Tous Actualités
Suivre
Abonner Kemira

Kemira

Kemira Develops New Solutions for Reducing Nitrogen Emissions From Diesel Engine Exhaust Gas

Helsinki, Finland (ots/PRNewswire)

The Denoxium product family
developed by Kemira (HEX: KRA1V) helps to reduce the nitrogen
emissions from heavy-duty diesel engines to a level compliant with
the European Union's new strict limit values and to do so more
efficiently than has been possible to date. The new norms come into
effect this year and the next squeeze is due in 2008.
Denoxium products are undergoing trials at this moment with both
automobile and catalyzer manufacturers participating in them. Kemira
is currently investing in Denoxium production at the company's Oulu
production plant and conducting negotiations regarding the
manufacturing and distribution of this product elsewhere in Europe.
Europe's leading automobile manufacturers have shown great
interest in Kemira's DenoxiumTM concept. Tests are being conducted in
engine laboratories and on test circuits. Field tests are also being
conducted by some Nordic automobile manufacturers this winter.
Denoxium is a solution of ammonium formate and urea and it has a
freezing point of -30oC. The product is safe to use and it is
biodegradable.
So far international development efforts and applications in the
field of exhaust gas catalyzers have been focused on solutions in
which the reduction of exhaust gas is based on SCR technology
(Selective Catalytic Reduction) and a dilute urea solution. Nitrogen
oxides are reduced into harmless nitrogen gas by spraying the urea
solution into the vehicle's exhaust gas system. However, this
solution has one practical weakness in practical use - it freezes
when the temperature drops far enough.
As its freezing point is fairly high, -11oC, it means that urea is
difficult to handle, transport, store and use in cold climates, e.g.
in northern Europe. Therefore, costly and fragile heating systems
would be needed in diesel engines and in the logistic chains. In
addition, the capacity of urea in reducing nitrogen oxides is low,
especially at low exhaust gas temperatures. Denoxium works very well
even in these conditions, e.g. in city buses and distribution
vehicles.
Denoxium is fully compatible with urea solutions. Consequently,
there is no need for modifying car engine settings to match a
particular product and both products can be distributed using the
same distribution systems. A suitable solution can also be selected
to match the season of the year: urea in summer and Denoxium in
winter.
Added efficiency can be obtained by using Kemira's DenoxiumPlus
solution, which contains considerably more active ingredient
(ammonia) than the basic urea solution. DenoxiumPlus offers more
mileage (as much as +50%) than the urea solution, which in practice
means an entire service interval without needing to fill up.

Contact:

Kemira Oyj, tel. +358-10-8611; Ilkka Pollari, Vice President, BU
Formics,
Industrial Chemicals, tel. +358-10-862-1510, or mobile
+358-500-601-976; Timo
Härmä, Project Manager, Industrial Chemicals, tel. +358-10-862-1610,
or
mobile +358-50-511-3332