Effects of thermal aging on the electronic and structural properties of Pt-Pd and toluene oxidation activity

Seung Ik Kim, Mintaek Im, Eunji Cho, Haneul Jang, Seo Yun Jang, Dong Woo Kim, Ki Wang Kim, Iljeong Heo, Young Jin Kim, Jin Hee Lee

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Catalytic oxidation is a feasible method for remediating volatile organic compounds (VOCs), due to its lower energy consumption and mineralization of VOCs into H2O and CO2. Noble metal-based catalysts are preferred for the catalytic oxidation of VOCs because of their superior activity, but they are usually deactivated by thermal aging which sinters the metal particles. Here, we report that Pt-Pd/Al2O3 thermally aged at 700–900 °C in air showed enhanced catalytic activity for toluene oxidation in humid conditions. There were electronic and structural changes in the thermally aged Pt-Pd/Al2O3, as confirmed by numerous analyses. Both Pt and Pd existed in a metallic rather than oxidized state without additional reduction steps. The noble metal particles were assembled to form Pt-Pd alloy, in the form of isolated Pd atoms surrounded by Pt atoms. This specific alloy structure was found to be crucial to the observed enhancement in catalytic toluene oxidation at low temperature.

Original languageEnglish
Article number157482
JournalScience of the Total Environment
Volume847
DOIs
StatePublished - 15 Nov 2022

Keywords

  • Catalytic oxidation
  • Pt-Pd alloy
  • Thermal aging
  • Toluene
  • VOCs

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