Impact of Copper Loading on NH 3 -Selective Catalytic Reduction, Oxidation Reactions and N 2 O Formation over Cu/SAPO-34

Kirsten Leistner, Florian Brüsewitz, Kurnia Wijayanti, Ashok Kumar, Krishna Kamasamudram and Louise Olsson
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Kirsten Leistner: Competence Centre for Catalysis, Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
Florian Brüsewitz: Competence Centre for Catalysis, Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
Kurnia Wijayanti: Competence Centre for Catalysis, Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
Ashok Kumar: Cummins Inc., 1900 McKinley Ave, MC 50183, Columbus, IN 47201, USA
Krishna Kamasamudram: Cummins Inc., 1900 McKinley Ave, MC 50183, Columbus, IN 47201, USA
Louise Olsson: Competence Centre for Catalysis, Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden

Energies, 2017, vol. 10, issue 4, 1-20

Abstract: We developed a procedure for aqueous ion exchange to obtain different Cu loadings of Cu/SAPO-34 (between 0 and 2.6 wt %.) The catalysts were washcoated on monoliths and characterised with respect to their activity and selectivity under standard selective catalytic reduction (SCR), fast SCR, NH 3 oxidation and NO oxidation reactions. They were further characterised using X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), H 2 -temperature programmed reduction (H 2 -TPR), ultraviolet (UV)-vis spectroscopy and NH 3 adsorption. As expected, activity of all reactions increased with copper loading, due to increased number of active sites. However, the N 2 O formation during standard and fast SCR yielded interesting mechanistic information. We observed that N 2 O formation at low temperature increased with copper loading for the standard SCR reaction, while it decreased for fast SCR. The low-temperature N 2 O formation during fast SCR thus occurs predominantly over Brønsted sites. Species responsible for N 2 O formation during standard SCR, on the other hand, are formed on the copper sites. We further found that the fast SCR reaction occurs to a significant extent even over the H/SAPO-34 form. The Brønsted sites in SAPO-34 are thus active for the fast SCR reaction.

Keywords: selective catalytic reduction (SCR); Cu/SAPO-34; copper loading; chabazite; fast SCR; ammonia oxidation; N2O (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
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