The influence of the metal-support interaction on the catalytic activity of Pt/Al2O3 and Pt/TiO2 in NH3 oxidation

D. A. Svintsitskiy, L. S. Kibis, A. I. Stadnichenko, E. M. Slavinskaya, A. S. Zaguzin, A. V. Romanenko, E. A. Derevyannikova, O. A. Stonkus, A. I. Boronin

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

5 Citations (Scopus)

Abstract

In the current work the activity of Pt/Al2O3 and Pt/TiO2 catalysts in the reaction of NH3 oxidation was studied depending on the calcination temperature. A combination of XRD, TEM, XPS and TPR methods was applied in order to analyze the influence of the interaction between active component and support on the catalytic properties of the samples. Catalysts were prepared by incipient wetness impregnation using the Pt(NO3)4 solution with calcination at 400, 600 and 800°C. A highly dispersed Pt0 particles with the average particles size ∼1nm were observed after calcination at 400°C for both Pt/Al2O3 and Pt/TiO2 samples. However, Pt/TiO2 catalyst showed better catalytic characteristics at the low-temperature range with the temperature of 50% NH3 conversion (T50) about 175°C. The calcination of the Pt/Al2O3 catalyst at T>400°C improved the low-temperature activity due to the formation of large Pt0 particles. The T50 value did not vary significantly for Pt/TiO2 samples calcined at different temperatures. Based on XPS, XRD and TPR-H2 data the strong metal-support interaction (SMSI) was shown for Pt/TiO2 catalysts. SMSI resulted in the stabilization of platinum in a highly dispersed state even after high temperature calcination. Pt/Al2O3 sample calcined at 800°C had the highest specific catalytic rate of NH3 oxidation. The high activity of the catalyst is likely due to the presence of Pt0 particles with optimal size distribution.

Original languageEnglish
Title of host publication21ST CENTURY: CHEMISTRY TO LIFE
Subtitle of host publicationChemistry to Life
EditorsAleksandr V. Lavrenov
PublisherAmerican Institute of Physics Inc.
Number of pages5
ISBN (Electronic)9780735418882
DOIs
Publication statusPublished - 16 Aug 2019
Event21st Century: Chemistry to Life - Omsk, Russian Federation
Duration: 24 Apr 201926 Apr 2019

Publication series

NameAIP Conference Proceedings
Volume2143
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference21st Century: Chemistry to Life
CountryRussian Federation
CityOmsk
Period24.04.201926.04.2019

Keywords

  • CO OXIDATION
  • PLATINUM NANOPARTICLES
  • TEMPERATURE OXIDATION
  • CLUSTERS
  • SURFACES
  • SILVER

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