Catalytic decomposition of ethyl acetate over La-modified Cu–Mn oxide supported on honeycomb ceramic

Abstract

The La-modified Cu–Mn spinel oxide was successfully coated onto honeycomb ceramic by a wash-coating method for complete catalytic decomposition of ethyl acetate. The La-modified Cu–Mn oxides were characterized by X-ray diffraction, X-ray fluorescence, H2-temperature programmed reduction, Brunauer-Emmett-Teller method, field-emission scanning electron microscopy and high-resolution transmission electron microscopy. The effects of different precipitants and rare earth doping on the structure and catalytic performance of the catalysts were investigated. The results show that the CuMn2O4 spinel with (NH4)2CO3 as a precipitant can form a larger specific surface area and a suitable pore size, which is beneficial to the absorption of ethyl acetate. Although the rare earth doping does not significantly change the crystal phase structure of the catalyst, it improves its reducibility and lowers the temperature of the catalytic decomposition. With respect to the catalytic decomposition of ethyl acetate, the rare earth-modified Cu–Mn oxide supported on honeycomb ceramic shows excellent catalytic performance with 100% conversion under the conditions of 239 °C, space velocity of 12500 h−1 and 1000 ppm. And the ethyl acetate removal rate is still 100% after 1440 min of continuous reaction.