Preparation of Copper-Manganese Catalysts Based on High-Gravity Technology and Its Catalytic Combustion Performance of Toluene

Volatile organic compounds such as toluene are very harmful to human health and the ecological environment. Catalytic combustion technology is an effective method to remove volatile organic compounds in the atmosphere. In order to improve the problem of Cu-Mn element distribution in traditional co-precipitation preparation of copper-manganese catalysts used in catalytic combustion technology, an impinging flow-rotating packed bed combined with liquid phase co-precipitation method was proposed to prepare copper-manganese catalyst. The effects of initial impact velocity and hypergravity factor on the catalytic performance of Cu-Mn catalyst for toluene combustion were studied; under suitable preparation conditions, the physical and chemical properties of the catalyst were analyzed by Laman and H₂-TPR. The results show that the suitable process parameters are initial impact velocity 5.31 m/s and supergravity factor 105.81. The catalyst prepared under this condition exhibits good catalytic combustion activity(t₉₀=215 ℃), which is 12 ℃ lower than that of the copper-manganese composite catalyst prepared in a traditional stirred tank. The results of Laman and H₂-TPR show that the strong mass transfer and liquid-liquid micro-mixing ability of impinging flow-rotating packed bed makes the catalyst have more uniform Cu-Mn element distribution and stronger Cu-Mn synergy. After 40 h stability test, the catalyst prepared under suitable IS-RPB operating parameters still showed high catalytic combustion performance of toluene.