关键词: 催化湿式氧化, 催化剂, 丙烯酸, 废水

Abstract: Cu-Zn-Ce-Al precursors with hydrotalcite-like layered structure were prepared by cocurrent coprecipitation method. After calcining at 720oC for 8 h, the precursors transformed to a series of spinel structure catalyst. The compositions of the catalysts were analyzed; reaction conditions including temperature, space velocity and oxygen partial pressure, as well as life test were investigated. Results showed that when using a catalyst having metal compositions of Cu: Zn: Ce: Al = 2:0.8:0.2:1 to treat an acrylic acid wastewater (COD concentration of 26 000 mg/L) under the conditions of a reaction temperature of 150 ℃, an oxygen partial pressure of 1.0MPa and a reaction space velocity of 1h-1, the COD removal rate reached more than 90%. After running 100 h, the Cu dissolution loss was 0.23 mg/L (less than the requirement of National Standard for Water Qualities of 0.3 mg/L), which indicated that the catalyst possessed good catalytic oxidation performance and structure stability.

Key words: catalytic wet air oxidation, catalyst, acrylic acid, wastewater