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Impact of Biodiesel-Based Phosphorus and Sulfur on Copper Speciation of Cu-SSZ-13 Catalysts : XAFS Scanning during H-2-TPR
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- Mesilov, Vitaly (författare)
- Yale NUS Coll, Sci Div, Singapore 138527, Singapore.
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- Dahlin, Sandra (författare)
- KTH,Processteknologi,Scania CV AB, S-15187 Södertälje, Sweden.;Dahlin Catalyt, S-15240 Södertälje, Sweden.
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- Bergman, Susanna L. (författare)
- Yale NUS Coll, Sci Div, Singapore 138527, Singapore.
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- Yale NUS Coll, Sci Div, Singapore 138527, Singapore Processteknologi (creator_code:org_t)
- 2022-02-16
- 2022
- Engelska.
- Ingår i: The Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 126:7, s. 3385-3396
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Biodiesel is a promising renewable fuel, which may help to limit our dependence on fossil fuels. However, the presence of contaminants in biodiesel can affect the Cu speciation of the Cu-SSZ-13 selective catalytic reduction (SCR) catalyst, resulting in its deactivation and decreased durability. In situ Cu K-edge X-ray absorption fine structure (XAFS) scanning during a temperature-programmed reduction in hydrogen (H-2-TPR) has been applied here for the analysis of Cu speciation in Cu-SSZ-13 catalysts aged using pure and contaminated biodiesel fuels. XAFS data were analyzed using the multivariate curve resolution alternating least-squares (MCR-ALS) method. While only reduction from Cu-II to Cu-I was observed at temperatures below 500 degrees C for the catalyst aged using pure biodiesel, a one-step reduction of Cu-II to Cu-0 at temperatures between 400 and 500 degrees C was found for the catalyst aged using P-doped biodiesel. The transformation of isolated CuII species to Cu-II clusters was suggested for the catalyst as a result of aging using P-doped biodiesel. The catalyst aged using S-doped biodiesel showed mainly the reduction of isolated Cu-II to Cu-I, which was inhibited as compared to that observed for the catalyst aged using pure biodiesel. The reduction of the catalyst aged using P+S-doped biodiesel led to the reduction of Cu-II to both Cu-I and Cu-0. The phosphorus was responsible for the formation of Cu-II clusters during aging of the catalyst using P+S-doped biodiesel. This study reveals that the presence of phosphorus in biofuels should be strictly regulated to avoid major changes in the Cu speciation of Cu-SSZ-13 catalysts.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Kemiska processer (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Chemical Process Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Annan kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Other Chemical Engineering (hsv//eng)
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
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- Mesilov, Vitaly
- Dahlin, Sandra
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- Xi, Shibo
- Englund, Johanna
- Malm, Henrik
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