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Surface Functionalization of Mesoporous Co3O4 and MnOx with Sodium for the Soot Oxidation Reaction

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Abstract

The synthesis, characterization, and catalytic evaluation of two different mesoporous transition metal oxides (m-Co3O4 and m-MnOx) for the soot oxidation reaction are reported. The effect of sodium addition on the soot oxidation was studied, finding that the optimal sodium load for enhancing the catalytic performance of cobalt and manganese oxides was 7 wt%. Structural, morphological, and textural properties were studied and characterized by X-ray diffraction (XRD), Raman spectroscopy (RS), scanning electron microscopy (SEM), and physical nitrogen adsorption/desorption curves. Moreover, inductively coupled plasma mass spectrometry (ICP-MS) and X-ray photoelectron spectroscopy (XPS) were performed to explore the chemical species present in the materials. The results show that either the 7Na/m-Co3O4 or 7Na/m-MnOx catalyst presented remarkable enhanced activity for the soot oxidation reaction, reaching 50% of soot conversion at 278 and 285 °C, respectively. The enhanced catalytic activity of these catalysts could be explained by the addition of the alkaline metal ion, which improved the soot/catalyst contact. Furthermore, the interaction between sodium and Co or Mn promoted the production of oxygen vacancies and, consequently, the mobility of lattice oxygen. The 7Na/m-Co3O4 catalyst showed resistance to deactivation for five cycles.

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Acknowledgements

The authors want to acknowledge the financial support provided by the Consejo Nacional de Ciencia y Tecnología (CONACYT) through the A1-S-18269 and 299703 Grants and by the Dirección General de Asuntos del Personal Académico (DGAPA)-UNAM through the IN103719 Grant. We acknowledge V. Maturano, A. Tejeda, and J. Romero for their technical assistance. J. C. Medina acknowledges CONACYT for his postdoctoral scholarship.

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  1. Instituto de Ciencias Aplicadas y Tecnología, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, 04510, Mexico City, Mexico

    Juan C. Medina, Omar Miguel-Lopez & Rodolfo Zanella

  2. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, A. P. 70-360, Coyoacán, 04510, Mexico City, Mexico

    Sandra E. Rodil

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Medina, J.C., Miguel-Lopez, O., Rodil, S.E. et al. Surface Functionalization of Mesoporous Co3O4 and MnOx with Sodium for the Soot Oxidation Reaction. Top Catal 65, 766–778 (2022). https://doi.org/10.1007/s11244-022-01595-5

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