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In-situ XPS and XAS Studies of a New Phenomenon of Kinetic Hysteresis in Selective Methane Oxidation over Platinum Conference attendances

Language Английский
Participant type Устный
Conference EuropaCat-XII: 12th European Congress on Catalysis “Catalysis: Balancing the use of fossil and renewable resources”
30 Aug - 4 Sep 2015 , Казань
Authors Pakharukov Ilʹya Yurʹevich 1,2 , Bukhtiyarov Valerii Ivanovich 1,2 , Chetyrin Igor Anatolʹevich 1,2 , Prosvirin Igor Petrovich 1,2 , Parmon Valentin Nikolaevich 1,2 , Murzin Vadim Yurʹevich 3 , Zubavichus Yan Vitautasovich 3
Affiliations
1 Boreskov Institute of Catalysis SB RAS
2 Novosibirsk National Research University
3 National Research Centre "Kurchatov Institute"

Abstract: Recently, we discovered a new phenomenon of kinetic hysteresis in selective methane oxidation over platinum catalysts. To establish the causes of this phenomenon, we studied changes in the oxidation state of active component in real Pt/γ-Al2O3 catalysts by in-situ X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). In-situ XPS experiments revealed the presence of kinetic hysteresis even at low pressures (~ 0.01 mbar). Analysis of the in-situ XPS spectra showed that the catalyst activation was associated with partial reduction of the supported platinum. The XAS data also implied that the activation was accompanied by predominant formation of the metallic platinum, while oxidation of the platinum surface led to deactivation.
Cite: Pakharukov I.Y. , Bukhtiyarov V.I. , Chetyrin I.A. , Prosvirin I.P. , Parmon V.N. , Murzin V.Y. , Zubavichus Y.V.
In-situ XPS and XAS Studies of a New Phenomenon of Kinetic Hysteresis in Selective Methane Oxidation over Platinum
EuropaCat-XII: 12th European Congress on Catalysis “Catalysis: Balancing the use of fossil and renewable resources” 30 Aug - 4 Sep 2015