Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Marja Kärkkäinen"'
Autor:
Mika Huuhtanen, Tomi Kanerva, Riitta L. Keiski, Marja Kärkkäinen, Minnamari Vippola, Kimmo Lahtonen, Ari Väliheikki, Kauko Kallinen, Mari Honkanen
Publikováno v:
Journal of Catalysis. 397:183-191
Simultaneous poisoning of sulfur + phosphorus on a platinum-based diesel oxidation catalyst was studied to gain a deeper understanding on the catalyst deactivation. Compared to a single poisoning (sulfur or phosphorus), the simultaneous poisoning had
Autor:
Marja Kärkkäinen, Jaakko Akola, Riitta L. Keiski, Kauko Kallinen, Minnamari Vippola, Jianguang Wang, Mika Huuhtanen, Mari Honkanen, Hua Jiang
Publikováno v:
JOURNAL OF CATALYSIS. 358:253-265
Sulfur deactivation and regeneration behavior of the Pd/Al2O3 catalyst has been investigated via experimental characterization and density functional theory (DFT) simulations. During the sulfur exposure, PdO crystallites grow slightly while bulk Al2(
Autor:
Kauko Kallinen, Minnamari Vippola, Jouko Lahtinen, Riitta L. Keiski, Mari Honkanen, Mika Huuhtanen, Ari Väliheikki, Tanja Kolli, Olli Heikkinen, Marja Kärkkäinen
Publikováno v:
Applied Catalysis B: Environmental. 218:409-419
The impact of sulphur, phosphorus and water and their co-exposure on a monolith-type Pt/SiO 2 -ZrO 2 diesel oxidation catalyst was investigated. The accelerated laboratory-scale sulphur treatments for Pt/SiO 2 -ZrO 2 were done with and without water
Autor:
Stéphane Pronier, Teuvo Maunula, Bouchra Darif, Rachid Brahmi, Riitta L. Keiski, Satu Ojala, Marja Kärkkäinen
Publikováno v:
Applied Catalysis B: Environmental. 206:653-665
In the present research, an industrially aged Pt/Al 2 O 3 catalyst was used as a basis for the study on the sulfur deactivation and the development of more resistant catalytic materials. The catalytic activities of both industrially and laboratory-ag
Autor:
Mika Huuhtanen, Mari Honkanen, Olli Heikkinen, Jouko Lahtinen, Riitta L. Keiski, Minnamari Vippola, Jakob Birkedal Wagner, Kauko Kallinen, Marja Kärkkäinen, Hua Jiang, Thomas Willum Hansen
Publikováno v:
JOURNAL OF CATALYSIS. 349:19-29
Structural changes of PtPd nanoparticles in a natural gas oxidation catalyst were studied at elevated temperatures in air and low-oxygen conditions and in situ using environmental transmission electron microscopy (ETEM). The fresh catalyst shows
Autor:
Mika Huuhtanen, Riitta L. Keiski, Minnamari Vippola, Mari Honkanen, Marja Kärkkäinen, Tanja Kolli, Ari Väliheikki, Olli Heikkinen, Kauko Kallinen, Jouko Lahtinen
Publikováno v:
Topics in Catalysis. 60:307-311
The effect of sulphur and phosphorus on a Pt/SiO2–ZrO2 catalyst was studied. The laboratory accelerated sulphur (SW) or phosphorus (PW), and their co-exposure (PSW) treatments were done in gas phase for 5 h at 400 °C. The fresh and treated catalys
Autor:
Kauko Kallinen, Minnamari Vippola, Riitta L. Keiski, Mika Huuhtanen, Mari Honkanen, Jouko Lahtinen, Ari Väliheikki, Tanja Kolli, Olli Heikkinen, Marja Kärkkäinen
Publikováno v:
Topics in Catalysis. 59:1044-1048
Phosphorus is found to have a deactivating effect on the catalytic activity of the studied natural-gas-oxidation catalyst. Accelerated laboratory-scale phosphorus treatment was done to the PtPd/Al2O3 natural gas oxidation catalyst. The effect of phos
Autor:
Jouko Lahtinen, Mari Honkanen, Riitta L. Keiski, Tanja Kolli, Mika Huuhtanen, Marja Kärkkäinen, Kauko Kallinen, Minnamari Vippola, Toivo Lepistö, Olli Heikkinen
Publikováno v:
Topics in Catalysis. 58:961-970
The effects of phosphorus poisoning on the activity of PtPd and Pt diesel oxidation catalysts and on the activity of the support material were investigated using the gas phase laboratory-scale-aging procedure. The catalysts were treated using two dif
Autor:
Mari Honkanen, Riitta L. Keiski, Kauko Kallinen, Minnamari Vippola, Mika Huuhtanen, Jouko Lahtinen, Marja Kärkkäinen, Toivo Lepistö, Anna Valtanen, Ville Viitanen, Tanja Kolli
Publikováno v:
Topics in Catalysis. 56:672-678
The activity of sulphur–water- and water-treated PtPd/Al2O3- and Pt/Al2O3-based monolith catalysts was investigated. The catalysts were characterized by X-ray photoelectron fluorescence, X-ray photoelectron spectroscopy, transmission electron micro
Autor:
Mari Honkanen, Marja Kärkkäinen, Mika Huuhtanen, Riitta L. Keiski, Toivo Lepistö, Minnamari Vippola, Olli Heikkinen, Tanja Kolli, Kauko Kallinen, Jouko Lahtinen
Phosphorus poisoning and its effect on the diesel oxidation catalysts morphology was studied by transmission electron microscopy (TEM). The studied catalyst samples were PtPd or Pt supported on the alumina-based washcoat including additives. The labo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3af884de5494bc7e370c24bba471cdb4
https://trepo.tuni.fi/handle/10024/125694
https://trepo.tuni.fi/handle/10024/125694