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Issue 12, 2017
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In situ studies of NO reduction by H2 over Pt using surface X-ray diffraction and transmission electron microscopy

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Abstract

In situ surface X-ray diffraction and transmission electron microscopy at 1 bar show massive material transport of platinum during high-temperature NO reduction with H2. A Pt(110) single-crystal surface shows a wide variety of surface reconstructions and extensive faceting of the surface. Pt nanoparticles change their morphology depending on the gas composition: They are faceted in hydrogen-rich environments, but are more spherical in NO-rich environments, indicating the formation of vicinal surfaces. We conclude that high coverage of NO combined with sufficient mobility of platinum surface atoms is the driving force for the formation of steps on both flat surfaces and nanoparticles. Since the steps that are introduced provide strongly coordinating adsorption sites with potential catalytic benefits, this may be of direct practical relevance for the performance of catalytic nanoparticles under high-pressure conditions.

Graphical abstract: In situ studies of NO reduction by H2 over Pt using surface X-ray diffraction and transmission electron microscopy

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Supplementary files

Article information


Submitted
24 Nov 2016
Accepted
07 Mar 2017
First published
07 Mar 2017

This article is Open Access

Phys. Chem. Chem. Phys., 2017,19, 8485-8495
Article type
Paper

In situ studies of NO reduction by H2 over Pt using surface X-ray diffraction and transmission electron microscopy

S. B. Roobol, W. G. Onderwaater, M. A. van Spronsen, F. Carla, O. Balmes, V. Navarro, S. Vendelbo, P. J. Kooyman, C. F. Elkjær, S. Helveg, R. Felici, J. W. M. Frenken and I. M. N. Groot, Phys. Chem. Chem. Phys., 2017, 19, 8485
DOI: 10.1039/C6CP08041C

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