Impact of Copper Loading on NH3-Selective Catalytic Reduction, Oxidation Reactions and N2O Formation over Cu/SAPO-34
Journal article, 2017

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, NH3 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 NH3 adsorption. As expected, activity of all reactions increased with copper loading, due to increased number of active sites. However, the N2O formation during standard and fast SCR yielded interesting mechanistic information. We observed that N2O formation at low temperature increased with copper loading for the standard SCR reaction, while it decreased for fast SCR. The low-temperature N2O formation during fast SCR thus occurs predominantly over Bronsted sites. Species responsible for N2O 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 Bronsted sites in SAPO-34 are thus active for the fast SCR reaction.

Cu/SAPO-34

ammonia oxidation

fast SCR

copper loading

selective catalytic reduction (SCR)

chabazite

N2O

Author

Kirsten Leistner

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Reaction Engineering

Florian Brüsewitz

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Reaction Engineering

Kurnia Wijayanti

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Reaction Engineering

A. Kumar

Cummins Inc.

K. Kamasamudram

Cummins Inc.

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Reaction Engineering

Energies

1996-1073 (ISSN)

Vol. 10 4 489

Subject Categories

Chemical Sciences

DOI

10.3390/en10040489

More information

Created

10/7/2017