TY - JOUR

T1 - An XPS Study of the Interaction of Rhodium Foil with NO2

AU - Smirnov, M. Yu

AU - Kalinkin, A. V.

AU - Bukhtiyarov, V. I.

PY - 2019/11/1

Y1 - 2019/11/1

N2 - The interaction of rhodium foil with nitrogen dioxide over a temperature range of 30–450°C at three NO2 pressures of 10–6, 10–5, and 10–4 mbar was studied using X-ray photoelectron spectroscopy (XPS). At all of the three pressures, a three-dimensional surface oxide film with the Rh2O3 stoichiometry was formed on the foil surface starting from a temperature of 150°C. As the interaction temperature was increased at an NO2 pressure of 10–6 mbar, the film thickness d initially increased to reach a maximum of ~2.0 nm at 350°C and then decreased due to the decomposition of Rh2O3 to the metal. At pressures of 10–5 and 10–4 mbar, a monotonic increase in d up to 3.0 or 4.7 nm, respectively, was observed in a temperature range of 150–450°C. In the case of the interaction with the participation of molecular oxygen at a pressure of 10–4 mbar and temperatures of 30–450°C, the Rh foil surface was not oxidized. The results of the study on the interaction of NO2 with Rh were compared with the data obtained earlier for Pd and Pt under comparable conditions.

AB - The interaction of rhodium foil with nitrogen dioxide over a temperature range of 30–450°C at three NO2 pressures of 10–6, 10–5, and 10–4 mbar was studied using X-ray photoelectron spectroscopy (XPS). At all of the three pressures, a three-dimensional surface oxide film with the Rh2O3 stoichiometry was formed on the foil surface starting from a temperature of 150°C. As the interaction temperature was increased at an NO2 pressure of 10–6 mbar, the film thickness d initially increased to reach a maximum of ~2.0 nm at 350°C and then decreased due to the decomposition of Rh2O3 to the metal. At pressures of 10–5 and 10–4 mbar, a monotonic increase in d up to 3.0 or 4.7 nm, respectively, was observed in a temperature range of 150–450°C. In the case of the interaction with the participation of molecular oxygen at a pressure of 10–4 mbar and temperatures of 30–450°C, the Rh foil surface was not oxidized. The results of the study on the interaction of NO2 with Rh were compared with the data obtained earlier for Pd and Pt under comparable conditions.

KW - NO

KW - RhO

KW - rhodium

KW - X-ray photoelectron spectroscopy (XPS)

KW - SYNTHESIS GAS

KW - OXIDE

KW - PARTICLES

KW - PLATINUM

KW - DECOMPOSITION

KW - CO OXIDATION

KW - NO2

KW - Rh2O3

KW - RH

KW - SURFACE

KW - PARTIAL OXIDATION

KW - NITROGEN-DIOXIDE

UR - http://www.scopus.com/inward/record.url?scp=85079717480&partnerID=8YFLogxK

U2 - 10.1134/S0023158419060119

DO - 10.1134/S0023158419060119

M3 - Article

AN - SCOPUS:85079717480

VL - 60

SP - 823

EP - 831

JO - Kinetics and Catalysis

JF - Kinetics and Catalysis

SN - 0023-1584

IS - 6

ER -