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.
plasmon resonance
Ostwald ripening
platinum
catalyst sintering
sintering kinetics
in situ spectroscopy
indirect nanoplasmonic sensing
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, Eva Olsson Group
SuMo Biomaterials
Chalmers, Applied Physics, Microscopy and Microanalysis
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
21555435 (eISSN)
Vol. 2 2 238-245Driving Forces
Sustainable development
Areas of Advance
Nanoscience and Nanotechnology
Transport
Energy
Materials Science
Subject Categories
Chemical Engineering
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1021/cs200583u