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<p>This study investigates the catalytic performance of a series of oxide catalysts for the combustion of a model gas mixture simulating emissions from biomass combustion. Low-cost raw materials were used to prepare monometallic catalysts (1%, 3%, and 5% K/MgO) and bimetallic catalysts (1%, 3%, and 5% K/(Cu/MgO), K/(Mn/MgO), and K/(Fe/MgO)). The model gas mixture consisted of CO, CH<sub>4</sub>, C<sub>10</sub>H<sub>8</sub>, CO<sub>2</sub>, air, and N<sub>2</sub>. The catalysts were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA), nitrogen adsorption for BET surface area determination, and CO<sub>2</sub> temperature-programmed desorption (CO<sub>2</sub>-TPD). The results demonstrate that all catalysts were active for the oxidation of CH<sub>4</sub> and C<sub>10</sub>H<sub>8</sub>, which those containing 1% potassium exhibiting the highest activity and achieving complete conversion at temperatures below 600&#xa0;°C. Among the studied materials, the 1%K(5%Mn/MgO) catalyst showed the best performance, reaching 100% conversion of CH<sub>4</sub> and C<sub>10</sub>H<sub>8</sub> at approximately 400&#xa0;°C and 600&#xa0;°C. The enhanced catalytic performance, particularly for the Mn-containing catalysts, is attributed to improved surface basicity and metal-support interactions at low potassium loadings, while higher K contents promote carbonate formation and surface area reduction, leading to partial deactivation.</p>

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Catalytic oxidation of biomass combustion emissions over K-M/MgO (M = Cu, Mn, Fe) mixed oxide catalysts

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Jessica San Martín-Dávison,
  • Alberto Vergara-Fernández,
  • Sichem Guerrero,
  • Nelson Alarcón Pulido

摘要

This study investigates the catalytic performance of a series of oxide catalysts for the combustion of a model gas mixture simulating emissions from biomass combustion. Low-cost raw materials were used to prepare monometallic catalysts (1%, 3%, and 5% K/MgO) and bimetallic catalysts (1%, 3%, and 5% K/(Cu/MgO), K/(Mn/MgO), and K/(Fe/MgO)). The model gas mixture consisted of CO, CH4, C10H8, CO2, air, and N2. The catalysts were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA), nitrogen adsorption for BET surface area determination, and CO2 temperature-programmed desorption (CO2-TPD). The results demonstrate that all catalysts were active for the oxidation of CH4 and C10H8, which those containing 1% potassium exhibiting the highest activity and achieving complete conversion at temperatures below 600 °C. Among the studied materials, the 1%K(5%Mn/MgO) catalyst showed the best performance, reaching 100% conversion of CH4 and C10H8 at approximately 400 °C and 600 °C. The enhanced catalytic performance, particularly for the Mn-containing catalysts, is attributed to improved surface basicity and metal-support interactions at low potassium loadings, while higher K contents promote carbonate formation and surface area reduction, leading to partial deactivation.