Low-temperature combustion of 2,4,6-trichlorophenol in catalytic wet oxidation with nanocasted Mn–Ce-oxide catalyst

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• 作者：M. Abecassis-Wolfovich ; M.V. L ; au ; A. Brenner ; M. Herskowitz
• 关键词：Catalytic wet oxidation ; Trichlorophenol ; Mn– ; Ce catalyst ; Nanocasting ; Mesostructured silica SBA-15
• 刊名：Journal of Catalysis
• 出版年：2007
• 出版时间：25 April 2007
• 年：2007
• 卷：247
• 期：2
• 页码：201-213
• 全文大小：1631 K

文摘

The essentially complete mineralization (>95 % total organic carbon elimination) of 2,4,6-trichlorophenol by a CWO is reported at a very mild operating conditions (120 °C, 955750769c6bfa4bf95ff46"" title=""Click to view the MathML source"">P_O2=10 bar), with the use of a nanocasted Mn–Ce-oxide catalyst. This unique catalyst was prepared by fabrication of a thin nanometric layer of Mn–Ce oxides inside the tubular mesopores of SBA-15 silica using internal gelation of corresponding metal chlorides. Crystallization of this oxide layer at 700 °C, followed by removal of silica matrix, yielded a nanostructured mixed-oxide catalyst with surface area up to 316 m²/g. It demonstrated superior textural, structural, and surface oxygen properties compared with a reference co-precipitated bulk Mn–Ce-oxide catalyst. This is a result of reduction and equalization of the crystal size of both oxide-phases Mn₂O₃ and CeO₂ at the level of 2–3 nm, providing the full availability of their surface for reacting molecules. The performance measured with the novel catalyst indicates a major improvement in the efficient application of CWO processes for complete purification of complex waste streams.