Retrofit emissions reduction technology beats Euro 6 07 February 2012

Test results on a development in retrofit emissions reduction technology have shown it can deliver outstanding results across a wide range of pollutants, according to developer Eminox.

The data from a Euro 3 bus retrofitted with Eminox SCRT (selective catalytic reduction – continuously regenerating trap) technology has demonstrated emissions results that not even today's Euro 5 vehicles are expected to achieve.

Kathye Henderson, marketing manager at Eminox, explains that this development of SCRT is the technology now being applied to London's buses as part of a pilot project run by TfL (Transport for London).

SCRT has already been used to reduce emissions of particulate matter (PM) and nitrogen oxides (NOx), as part of clean-up programmes in Spain, Belgium, Edinburgh and Oxford.

The system combines diesel particulate filter and selective catalytic reduction technology and was designed for retrofit to heavy duty vehicles.

However, the requirements for the London project presented new challenges, with a need specifically to target nitrogen dioxide (NO2) as well as maintaining other reductions. This was key in driving the development of a new generation of SCRT technology, states Henderson.

Independent tests were carried out on the MLTB cycle, which simulates London operating conditions, and the new SCRT system was able to reduce NOx by almost 90% and NO2 by more than 50%, with Euro 6 compliant secondary emissions, she says.

"We are delighted with these test results, which lead the way in retrofit emissions reduction," states Henderson. "The use of a London test cycle, which will be backed by in-use data, also confirms without doubt that SCRT technology can be effective in urban environments."

In brief detail, Henderson explains that what's changed is the application of a new catalyst formulation and different system calibration. Eminox stresses that there is still much work to be done to ensure that these types of reductions can be achieved on other heavy vehicles, but believes the results show a real breakthrough in emissions technology.

The hope: older vehicles can be upgraded and used long into the future, as the requirement to reduce emissions increases.

Author
Brian Tinham

Related Companies
Eminox Ltd

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