Journal
CATALYSIS TODAY
Volume 339, Issue -, Pages 233-240Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2019.02.037
Keywords
SCR; Cu exchanged zeolite; Catalyst; SSZ-13; Chabazite; Sodium ion; Co-catalyst
Funding
- US Department of Energy (DOE), Energy Efficiency and Renewable Energy, Vehicle Technologies Office
- DOE's Office of Biological and Environmental Research
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A series of Cu/H-SSZ-13 and Cu/Na-SSZ-13 catalysts are synthesized, degreened and hydrothermally aged for use in the standard NH3-SCR reaction. Surface area/pore volume and XRD analyses are used to probe the textural properties of the catalysts. H-2-TPR and EPR are used to quantitatively describe the various Cu species. NH3-SCR is carried out at a lower space velocity to probe the light-off behavior, and a higher space velocity to generate data for kinetic analysis. Na+ co-cation addition is found to promote turnover rates of isolated Cu-ions at low reaction temperatures. However, as Cu loadings increase, this promoting effect is compromised by decreases in Cu exchange capacity and hydrothermal stability of the Cu/Na-SSZ-13 catalysts.
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