The Preparation of Copper-Manganese Catalysts Using a Sequentially Feeding Microreactor

The Cu-Mn interaction in copper-manganese composite oxide catalysts is crucial for their catalytic oxidation activity of volatile organic compounds (VOCs). In this study, highly dispersed copper-manganese coprecipitates were synthesized using a microreactor, and the effects of feeding intervals on the structure of the precipitates and catalysts were investigated by means of X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results indicate that sequential feeding can produce coprecipitates with better uniformity. An appropriate time difference between the Mn2+ and Cu2+ feeds can make the coprecipitate more uniform and enhance the Cu-Mn interactions in the catalyst. Higher ratios of both surface Mn3+/Mn4+ and Olatt/Oads are considered attributable to better catalytic performance.