Abstract
The use of methanol as an alternative fuel for gasoline or diesel engines increases the unregulated CH3OH emission. γ-Al2O3 modified with Cu, Mn, Ce, K, Ag, Cu–Mn, Cu–Ce, Cu–Ag or Cu–K (0.5, 1.0, 0.5:0.5, 1.0:1.0 wt% of metal) catalysed the process of methanol incineration. The highest activity reached samples containing 1.0 wt% of silver. Dispersed Ag+ species on Al2O3 served as active species for selective oxidation of CH3OH to CO2 over both Ag/Al2O3 and Cu–Ag/Al2O3. Additionally, the XPS and EPR results revealed the AgO interface between the Ag2O and CuO in the Cu–Ag system.
Highlights
Volatile organic compounds (VOCs) are organic compounds with the boiling points lower than 260 °C at a standard atmospheric pressure of 101.325 kPa
Alumina modified with different metals was tested in the process of methanol incineration
We carried out a screening research of the activity of a series of catalysts—c-Al2O3 modified Cu, Mn, Ce, K, Ag, Cu–Mn, Cu–Ce, Cu–Ag, Cu–K—for the total methanol oxidation
Summary
Volatile organic compounds (VOCs) are organic compounds with the boiling points lower than 260 °C at a standard atmospheric pressure of 101.325 kPa. Silver-based catalysts have been less intensively studied for total combustion of VOCs. The studies of Cordi and Falconer [7] led to the conclusion that the Ag/Al2O3 (2.1 wt% of Ag), was very active for the complete oxidation of various VOCs. Based on the largest CO2 peak (based on TPO analysis), it was suggested, that the relative oxidation activities followed the order: formic acid [ methanol [ acetic acid [ ethanol [ acetaldehyde: The silver supported on alumina was studied for oxidation of toluene Besides silver-based catalytic systems, a lot of studies report successful application of the Cu-containing catalysts for VOCs elimination (including methanol) The solution for its escape to the atmosphere could be catalytic oxidation of unburned methanol from exhaust gases. A sieve fraction of particles with size of 0.160–0.315 mm was used
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