1 PM reduction over vanadium SCR
Heavy-Duty-, On- und Off-Highway-Motoren 2016
11. Internationale MTZ-Fachtagung
Referent(in): M. Sc. Alexander Feiling, Prof. Dr. techn. Christian Beidl
Emission limits and legislative boundaries at the On-Road and Off-Road applications are steadily
tightened. Beside Europe and the USA even at the BRICS states (Brazil, Russia, India, China, South
Africa) a stricter legislation is visible.
Additionally to the emissions of carbon monoxide (CO) and hydrocarbon (HC) also of nitrogen oxide
(NOx) and particulate matter (PM) are provided with lower limits. Optimization of engine parameters
like EGR and injection technology is not sufficient. Adapted exhaust gas aftertreatment (EGA) systems
have to be used to reach the targets. A combination of different catalyst systems are suitable.
Recent EU6 systems use particulate filters, Diesel oxidation catalysts (DOC) as well as lean NOx trap
catalysts or SCR systems. For emerging markets, the combination of increased mobility requirements
and the need of cheap and resilient exhaust gas aftertreatment systems lead to SCR-only systems
based on vanadium (V-SCR). Beside the positive effect of low costs, vanadium SCR systems show a
positive particulate emission reducing effect under different circumstances. The observed values for
PM and hydrocarbons present significant reductions, but this property has not yet been adequately
studied and understood. CO2 is the favoured outcome after oxidation, but also CO and by-products of
partial oxidation can be found.
In this paper, the mechanism for the oxidation at the vanadium SCR catalyst are more precisely identified
and analyzed. From the experimental data, results models are generated, which are used for a
sensitivity analysis of the influencing parameters and their interactions. For example the EGR rate,
boost pressure and the injection timing are directly modified, while boundary conditions as the exhaust
gas temperature, space velocity and the particulate morphology as well as the gaseous emission are
changing. With the DoE methodology, the influence and the interactions between all these parameters
are described and the oxidation effect can be investigated.
With the mathematical DoE models, a multicriteria optimization shows the potential of the PM reduction
effect considering particulate emissions, CO2 and nitrogen oxide emissions. This illustrates the
possibility of transferability of the mechanism to a series application.
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