Browse Learn C0913

Selective Catalytic Reduction for Diesel Engines C0913

Stringent requirements of reduced NOx emission limits in the US have presented engineers and technical staff with numerous challenges. Several in-cylinder technical solutions have been developed for diesel engines to meet 2010 emission standards. These technologies have been optimized and have yielded impressive engine-out results in their ability to reduce emissions to extremely low levels. However, current and state-of-the-art in-cylinder solutions have fallen short of achieving the limits imposed on diesel emissions for 2010. To help meet emissions requirements, the catalyst industry has developed exhaust emission reduction technologies with impressive levels of performance. These technologies include hydrocarbon selective catalytic reduction (SCR), NOx absorber catalysts, and urea SCR.

This seminar will begin with an explanation of NOx formation in diesel engines and in-cylinder methods for reducing these emissions. The aftertreatment systems for NOx reduction will be explained and the advantages and disadvantages of these emission reduction technologies will be discussed.

In this two-day seminar, the primary focus is on urea SCR and its technology will be fully examined. The important chemical reactions and methods for improving SCR performance by encouraging desirable reactions and avoiding undesirable reactions are explained. Additionally, the components and control of a urea SCR system are detailed and the necessary sensors for its control are described. The SAE paper Laboratory Testing of Urea-SCR Formulations to Meet Tier 2 Bin 5 Emissions is included in the course materials.

Learning Objectives
By attending this seminar you will be able to:
  • Identify how NOx is formed in diesel engines
  • Identify the in-cylinder means for reducing NOx
  • Evaluate NOx aftertreatment technologies for diesel exhaust.
  • Describe the characteristic of selectivity in catalytic aftertreatment
  • Apply selectivity to urea SCR
  • Describe the features and components of a complete urea SCR system
  • Learn how to optimize the control of a urea SCR
  • Distinguish the differences between various catalytic SCR formulations

Who Should Attend
This seminar will benefit engineers and technical staff who are developing urea aftertreatment systems for diesel engines, including catalyst engineers who supply NOx aftertreatment systems to the diesel industry. Also benefitting will be suppliers of other NOx reducing technologies, such as EGR components and fuel injection systems, as well as on-highway and off-highway diesel engine technical staff.

Attendees should have knowledge of how a diesel engine operates, including its 4-stroke operation. Additionally, attendees should have basic knowledge of the emission formation mechanism in internal combustion engines.
  • Introduction
    • On-Highway diesel emission regulations
    • Non-Road diesel emission regulations
    • Passenger car diesel emission regulations
    • Light-Truck diesel emission regulations
    • EURO IV Regulations
    • EURO V Regulations
    • NOx regulations in Japan
    • Drivers for controlling NOx
  • NOx Formation in Diesel Engines
    • Diffusion combustion model
    • The Zeldovich Mechanism
    • Pressure/Crank angle diagram
    • Heat release rate
  • In-Cylinder Means for NOx Reduction
    • Injection timing retard
    • Multiple injections/combustion cycle
    • Charge air cooling
    • Exhaust gas recirculation
  • NOx Aftertreatment Systems for Diesel Engines
    • Lean NOx Catalysts (LNC), DeNOx Catalysts, HC SCR
    • Lean NOx Trap (LNT), NOx Adsorber Catalyst (NAC also NAK), and NOx Storage Reduction (NSR)
    • Selective Catalytic Reduction (SCR) using urea reductant
    • Derivatives: Ammonium Carbamate, Combination LNT/SCR
  • Urea SCR Technology
    • Chemical reactions
    • Advantages/Disadvantages of the urea SCR system
    • Notable demonstration
  • Components of the Urea SCR System
    • Catalyst -- Extruded substrate; Coated substrate
    • Catalyst Type -- Vanadia/Titania/Tungsten; Iron Zeolite; Copper Zeolite
    • Catalyst volume and space velocity considerations
    • Urea injection system -- Air-Assist systems; Airless systems
    • NOx sensors
    • Urea specifications and suppliers
  • System Calibration and Control Considerations
    • Effect of NH3/NO
    • Effect of NO2/NO
    • Ammonia slip
    • Exhaust architecture
  • Regulatory and Market Considerations
    • Urea Infrastructure -- Bottles; Dispensers; Co-Fueling
    • End-user and urea refills
    • The Japanese experience
    • The European experience
    • Plans for USA manufacturers
    • Commercial vehicle market projections
  • Urea Production and Distribution
    • The A.D. Little Report
    • The European experience
    • Passenger car diesel emission regulations
    • Light-Truck diesel emission regulations
  • SCR Options and Configurations for Future NOx Limits
    • On-Highway heavy-duty diesels
    • Non-Road diesel engines
    • Passenger car diesels
    • Light-Truck diesels
    • Cold weather operation
  • Closing and Evaluations
Magdi Khair

Dr. Khair is a consultant at Magdiesel Technologies. He has recently retired from Watlow Electric where he was Chief Technologist in Watlow's Diesel Emission Space. He was previously an Institute Engineer at Southwest Research Institute. He had prior assignments at Allied Signal Automotive Catalyst, Ford New Holland, Ford Tractor Operations, Bendix Diesel Operations, and the Chrysler Corporation. He has worked with diesel engines and their emission control systems. Dr. Khair has an extensive background in diesel aftertreatment, stratified charge, and gas turbine engines since 1970. He was involved with developing emission control systems to help diesel and alternative combustion engines meet future regulated limits. He has co-authored Diesel Emissions and Their Control, a comprehensive textbook, and continues to present seminars in diesel engine technology, selective catalytic reduction for diesel engines, and exhaust gas recirculation.

Dr. Khair holds a B.S. in Automotive Engineering from Cairo, Egypt, a M.S. in Thermodynamics from the University of Birmingham, England, a MBA from Michigan State University USA, and a Ph.D. in Engineering Management from Warren National University. Dr. Khair holds 20 US patents in the areas of fuel injection, turbocharging, exhaust gas recirculation and filtration, and diesel aftertreatment systems.

Hotel & Travel Information

Fees: $1395.00
SAE Members: $1116.00 - $1256.00

1.3 CEUs
You must complete all course contact hours and successfully pass the learning assessment to obtain CEUs.

"This is a great course for any professionals working in the field of diesel emissions controls. The instructor, Mr. Magdi Khair, was very knowledgeable, and it was clear he spent much time updating the materials to make sure we got the latest information."
Ben Sharpe
International Council on Clean Transportation


"Mr. Magdi is very knowledgable in SCR for diesel engines. This course was eye opening for me in the aftertreatment technologies."
Charles Davis
Sr. Product Development Engineer
Navistar Inc.


For additional information, contact SAE Customer Service 1-877-606-7323 (724-776-4970 outside the U.S. and Canada) or at

Duration: 2 Days
Upcoming open enrollment dates being scheduled. Please check back.