Surface Functionalization of Mesoporous Co3O4 and MnOx with Sodium for the Soot Oxidation Reaction
Por:
Medina, Juan C., Miguel-Lopez, Omar, Rodil, Sandra E., Zanella, Rodolfo
Publicada:
1 jun 2022
Resumen:
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 degrees 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.
Filiaciones:
Medina, Juan C.:
Univ Nacl Autonoma Mexico, Inst Ciencias Aplicadas & Tecnol, Circuito Exterior S-N,Ciudad Univ, Mexico City 04510, DF, Mexico
Miguel-Lopez, Omar:
Univ Nacl Autonoma Mexico, Inst Ciencias Aplicadas & Tecnol, Circuito Exterior S-N,Ciudad Univ, Mexico City 04510, DF, Mexico
Rodil, Sandra E.:
Univ Nacl Autonoma Mexico, Inst Invest Mat, AP 70-360, Mexico City 04510, DF, Mexico
Zanella, Rodolfo:
Univ Nacl Autonoma Mexico, Inst Ciencias Aplicadas & Tecnol, Circuito Exterior S-N,Ciudad Univ, Mexico City 04510, DF, Mexico
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