Synthesis of Na-stabilized nonporous t-ZrO2 supports and Pt/t-ZrO2 catalysts and application to water-gas-shift reaction

Hong Xie, Junling Lu, Mayank Shekhar, Jeffery W. Elam, W. Nicholas Delgass, Fabio H. Ribeiro, Eric Weitz, Kenneth R. Poeppelmeier

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Abstract

t-ZrO2, synthesized under hydrothermal treatment conditions at 150 °C for 20 h using NaOH as the mineralizer, was phase stable up to 600 °C in air. The t-ZrO2 calcined at 600 °C (denoted as Z600) were nonporous spherical nanocrystallites with an average size of ∼12 nm and a surface area of ∼55 m2/g, which exhibited hydrothermal stability in a wide range of pH environments from acidic to basic conditions at 200 °C for 20 h. Monodispersed platinum nanoparticles ∼1.5 ± 0.3 nm were obtained on the Z600 supported Pt/t-ZrO2 catalyst by the Pt atomic layer deposition (ALD) method. Na ions were found to play a crucial role in the formation of the stable t-ZrO2 by incorporating into the internal crystal structure of ZrO2 during the hydrothermal synthesis. The rate of water-gas-shift (WGS) reaction per mole of surface Pt on the Pt/Z600 catalyst was about five times higher compared to the catalysts prepared on commercial nonporous ZrO2. The incorporation of Na into the t-ZrO2 structure had a synergistic effect: stabilizing ZrO 2 in the tetragonal phase and promoting the WGS reaction.

Original languageEnglish
Pages (from-to)61-73
Number of pages13
JournalACS Catalysis
Volume3
Issue number1
DOIs
Publication statusPublished - Jan 4 2013

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Keywords

  • Hydrothermal synthesis
  • Na
  • Pt/ZrO
  • Tetragonal ZrO
  • Water-gas-shift reaction

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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