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Silver nanoparticles supported on zirconia-ceria for the catalytic wet air oxidation of methyl tert-butyl ether

Guerra-Que, Z ; Torres-Torres, G ; Pérez-Vidal, H ; Cuauhtémoc-López, I ; Espinosa de los Monteros, A ; Beltramini, Jorge N ; Frías-Márquez, D. M

RSC advances, 2017-01, Vol.7 (6), p.3599-361 [Periódico revisado por pares]

Cambridge: Royal Society of Chemistry

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  • Título:
    Silver nanoparticles supported on zirconia-ceria for the catalytic wet air oxidation of methyl tert-butyl ether
  • Autor: Guerra-Que, Z ; Torres-Torres, G ; Pérez-Vidal, H ; Cuauhtémoc-López, I ; Espinosa de los Monteros, A ; Beltramini, Jorge N ; Frías-Márquez, D. M
  • Assuntos: Catalysis ; Catalysts ; Catalytic oxidation ; Cerium oxides ; Chemical synthesis ; Crystallites ; Diffraction patterns ; Dispersion ; Electron density ; Nanoparticles ; Oxidation ; Reduction ; Silver ; Solid solutions ; Test procedures ; X-ray diffraction ; Zirconium dioxide
  • É parte de: RSC advances, 2017-01, Vol.7 (6), p.3599-361
  • Descrição: In this work Ag nanoparticles supported on ZrO 2 -CeO 2 promoted with different amounts of CeO 2 (0, 0.5, 1, 5, 10, 15 and 20 wt%) were synthesized by deposition-precipitation method in order to test the Catalytic Wet Air Oxidation (CWAO) of Methyl Tert -Butyl Ether (MTBE). X-ray diffraction patterns reveal that the tetragonal ZrO 2 phase (t-ZrO 2 ) present in the catalysts is stabilized by the presence of CeO 2 , forming a solid solution, and preventing transformation to the monoclinic phase (m-ZrO 2 ). The t-ZrO 2 stability and the dispersion of Ag on ZrO 2 increase with CeO 2 concentration. HRTEM images confirmed that the mean crystallite size of supports and monometallic Ag catalyst decreases by CeO 2 addition. CeO 2 can also improve the reduction of Ag 2 O and increase also the d-electron density of the surface silver atoms. Furthermore, CeO 2 has a promoting effect on silver supported zirconia-ceria because of the strong metal-support interaction and its relationship of oxygen vacancies of zirconia-ceria support. The extent of reduction of silver controls the quantity of oxygen to be adsorbed during the catalytic oxidation reaction. In general, a small crystal size and high metallic dispersion can enhance the activity of MTBE catalytic wet air oxidation. The Ag/ZrO 2 -(15%)CeO 2 catalyst was the most active with 90% MTBE conversion. In this work Ag nanoparticles supported on ZrO 2 -CeO 2 promoted with different amounts of CeO 2 were synthesized by deposition-precipitation method in order to test the Catalytic Wet Air Oxidation (CWAO) of Methyl Tert -Butyl Ether (MTBE).
  • Editor: Cambridge: Royal Society of Chemistry
  • Idioma: Inglês
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