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Diesel DeNOx Catalyst
New Argonne-Developed Catalyst Can Reduce NOx Emissions From Diesel Engines by 80–85%
Argonne National Laboratory
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Inventor Chris Marshall shows the new catalyst that could help remove nitrogen oxides from diesel engine exhaust while saving energy.
Argonne’s Sundar Krishnan (left), Steve Ciatti (center), and Chris Marshall (foreground, right) working with the equipment that will be used to engine-test the Cu-ZSM-5 catalyst.
The new catalyst was developed by coating a commercially available catalyst (the zeolite, copper-ZMS-5) with cerium oxide, which reduced the temperature at which the maximum conversion of NOx reduction takes place. Because this lower temperature is typical of the temperature of diesel exhaust, the new catalyst can achieve impressive NOx-to-nitrogen conversion rates using the heat supplied by the engine. The cerium oxide coating also improves the catalyst’s long-term stability and exhibits increased (rather than decreased) performance in the presence of water vapor, making it ideal for use in automotive/truck exhaust systems where water is always present.
Another important feature is that the catalyst system can be easily attached — or “retrofitted” —to existing diesel-powered vehicles in a simple process that would take the vehicle off the road for less than one day. Thus, the catalyst can be installed not only on the assembly line for new diesel vehicles, but on existing sources of NOx emissions as well. The fleet of 11 million diesel-powered vehicles on the road represents a sizable and ready market for the diesel DeNOx catalyst.Benefits
- Catalyst system uses on-board diesel fuel or #2 heating oil for regeneration; no additional fluids or complicated engineering controls are needed
- Easy-to-use system with a long lifetime (400,000 miles), and requires minimal space on the truck chassis
- Materials used to produce the catalyst are inexpensive and relatively nontoxic
- Performance of the system improves with the presence of water vapors
- Ultra-low sulfur diesel fuel actually extends the life of the catalyst technology
- Vehicles (diesel)
- Stationary and portable power
- Fossil fuel power plants
- Chemical plants
ID Number |
Title and Abstract | Primary Lab |
Date |
---|---|---|---|
![]() Patent 7,220,692 |
Catalyst for selective NO.sub.x reduction using hydrocarbons
A two phase catalyst is disclosed with one or more transition metals such as Cu, Co, Fe, Ag and Mo supported on a molecular sieve having a pore size not greater than 8 .ANG. along with a stabilizing oxide of one or more of the oxides of Zr, Mo, V, Nb or the rare earths coating the molecular sieve. A method of preparing the two phase catalyst and using same to remediate NO.sub.x in combustion gases is also described. |
Argonne National Laboratory | 05/22/2007
Issued |
Development Stage | Availability | Published | Last Updated |
---|---|---|---|
Development - Prototype units in testing | Available - This catalyst technology is licensed in some fields of use and available for license in the remaining fields. | 06/02/2010 | 03/25/2011 |