Publication
Article Metrics
Citations
Online attention
Ammonia oxidation over a Pt25Rh75(001) model catalyst surface: an operando study
Authors:
Andrea
Resta
(Synchrotron SOLEIL)
,
Uta
Hejral
(Lund University)
,
Sara
Blomberg
(Lund University)
,
Stefano
Albertin
(Lund University)
,
Alina
Vlad
(Synchrotron SOLEIL)
,
Yves
Garreau
(Universite de Paris)
,
Corentin
Chatelier
(Synchrotron SOLEIL; Universite de Lorraine, CNRS)
,
Federica
Venturini
(Diamond Light Source)
,
Pilar
Ferrer
(Diamond Light Source)
,
Georg
Held
(Diamond Light Source)
,
Dave
Grinter
(Diamond Light Source)
,
Edvin
Lundgren
(Lund University)
,
Alessandro
Coati
(Synchrotron SOLEIL)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
The Journal Of Physical Chemistry C
State:
Published (Approved)
Published:
September 2020
Diamond Proposal Number(s):
21936
Abstract: The reaction of ammonia oxidation over PtRh binary alloy has been studied with a surface science approach by operando techniques such as Near Ambient Pressure X-Ray Photoemission Spectroscopy (NAP-XPS) and Surface X-Ray Diffraction (SXRD) combined with mass spectrometry. The article will explore the surface evolution across five different oxygen to ammonia ratios in the millibar regime for two different temperatures. The presented data-set allows to link variations in the atomic structures measured by diffraction methods and surface species information from NAP-XPS to reaction products in the gas phase. We will show that NO production coincides with significant changes of the surface structure and the formation of a RhO2 surface oxide. It was also observed that the RhO2 surface oxide only fully forms when the nitrogen signal in the N1s has disappeared.
Subject Areas:
Chemistry
Instruments:
B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS