Real time indirect nanoplasmonic in situ spectroscopy of catalyst nanoparticle sintering
Artikel i vetenskaplig tidskrift, 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
Författare
Elin Maria Kristina Larsson
Chalmers, Teknisk fysik, Kemisk fysik
Kompetenscentrum katalys
Julien Millet
Chalmers, Teknisk fysik, Kemisk fysik
Stefan Gustafsson
Chalmers, Teknisk fysik, Eva Olsson Group
SuMo Biomaterials
Chalmers, Teknisk fysik, Mikroskopi och mikroanalys
Magnus Skoglundh
Chalmers, Kemi- och bioteknik, Teknisk ytkemi
Kompetenscentrum katalys
Vladimir Zhdanov
Chalmers, Teknisk fysik, Kemisk fysik
Kompetenscentrum katalys
Christoph Langhammer
Chalmers, Teknisk fysik, Kemisk fysik
ACS Catalysis
21555435 (eISSN)
Vol. 2 2 238-245Drivkrafter
Hållbar utveckling
Styrkeområden
Nanovetenskap och nanoteknik
Transport
Energi
Materialvetenskap
Ämneskategorier
Kemiteknik
Atom- och molekylfysik och optik
Den kondenserade materiens fysik
DOI
10.1021/cs200583u