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The Impact of Lanthanum and Zeolite Structure on Hydrocarbon Storage

Jonsson, Rasmus, 1989 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
Ho, Hoang Phuoc, 1983 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
Wang, Aiyong, 1989 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
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Skoglundh, Magnus, 1965 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
Olsson, Louise, 1974 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
visa färre...
 (creator_code:org_t)
2021-05-15
2021
Engelska.
Ingår i: Catalysts. - : MDPI AG. - 2073-4344. ; 11:5
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Hydrocarbon traps can be used to bridge the temperature gap from the cold start of a vehicle until the exhaust after-treatment catalyst has reached its operating temperature. In this work, we investigate the effect of zeolite structure (ZSM-5, BEA, SSZ-13) and the effect of La addition to H-BEA and H-ZSM-5 on the hydrocarbon storage capacity by temperature-programmed desorption and DRIFT spectroscopy. The results show that the presence of La has a significant effect on the adsorption characteristics of toluene on the BEA-supported La materials. A low loading of La onto zeolite BEA (2% La-BEA) improves not only the toluene adsorption capacity but also the retention of toluene. However, a higher loading of La results in a decrease in the adsorbed amount of toluene, which likely is due to partial blocking of the pore of the support. High loadings of La in BEA result in a contraction of the unit cell of the zeolite as evidenced by XRD. A synergetic effect of having simultaneously different types of hydrocarbons (toluene, propene, and propane) in the feed is found for samples containing ZSM-5, where the desorption temperature of propane increases, and the quantity that desorbed increases by a factor of four. This is found to be due to the interaction between toluene and propane inside the structure of the zeolite.

Ämnesord

NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Kemiteknik -- Annan kemiteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Chemical Engineering -- Other Chemical Engineering (hsv//eng)

Nyckelord

cold start
lanthanum
toluene
zeolite
HC trap
gasoline
La-BEA

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