SCR Diesel catalysts

The Euro 4 standard has dramatically tightened the NOx emission limits for all vehicles weighing over 3.5 tonnes – from 3.5 g NOx/kWh in 2005 to 2 g from 2009 onwards and 0.4 g from 2013 on.


The special tests used for automotive catalysts are:

  • 3D contour measurement of the cylinder surface area using laser triangulation, to ensure that the canning dimensions are correct;
  • Isostatic compression strength testing, to ensure that the diesel catalyst withstands the high retaining forces exerted by the ceramic mats required for vehicle use.


Our SCR diesel catalysts are homogeneous extrudates consisting of catalytically active oxides. The large surface and pore volume bring the following major benefits:

  • High activity and selectivity
  • Outstanding sorption and oxidation of hydrocarbons and soot particles
  • High ammonia storage capacity
  • Exceptional durability
  • Negligible greenhouse gas formation
  • Excellent low temperature activity

Product features 

  • Unsupported extrudate with 90% catalytically active oxide content
  • Current dimensions:
  • Diameter: 5.66–13”
  • Cell density: up to 400 cpsi
  • Length: as required
  • Physical structure: particles with diameters of 20–50 nanometres
  • Porosity: >50%
  • Specific BET surface area: >50 m2/g
  • Glass fibre in the active oxide matrix results in high mechanical strength


Our R&D efforts covers all aspects of the life cycle of a catalyst, from improvements to existing products in collaboration with material suppliers and research into new systems through to production process development and optimization, and customized applications. The expertise of the scientists and engineers in our development department spans all the technological skills required to supply best-practice catalysts for customers’ applications. They have access to a wealth of experience in the department, and regular training and development programs.

The department’s ongoing activities include:

  • Continuous improvement of existing products and processes
  • Development and commercialisation of new extrusion materials
  • Development of new applications for existing materials

PDF Download production process and reaction description (CERAM Diesel catalysts)   

For more details, please contact the PRODUCT MANAGERS