Abstract
This paper deals with the effect of catalyst loading on the activity and selectivity of CuOx−MnOy catalysts on alumina-silicate supports (fiber material-Al2O3(44)/SiO2(56)). A special focus lies on the oxidation of CO, on mixtures of VOC from 1-butene, isobutane, n-butane, propane, ethene, and ethane, as well as on CO oxidation in the presence of NO2. The catalysts are prepared through wet impregnation of the filter section with an aqueous solution of copper and manganese nitrate. The rate of CO oxidation for small carbon monoxide concentrations of up to 1 vol.% is independent of catalyst loading in the filter material. In contrast, at a carbon monoxide concentration of around 3 vol.%, it is found that the rate of CO oxidation increased rapidly with increasing catalyst loading of the filter material. The highest catalytic activity of over 93% CO elimination is achieved at 290 °C for 1 vol.% CO and smaller catalyst loading and for 3 vol.% CO with higher catalyst loading. In long-term stability tests, complete CO conversion is measured without deactivating the catalyst at 390 °C for at least 100 h. The highest catalytic activity for VOC elimination of 90% is achieved in the temperature range of 350–420 °C. During the CONO2 reaction with and without O2, a constant decrease in the CO oxidation rate is observed, while the NO2 reduction rate remained constant at a temperature below 300 °C.
Highlights
Catalytic total oxidation is widely used in several industrial processes for air pollution abatement and in particular for controlling volatile organic compounds (VOC) and carbon monoxide emissions
The surface area of A0 catalytic filters decreased by approximately 10% after CO/VOC oxidation
The manufactured catalytic filters are characterized by a uniform distribu tion of catalyst material along with the fiber material of the support
Summary
Catalytic total oxidation is widely used in several industrial processes for air pollution abatement and in particular for controlling volatile organic compounds (VOC) and carbon monoxide emissions. Spassova et al [24] reported that interaction between Cu and MnOx with the formation of a highly disordered mixed oxide of spinel-like structure is the cause of the high catalytic activity of the CuO-MnOx catalyst. Compared to our results for CuOx− MnOy catalysts on alumina-silicate filter material, the temperature needed for complete CO conversion was 100 ◦C higher, but CO concentration was five times higher.
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