Tuning Pt-CeO2 interactions by high-temperature vapor-phase synthesis for improved reducibility of lattice oxygen

Abstract In this work, we compare the CO oxidation performance of Pt single atom catalysts (SACs) prepared via two methods: (1) conventional wet chemical synthesis (strong electrostatic adsorption–SEA) with calcination at 350 °C in air; and (2) high temperature vapor phase synthesis (atom trapping–AT) with calcination in air at 800 °C leading to ionic Pt being trapped on the CeO 2 in a thermally stable form. As-synthesized, both SACs are inactive for low temperature (<150 °C) CO oxidation. After treatment in CO at 275 °C, both catalysts show enhanced reactivity. Despite similar Pt metal particle size, the AT catalyst is significantly more active, with onset of CO oxidation near room temperature. A…

• UD
  U.S. Department of Energy

  Awards: DE-FG02-05ER15712, FG02-05ER15712, DE-FG02-, DE-FG02
• DA
  Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
• NO
  Nederlandse Organisatie voor Wetenschappelijk Onderzoek
• FC
  Fulbright Colombia
• OO
  Office of Science

  Awards: DE-FG02-05ER15712, FG02-05ER15712
• OO
  Office of Energy Efficiency and Renewable Energy
• BE
  Basic Energy Sciences

  Awards: DE-FG02-05ER15712, DE-FG02
• BA
  Biological and Environmental Research

  Award: DE-FG02-05ER15712
• OO
  Office of Energy Efficiency