ACCTNovel NOx emission reduction system

The technology

Industrially significant results

98%+ NOx reduction achieved
Exceptional performance by ACCT-equipped passenger vehicle during high-load, lower ambient temperature driving (Majola Pass – Swiss Alps, April 2019)


The ACCT technology offers significant advantages over existing ammonia delivery systems for SCR which are unable to function effectively at low exhaust temperatures and can generate harmful deposits within a vehicle’s exhaust.

Audi Prototype – mountain pass, using stock AdBlue ~ 46% NOx reduction

Graph showing 98% NOx reduction

Audi Prototype – Mountain pass using ACCT ~ 98% NOx reduction

‌‌Graph showing the Audi prototype NOx reduction

ACCT has excellent ammonia response times and availability as low as 50°C with full decomposition from 100°C:

  • generates ammonia at almost all exhaust temperatures
  • faster response for highly controllable ammonia delivery
  • no deposit build-up, preventing any damage to the engine or after-treatment.

It is common, in existing systems, for the decomposition of AdBlue™ to be only partially complete before its arrival at the SCR catalyst. This can lead to deposit creation and requires either the SCR catalyst or an additional hydrolysis catalyst to complete decomposition.

With ACCT, decomposition is complete before the catalyst. So, there is no potential for the build-up of residue – allowing the control system to react more quickly.

THE award innovation Autocar Awards 
IET innovation finalist  NAQ award innovation finalist  NAQ award leader finalist

Underpinning research was funded by Loughborough University, commercialisation activities have been supported by:
Research England’s Higher Education Innovation Fund, EPSRC Impact Acceleration Account.