to a faster oxidation of the adsorbed reactant species is proposed. |
| Databáze: | OpenAIRE |
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