Engineering HC-SCR: Improved Low Temperature Performance through a Cascade Concept |
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| Authors: | K Arve F Klingstedt K Eränen L-E Lindfors D Yu Murzin |
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| Affiliation: | 1. Laboratory of Industrial Chemistry, Process Chemistry Centre, ?bo Akademi University, Biskopsgatan 8, 20500, ?bo/Turku, Finland
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| Abstract: | A catalytic after treatment system for lean HC-SCR was constructed of two different catalyst beds, e.g. of a Ag/alumina and
Cu-ZSM-5 catalyst (cascade concept). The improved activity especially at low temperature range was found to be due to the
synergetic effect of the two catalysts, which combines the transformation of the feed gas over Ag/alumina to such compounds
that are highly reactive towards N2 over Cu-ZSM-5. The effluent coming from the Ag/alumina bed was analysed by GC–MS along with the NO to N2 conversion over the whole system by GC. The results obtained from the GC–MS measurements revealed that hydrocarbon used as
a reducing agent is oxidised and that besides oxygenates also various N-containing hydrocarbons are formed over the Ag/Al2O3. |
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| Keywords: | engineering HC-SCR Ag/alumina and Cu-ZSM-5 catalyst catalyst cascade concept |
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