Catalytic Wet-Air Oxidation of p-Cresol on Ag/Al2O3鈭抁rO2 Catalysts

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• 作者：Francisco Nu虂ñ ; ez ; Gloria Del Angel ; Francisco Tzompantzi ; Juan Navarrete
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：March 2, 2011
• 年：2011
• 卷：50
• 期：5
• 页码：2495-2500
• 全文大小：838K
• 年卷期：v.50,no.5(March 2, 2011)
• ISSN：1520-5045

文摘

Catalytic wet-air oxidation of p-cresol was carried out on Ag/Al₂O₃鈭抁rO₂ catalysts at 1, 5, 10, and 20 wt % of ZrO₂ in a reactor-type batch and 160 掳C and 15 bar of oxygen. Al₂O₃鈭抁rO₂ supports were prepared by the simultaneous hydrolysis of the boehmite and zirconium alkoxide. Ag/Al₂O₃鈭抁rO₂ catalysts prepared by deposition鈭抪recipitation showed higher surface area (202鈭?16 m²/g) and lower Lewis acids sites than the Ag/Al₂O₃ (161 m²/g) and Ag/ZrO₂ (25 m²/g) reference catalysts. FTIR-CO adsorption showed a shift to lower frequencies on Ag/Al₂O₃鈭抁rO₂ catalyst indicating electron-rich metallic particles. The p-cresol conversion, TOC abatement, and CO₂ selectivity were improved when Ag was supported on Al₂O₃鈭抁rO₂ mixed oxides. A modification of the surface properties of Ag on the Ag/Al₂O₃鈭抁rO₂ catalysts due to a metal鈭抯upport interaction leading to a faster oxidation of the adsorbed reactant species is proposed.