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Impact of Copper Loading on NH3-Selective Catalytic Reduction, Oxidation Reactions and N2O Formation over Cu/SAPO-34
- Source :
- Energies, Vol 10, Iss 4, p 489 (2017), Energies; Volume 10; Issue 4; Pages: 489
- Publication Year :
- 2017
- Publisher :
- MDPI AG, 2017.
-
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, NH3 oxidation and NO oxidation reactions. They were further characterised using X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), H2-temperature programmed reduction (H2-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 Brønsted 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 Brønsted sites in SAPO-34 are thus active for the fast SCR reaction.
- Subjects :
- Control and Optimization
Cu/SAPO-34
Inorganic chemistry
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
lcsh:Technology
01 natural sciences
Redox
Catalysis
fast SCR
Adsorption
selective catalytic reduction (SCR)
copper loading
chabazite
ammonia oxidation
N2O
Electrical and Electronic Engineering
Engineering (miscellaneous)
Aqueous solution
Ion exchange
lcsh:T
Renewable Energy, Sustainability and the Environment
Selective catalytic reduction
021001 nanoscience & nanotechnology
Copper
0104 chemical sciences
chemistry
0210 nano-technology
Selectivity
Energy (miscellaneous)
Subjects
Details
- ISSN :
- 19961073
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Energies
- Accession number :
- edsair.doi.dedup.....912662235eb49fad555e3d0c5b1c2160
- Full Text :
- https://doi.org/10.3390/en10040489