Real time indirect nanoplasmonic in situ spectroscopy of catalyst nanoparticle sintering
Journal article, 2012

Catalyst deactivation by sintering significantly reduces productivity and energy efficiency of the chemical industry and the effectiveness of environmental cleanup processes. It also hampers the introduction of novel energy conversion devices such as fuel cells. The use of experimental techniques that allow the scrutiny of sintering in situ at high temperatures and pressures in reactive environments is a key to alleviate this situation. Today, such techniques are, however, lacking. Here, we demonstrate by monitoring the sintering kinetics of a Pt/SiO2 model catalyst under such conditions in real time that indirect nanoplasmonic sensing (INPS) has the potential to fill this gap. Specifically, we show an unambiguous correlation between the optical response of the INPS sensor and catalyst sintering. The obtained data are analyzed by means of a kinetic model accounting for the particle-size-dependent activation energy of the Pt detachment. Ostwald ripening is identified as the main sintering mechanism.

platinum

catalyst sintering

in situ spectroscopy

sintering kinetics

indirect nanoplasmonic sensing

Ostwald ripening

plasmon resonance

Author

Elin Maria Kristina Larsson

Chalmers, Applied Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Julien Millet

Chalmers, Applied Physics, Chemical Physics

Stefan Gustafsson

Chalmers, Applied Physics, Microscopy and Microanalysis

Chalmers, Applied Physics, Eva Olsson Group

SuMo Biomaterials

Magnus Skoglundh

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Vladimir Zhdanov

Chalmers, Applied Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Christoph Langhammer

Chalmers, Applied Physics, Chemical Physics

ACS Catalysis

2155-5435 (eISSN)

Vol. 2 2 238-245

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Chemical Engineering

Atom and Molecular Physics and Optics

Condensed Matter Physics

DOI

10.1021/cs200583u

More information

Created

10/7/2017