Journal
EMISSION CONTROL SCIENCE AND TECHNOLOGY
Volume 5, Issue 2, Pages 124-132Publisher
SPRINGERNATURE
DOI: 10.1007/s40825-019-00117-2
Keywords
Ammonia SCR; Standard SCR; Fast SCR; Cu/SSZ-13; Reaction kinetics; Reaction mechanism
Categories
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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The fast NH3-SCR kinetics are studied on Cu/SSZ-13 with different Cu loadings, under reaction conditions (temperature and space velocity) where both steady-state and differential NOx conversions are readily achieved. Cu loading is found to greatly influence low-temperature NOx turnover rates, however not to substantially affect apparent activation energies. The high reaction apparent activation energies (similar to 160 kJ/mol) suggest that the rate-limiting kinetics for fast SCR involve the participation of NH4NO3, an intermediate that is of considerable stability in small-pore zeolites. The energetically demanding NH4NO3+NO reactions make low-temperature fast SCR much slower than standard SCR over Cu-exchanged small-pore zeolite catalysts, in drastic contrast to vanadium and medium/large pore zeolite-based SCR catalysts.
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