The Preparation\nof Copper–Manganese Catalysts\nUsing a Sequentially Feeding Microreactor

The Cu–Mn interaction in copper–manganese\ncomposite\noxide catalysts is crucial for their catalytic oxidation activity\nof volatile organic compounds (VOCs). In this study, highly dispersed\ncopper–manganese coprecipitates were synthesized using a microreactor,\nand the effects of feeding intervals on the structure of the precipitates\nand catalysts were investigated by means of X-ray diffraction (XRD),\nRaman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The\nresults indicate that sequential feeding can produce coprecipitates\nwith better uniformity. An appropriate time difference between the\nMn<sup>2+</sup> and Cu<sup>2+</sup> feeds can make the coprecipitate\nmore uniform and enhance the Cu–Mn interactions in the catalyst.\nHigher ratios of both surface Mn<sup>3+</sup>/Mn<sup>4+</sup> and\nO<sub>latt</sub>/O<sub>ads</sub> are considered attributable to better\ncatalytic performance.