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Emission Control Science and Technology
Published in: Emission Control Science and Technology 2/2019

27-03-2019 | Special Issue: 2018 CLEERS Workshop, September 18-20, Ann Arbor, Michigan, United States

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

Authors: Yanran Cui, Feng Gao

Published in: Emission Control Science and Technology | Issue 2/2019

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Abstract

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 (~ 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.
previous article Oxidative Reactivity of Particulate Samples from Different Diesel Combustion Systems and Its Relation to Structural and Spectral Characteristics of Soot
next article Development of a 2D Model of a SCR Catalyst on a DPF

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Metadata
Title
Cu Loading Dependence of Fast NH3-SCR on Cu/SSZ-13
Authors
Yanran Cui
Feng Gao
Publication date
27-03-2019
Publisher
Springer International Publishing
Published in
Emission Control Science and Technology / Issue 2/2019
Print ISSN: 2199-3629
Electronic ISSN: 2199-3637
DOI
https://doi.org/10.1007/s40825-019-00117-2

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