Role of Pt atoms on Pd(1 1 1) surface in the direct synthesis of hydrogen peroxide: Nano-catalytic experiments and DFT calculations

Suyeon Quon, Deok Yeon Jo, Geun Ho Han, Sang Soo Han, Myung gi Seo, Kwan Young Lee

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Pd-Pt bimetallic catalysts have been studied for improvement of H2O2 selectivity in direct synthesis of H2O2; however, the role of Pt on the Pd surface has not been clearly identified. Herein, we investigated the role of Pt atoms on Pd(1 1 1) facets by realizing the surface in two different ways: nano-synthesis and density functional theory (DFT) calculation model. Pd(1 1 1) were modified into 3 kinds of Pd-Pt-alloyed surfaces, a minor Pt-substituted Pd, a major Pt-substituted Pd and a Pt-shell, covering bulk Pd. We successfully embedded Pt atoms in the octahedral Pd surface. Reaction tests showed that the minor Pt-substituted octahedral Pd catalyst had the highest H2O2 selectivity, production rate and the lowest H2O2 decomposition rate. The experimental results were consistent with our DFT calculations which predicted the lowest activation barrier for the O2 hydrogenation step and the highest one for the H2O2 dissociation step on the minor Pt-substituted Pd surface.

Original languageEnglish
Pages (from-to)237-247
Number of pages11
JournalJournal of Catalysis
Volume368
DOIs
Publication statusPublished - 2018 Dec 1

    Fingerprint

Keywords

  • Bimetallic catalyst
  • Density functional theory
  • Hydrogen peroxide
  • Morphology-controlled nanoparticle
  • Nano-catalyst
  • Palladium
  • Platinum

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

Cite this