Air treatment

Greenhouse gas emissions reduction (N2O)


Medium temperature catalyst (400 - 430°C)

IRMA / GPN SA patent

Catalyst: iron exchanged zeolite

Catalyst: iron exchanged zeolite Extrudate : ø 1,8 mm or 3,5 mm

Unité de Glyoxal

Glyoxal unit
DN2O > > 95% decomposition
(10 to 12% N2O)

Industrial reference: Clariant (France) SA

Development :

High temperature catalyst

Under development on industrial scale

Catalyst based on mixed oxide

Catalyst based on mixed oxide
Extrudate : ø 1,8 mm or 3,5 mm
IRMA / GPSA Patent





Application: nitric acid unit
after platinum fabrics
T : 850 - 900°C

X : Catalytic Reduction

Catalyst : development new formulation, catalyst manufacture


4 NO + 4 NH3 + O2 -> 4 N2 + 6 H2o NO + NO2 +2 NH31 -> 2 N2 + 3 H2O

Catalyst : based on zeolites :
Several formulations depending on operating condition and effluent composition.

Extrudés ø 3,5 mm

Extrudates ø 3,5 mm

Nid d’abeille

Honeycomb : development with CTI

SCR catalysts (Selective Catalytic Reduction) : NH3 or urea

Axens IRMA can offer :
  • Catalyst with guaranties
  • Basic design ; PID
  • Engineering constructor (subcontractor)
  • Technical assistance on site
Industrial references :
  • Saint Gobain Céramiques industrielles (avec Solios Environnement)
  • AXENS
  • CLARIANT
  • GPN in 2008 (12 m3)

Pilot test on site

unité pilote UIOM

IRMA propose pilot test on site in case of specific effluents in order to guarantee catalyst efficiency and stability.
Ex : Test on Waste Incinerator


  • Catalyst : Honeycomb 100 cpsi zeolite coating on cordierite
  • Conditions :
    • Flow : 10 to 50 Nm3/h
    • Température : 300°C
    • VVH : 20 000 h-1
  • Efficiency :
    • NOX abatment > 90%
    • NH3 slip < 10 mg/Nm3
  • Expertises :
    • SCR industrial unit
    • Catalyst evaluation on samples and pilot test at IRMA /
      • Aging
      • Physicochemical caracteristics

Denox : R and D

New concept and new formulation :
  • Reduction by hydrocarbon, alcohol : Diesel application
  • Reduction by CH4 : Patent on zeolite catalyst with GDF
  • SCR for mobile sources (truck, bus)
  • Association FAP – Sic (CTI) with Denox catalyst

Analyze and treatment of the VOC by catalytic oxidation

Technical expertise

  • Gas analysis
  • VOC emission diagnosis
  • Feasibility studies
GC-MS

GC-MS

Analyse sur site

Analyse on site

FID

FID

Analyse sur site

VOC pilot unit : 50 Nm3/h

Modular and compact equipment, assistance in the integration of the equipment in the company process

Unité sur effluent de chimie fine

Catalytic oxidation unit (Fine chemical site)

Unité de test catalytique sur site industriel

Catalytic unit on factory site


Industrial reference:

  • Roquette
  • Guerbet

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