Cu–Mn and Co–Mn catalysts synthesized from hydrotalcites and their use in the oxidation of VOCs

[Display omitted] ► The solids were evaluated in the total oxidation of three different VOCs. ► The structural composition play a determining role in the catalytic behavior. ► The transition metals avoid the formation of intermediaries (more selective to CO2). ► Cu or Co with Mn promotes low crystalline phases and optimizes the redox properties. Mixed oxides of the Cu/Mn/Mg/Al and Co/Mn/Mg/Al type were obtained by means of the thermal decomposition of hydrotalcites, with manganese as the main active phase and with variations in their content by means of the addition of Cu or Co (molar ratio Cu/Mn or Co/Mn between 0.05 and 0.5). The effect of a second active phase on the material was evaluated in the total oxidation of three volatile organic compounds, VOCs (toluene, ethanol and butanol). The catalysts were characterized by means of X-ray fluorescence (XRF), X-ray diffraction (XRD), temperature-programmed reduction with hydrogen (TPR-H2) and physisorption of nitrogen at 77K. All the solids were active in the oxidation reaction of the VOCs, where the scale of difficulty to oxidize the different organic compounds evaluated was: butanol