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Accelerated deactiv...
Accelerated deactivation studies of the natural-gas oxidation catalyst-Verifying the role of sulfur and elevated temperature in catalyst aging
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- Honkanen, M. (författare)
- Tammerfors tekniska universitet,Tampere University of Technology
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- Karkkainen, M. (författare)
- Oulun Yliopisto,University of Oulu
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- Kolli, T. (författare)
- Oulun Yliopisto,University of Oulu
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- Heikkinen, O. (författare)
- Aalto-Yliopisto,Aalto University
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- Viitanen, V. (författare)
- Aalto-Yliopisto,Aalto University
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- Zeng, Lunjie, 1983 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Jiang, H. (författare)
- Aalto-Yliopisto,Aalto University
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Kallinen, Kauko (författare)
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- Huuhtanen, M. (författare)
- Oulun Yliopisto,University of Oulu
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- Keiski, R. L. (författare)
- Oulun Yliopisto,University of Oulu
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- Lahtinen, J. (författare)
- Aalto-Yliopisto,Aalto University
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- Olsson, Eva, 1960 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Vippola, M. (författare)
- Tammerfors tekniska universitet,Tampere University of Technology
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(creator_code:org_t)
- Elsevier BV, 2016
- 2016
- Engelska.
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Ingår i: Applied Catalysis B: Environmental. - : Elsevier BV. - 0926-3373 .- 1873-3883. ; 182, s. 439-448
- Relaterad länk:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- Accelerated deactivation, caused by thermal aging (TA) and/or sulfur + water poisoning (SW), of the PtPd/gamma-Al2O3 natural-gas oxidation catalyst was studied. Thermal aging and poisoning treatments were performed separately and with varied combinations and comprehensive characterization of the catalyst was carried out after each step. The fresh catalyst has small, oxidized PtPd particles (<5 nm) uniformly distributed in the gamma-alumina washcoat. After the SW-treatment, a small amount of bulk aluminum sulfate was observed near the slightly grown noble metal particles. During the thermal aging, gamma-alumina changed to delta-/theta- and alpha-alumina. In addition, total decomposition of oxidized Pt and partly decomposition of oxidized Pd occurred resulting in the formation of the grown noble metal particles with a bimetallic PtPd core and a polycrystalline PdO shell. Also few, small (similar to 5 nm) bimetallic PtPd particles were still detected. In the TA + SW-treated catalyst with grown noble metal particles, a small amount of bulk aluminum sulfate was detected and it was randomly distributed over the noble metal particles and washcoat. The activity in the terms of methane conversion over the TA-, SW-, and SW + TA-treated catalysts was similar but it was decreased compared to the fresh catalyst. The activity of the TA+SW-treated catalyst was drastically decreased compared to the fresh catalyst due to significant morphological changes and aluminum sulfate formation.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- Thermal aging
- Sulfur poisoning
- Palladium
- Deactivation
- Platinum
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Honkanen, M.
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Karkkainen, M.
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Kolli, T.
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Heikkinen, O.
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Viitanen, V.
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Zeng, Lunjie, 19 ...
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visa fler...
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Jiang, H.
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Kallinen, Kauko
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Huuhtanen, M.
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Keiski, R. L.
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Lahtinen, J.
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Olsson, Eva, 196 ...
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Vippola, M.
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visa färre...
- Om ämnet
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- TEKNIK OCH TEKNOLOGIER
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TEKNIK OCH TEKNO ...
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och Annan teknik
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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och Annan fysik
- Artiklar i publikationen
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Applied Catalysi ...
- Av lärosätet
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Chalmers tekniska högskola