id:"swepub:oai:research.chalmers.se:bce497ae-03ab-4aa0-b382-13e3c6fc529e"
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- Benavidez, A. D.University of New Mexico (författare)
Environmental Transmission Electron Microscopy Study of the Origins of Anomalous Particle Size Distributions in Supported Metal Catalysts
- Artikel/kapitelEngelska2012
Förlag, utgivningsår, omfång ...
- 2012-10-03
- American Chemical Society (ACS),2012
Nummerbeteckningar
- LIBRIS-ID:oai:research.chalmers.se:bce497ae-03ab-4aa0-b382-13e3c6fc529e
- https://doi.org/10.1021/cs3005117DOI
- https://research.chalmers.se/publication/167981URI
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- Språk:engelska
- Sammanfattning på:engelska
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- SwePubSwePub
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Anmärkningar
- In this Environmental Transmission Electron Microscopy (ETEM) study we examined the growth patterns' of uniform distributions of nanoparticles (NPs) using model catalysts. Pt/SiO2 was heated at 550 degrees C in 560 Pa of O-2 while Pd/carbon was heated in vacuum at 500 degrees C and in 300 Pa of 5%H-2 in Argon at temperatures up to 600 degrees C. Individual NPs of Pd were tracked to determine the operative sintering mechanisms. We found anomalous growth Of NPs occurred during the early stages of catalyst sintering wherein some particles started to grow significantly larger than the mean, resulting in a broadening of the particle size distribution (PSD). The abundance of the larger particles did not fit the log normal distribution. We can rule out sample nonuniformity as a cause for the growth of these large particles, since images were recorded prior to heat treatments. The anomalous growth of these particles may help explain PSDs in heterogeneous catalysts which often show particles that are significantly larger than the mean, resulting in a long tail to the right. It has been suggested previously that particle migration and coalescence could be the likely cause for such broad size distributions. We did not detect any random migration of the NPs leading to coalescence. A directed migration process was seen to occur at elevated temperatures for Pd/carbon under H-2. This study shows that anomalous growth of NPs can occur under conditions where Ostwald ripening is the primary sintering mechanism.
Ämnesord och genrebeteckningar
- NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
- NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
- environmental
- behavior
- Pd/carbon
- Pt/SiO2
- surface
- Ostwald ripening particle size distributions
- coalescence
- growth
- nanoparticles
- catalyst sintering
- islands
- heterogeneous catalysts
Biuppslag (personer, institutioner, konferenser, titlar ...)
- Kovarik, L.Pacific Northwest National Laboratory (författare)
- Genc, A. (författare)
- Agrawal, N.Pacific Northwest National Laboratory (författare)
- Larsson, Elin Maria Kristina,1979Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)elarsson (författare)
- Hansen, T. W.Danmarks Tekniske Universitet,Technical University of Denmark (författare)
- Karim, A. M.Pacific Northwest National Laboratory (författare)
- Datye, A. K.University of New Mexico (författare)
- University of New MexicoPacific Northwest National Laboratory (creator_code:org_t)
Sammanhörande titlar
- Ingår i:ACS Catalysis: American Chemical Society (ACS)2:11, s. 2349-23562155-5435
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- Kovarik, L.
- Genc, A.
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- Hansen, T. W.
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- Karim, A. M.
- Datye, A. K.
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