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Characterization of...
Characterization of Surface Structure and Oxidation/Reduction Behaviour of Pd-Pt/Al2O3 Model Catalysts
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- Martin, Natalia Mihaela, 1984 (author)
- Chalmers University of Technology
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- Nilsson, Johan, 1987 (author)
- Chalmers University of Technology
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- Skoglundh, Magnus, 1965 (author)
- Chalmers University of Technology
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- Adams, Emma, 1989 (author)
- Chalmers University of Technology
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- Wang, Xueting, 1991 (author)
- Chalmers University of Technology
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- Velin, Peter, 1989 (author)
- Chalmers University of Technology
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- Smedler, Gudmund, 1956 (author)
- Johnson Matthey AB
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- Rai, Agnes (author)
- Johnson Matthey
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- Thompsett, David (author)
- Johnson Matthey
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- Brongersma, Hidde (author)
- Eindhoven University of Technology
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- Grehl, Thomas (author)
- ION-TOF GmbH
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- Agostini, Giovanni (author)
- European Synchrotron Radiation Facility
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- Mathon, Olivier (author)
- European Synchrotron Radiation Facility
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- Carlson, Stefan (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Norén, Katarina (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Martinez-Casado, Francisco Javier (author)
- Lund University
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- Matej, Zdenek (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Balmes, Olivier (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Carlsson, Per-Anders, 1972 (author)
- Chalmers University of Technology
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(creator_code:org_t)
- 2016-12-02
- 2016
- English.
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In: Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 120:49, s. 28009-28020
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Abstract
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- Structural and morphological characterisation of bimetallic Pd-Pt/Al2O3 model cat- alysts are performed using X-ray diffraction, X-ray absorption spectroscopy, transmis- sion electron microscopy and CO chemisorption. Further, the catalysts were studied under oxidising and reducing conditions using both X-ray absorption spectroscopy and low-energy ion scattering spectroscopy. For the as-prepared catalysts, the existence of alloyed bimetallic Pd-Pt particles and of (tetragonal) PdO were found for the samples calcined at 800 C. PdO is present in form of crystals at the surface of the Pd-Pt par- ticles or as isolated PdO crystals on the support oxide. Bimetallic Pd-Pt nanoparticles were only formed on the Pd-Pt catalysts after calcination at 800 C. The results show that the Pd-Pt nanoparticles undergo reversible changes in surface structure composi- tion and chemical state in response to oxidising or reducing conditions. Under oxidising conditions Pd segregates to the shell and oxidises forming PdO, while under reducing conditions regions with metallic Pd and Pd-Pt alloys were observed at the surface. No bimetallic Pd-Pt nanoparticles were observed for the sample initially calcined at 500 C, but instead isolated monometallic particles, where small Pt particles are easily oxidised under O2 treatment. In the monometallic catalysts, the Pd is found to be com- pletely oxidised already after calcination and to consist of metallic Pd after reductive treatment.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Kemiska processer (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- art (subject category)
- ref (subject category)
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Martin, Natalia ...
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Nilsson, Johan, ...
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Skoglundh, Magnu ...
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Adams, Emma, 198 ...
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Wang, Xueting, 1 ...
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Velin, Peter, 19 ...
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Smedler, Gudmund ...
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Rai, Agnes
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Thompsett, David
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Brongersma, Hidd ...
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Grehl, Thomas
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Agostini, Giovan ...
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Mathon, Olivier
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Carlson, Stefan
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Norén, Katarina
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Martinez-Casado, ...
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Matej, Zdenek
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Balmes, Olivier
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Carlsson, Per-An ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Physical Chemist ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Chemical Enginee ...
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and Chemical Process ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Journal of Physi ...
- By the university
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Chalmers University of Technology
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Lund University
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Uppsala University