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<p>The dispersion of Sr and K supported on limestone-eggshell-based CaO support and its effect in the canola oil transesterification were studied in this work by changing the Sr/(Sr + K) molar ratios in 0.2, 0.3, and 0.4, keeping the K loading in 9 wt%. K and Sr were impregnated with methanol at 60&#xa0;°C to the 50% limestone-eggshell CaO support and calcined at 800&#xa0;°C. The characterization techniques used were TGA, XRD, SEM, XPS, and Hammet indicators. It was found that the interaction between K and Sr and its dispersion depends on the concentration of Sr. At Sr/(Sr + K) = 0.2, most of the Sr is introduced into the support, whereas the K remains on the surface. At Sr/(Sr + K) = 0.3, K and Sr interactions increased, and more Sr stayed on the surface as K<sub>2</sub>Sr(CO<sub>3</sub>)<sub>2</sub>. However, as more Sr is added, Sr/(Sr + K) = 0.4, it also provokes K to enter the support. However, the number of active sites remained similar as agglomerates of this phase would form. Changing the reaction time, temperature, and MetOH/oil resulted in a 91% biodiesel yield at 90&#xa0;min, 60&#xa0;°C, and a MetOH/oil = 10. The chosen catalyst showed low stability since it was only active for two cycles.</p>

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Dispersion of Sr and K Species Supported on CaO Eggshell-Based Catalysts for Biodiesel Production

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • E. Olvera-Ureña,
  • J. A. Rodriguez,
  • J. N. Díaz de León,
  • J. A. Tavizón-Pozos

摘要

The dispersion of Sr and K supported on limestone-eggshell-based CaO support and its effect in the canola oil transesterification were studied in this work by changing the Sr/(Sr + K) molar ratios in 0.2, 0.3, and 0.4, keeping the K loading in 9 wt%. K and Sr were impregnated with methanol at 60 °C to the 50% limestone-eggshell CaO support and calcined at 800 °C. The characterization techniques used were TGA, XRD, SEM, XPS, and Hammet indicators. It was found that the interaction between K and Sr and its dispersion depends on the concentration of Sr. At Sr/(Sr + K) = 0.2, most of the Sr is introduced into the support, whereas the K remains on the surface. At Sr/(Sr + K) = 0.3, K and Sr interactions increased, and more Sr stayed on the surface as K2Sr(CO3)2. However, as more Sr is added, Sr/(Sr + K) = 0.4, it also provokes K to enter the support. However, the number of active sites remained similar as agglomerates of this phase would form. Changing the reaction time, temperature, and MetOH/oil resulted in a 91% biodiesel yield at 90 min, 60 °C, and a MetOH/oil = 10. The chosen catalyst showed low stability since it was only active for two cycles.