engine emissions

An Expansive Portfolio of Catalytic Technology.


Top Tier Technology to Serve the Internal Combustion Engine Market

The four key harmful byproducts of combustion engines are hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx), and Particulate Matter (PM or soot)

Depending on the fuel type and the design of the engines operation, different emission catalysts can be utilized to treat these byproducts

Spark Ignited engines typically use gasoline or natural gas as fuel and require a three way catalyst (TWC) to treat emission products

Compression Ignited engines often use diesel as fuel and may require up to four separate catalysts to treat emissions. Those catalysts are typically: Diesel Oxidation Catalyst (DOC), Diesel Particulate Filter (DPF), Selective Catalytic Reduction (SCR) and Ammonia Slip Catalyst (ASC)

CDTi has over 20+ Years of TWC Catalyst Technology Development and Product Manufacturing

We have focused on development of technologies to drive catalyst performance while reducing use of Precious Group Metals (PGM) as such as Platinum (Pt), Palladium (Pd), and Rhodium (Rh).

Over 20+ years, we have manufactured over 14 million catalysts for passenger cars, supplied to global OEMs

CDTi offers a variety of technologies and products to address diesel emission systems. These can be provided as Stand-along components, or integrated into complete Aftertreatment systems. They are designed for On-Road, Off-Road, Stationary and Industrial applications

– Diesel oxidation catalyst (DOC), with low NO2 selectivity where appropriate for application

– Catalyzed and Uncatalyzed Diesel particulate filter (DPF), with or without Active Regeneration system

– Bi functional catalyst which can function as both selective catalytic reduction (SCR) and ammonia slip catalyst (ASC)

Three Way Catalysts

  • highly efficient

    Low PGM formulations for the control of Hydrocarbons, Carbon Monoxide & NOx

  • Patented Technology

    Reduces sintering and enhances PGM performance on three & four way catalysts

  • industry leading

    Dynamic oxygen storage capabilities 


patents & publications


Spinel™ for Three Way Catalysts

Spinel™ technology has been awarded the DOE program DE-EE0008332 for its ultra-high oxygen storage capacity to be used in vehicle emission control.


    1. Enhanced NO, CO and C3H6 conversion on Pt/Pd catalysts: Impact of oxygen storage material and catalyst architecture, Catalysis Today 2021
    2. Coupled methane and NOx conversion on Pt + Pd/Al2O3 monolith: Conversion enhancement through feed modulation and Mn0.5Fe2.5O4 spinel addition", Catalysis Today 2021
    3. "Dynamic Oxygen Storage Capacity of Ceria-Zirconia and Mn0.5Fe2.5O4 Spinel: Experiments and Modeling", Ind. Eng. Chem. Res. 2021

Patents for Spinel™ OSC, Pt/Rh, Pt/Pd technology:

US201715499087, WO2017195065A1,  EP3461264A1, CN109153007

US10533472, WO2017195134A1, CN109152987, US10253669B2

Patents for BMARS™ - Rh technology: 

US9579604, US9604175, US9475004, US9475005, US316388

Patents for Gasoline Particulate Filter (GPF) technology: 




  • diesel oxidation catalyst

    Standalone emission reduction device or included as multi stage system for downstream benefits.

  • Diesel Particulate Filter

    Provides 99% reduction of particulate matter and conversion of dangerous diesel engine emissions.

  • Selective Catalytic Reduction / Ammonia Slip Catalyst

    Zeolite based technology that allows a wide range of urea dosing with inherent slip control function.

Liqtech denmark vs Pirelli 004

technology features

Supported with SPGM™ and MPC® technology platforms, the CDTi diesel oxidation catalyst (DOC) features a robust low temperature NO to NO2 reaction for downstream DPF and SCR treatments, effective CO & HC exothermicity with demonstrated durability.

Using the MPC® technology platform, CDTi offers highly efficient and cost effective catalyzed Diesel Particulate Filter (cDPF). Uncatalysed DPF is available.

With Zeolite-based NOx solutions, CDTi Selective Catalytic Reduction (SCR) and Ammonia Slip Catalyst (ASC) technology features low temperature activity and unique formulations to integrate ammonia slip function onto a single monolith.


  • DOC: US8323601, US9511350
  • DPF: US8318629, US8241403, US7473288, US7470407
  • SCR/ASC: US7785551, US7527776B2, WO2008085265A1, EP2125197A4, CN101443116, US7767175, US7943097, WO2009137008, EP2318764A4, CN102203507B

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