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Eminox, Amminex develop ammonia-SCR retrofit system for London ULEZ

2 November 2018

UK’s Eminox, in partnership with Denmark’s Amminex, has developed a retrofit DPF+SCR system for heavy-duty diesel vehicles that can reduce emissions to below Euro VI levels, satisfying the requirements of the upcoming Ultra-Low Emission Zone (ULEZ) in London.

The companies received their first order for the system. The City of Westminster and its waste management operator Veolia have ordered a retrofit of 92 refuse collection vehicles (RCV) that are operated in the center of London. The retrofit order marks the first time a fleet of RCVs will be upgraded to Euro VI equivalent levels—according to Amminex—and the Eminox/Amminex combo is so far the only solution having been approved by the official Clean Vehicle Retrofit Accreditation Scheme (CVRAS) for retrofitting RCVs.

The system combines a diesel particulate filter (DPF) with selective catalytic reduction (SCR), using ammonia supplied by the Amminex ASDS technology as the SCR reductant. ASDS stores reactive ammonia gas in solid state by binding it to a salt called AdAmmine™. When heated, AdAmmine releases NH3, which is then dosed to the SCR reactor.

The CVRAS approval involves emission testing over a chassis dynamometer RCV driving cycle that includes a long “dense urban collection” segment of low speed driving with low exhaust temperatures. The NOx reduction performance during the low temperature operation was enabled by the ASDS system, where the NH3 reductant can be supplied to the SCR catalyst at lower exhaust temperatures, compared to urea-based SCR systems.

The two first demonstration vehicles have been on the road for over a month. According to data from the NOxTracker™ datalogging tool that is a part of the system, the average NOx reduction was more than 94%.

The London ULEZ is to be introduced in the city center in early 2019, and further expanded in 2021. Drivers of diesel cars and vans below the Euro 6 emission standard, and petrol cars and vans below the Euro 4 standard, will have to pay a daily charge of £12.50 to enter the zone. For heavy goods vehicles (HGVs) below the Euro VI emission standard, the charge will total £100 per day.

Source: Amminex