Cu Loading Dependence of Fast NH3-SCR on Cu/SSZ-13

Cui, Yanran; Gao, Feng

doi:10.1007/s40825-019-00117-2

Cu Loading Dependence of Fast NH₃-SCR on Cu/SSZ-13

Journal Article · Wed Mar 27 00:00:00 EDT 2019 · Emission Control Science & Technology

DOI:https://doi.org/10.1007/s40825-019-00117-2· OSTI ID:1717871

Cui, Yanran ^[1]; ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Inst. for Integrated Catalysis

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 NO_x 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 (~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. Furthermore, 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 based zeolite SCR catalysts.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1717871

Report Number(s):: PNNL-SA--140685

Journal Information:: Emission Control Science & Technology, Journal Name: Emission Control Science & Technology Journal Issue: 2 Vol. 5; ISSN 2199-3629

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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