Found this article in one of my OEM magazines. Personally I am not looking foward to the future emission standards.
Emissions: Government Warming - May 2007 Issue - (OEM Off-Highway)
In another decision of significance to the diesel industry, the EPA appears to have partially embraced the concept of Selective Catalyst Reduction (SCR) technology, which is expected to be a key strategy that engine and equipment manufacturers will employ to meet the next round of increasingly stringent emission standards.
With SCR technology, ammonia is injected into exhaust gases before it reaches a catalyst that then converts NOx emissions into harmless gasses. It can also significantly reduce hydrocarbon and particulate emissions. Unfortunately, the technology is difficult to adapt to the mobile market because of the equipment that is needed to make it work.
The primary concern is the storage tank for urea, an organic compound that can be converted to ammonia as needed. It takes about 1 gallon of urea to successfully treat 18 gallons of fuel, which means designers would have to make room for new storage tanks. EPA is also concerned that operators may neglect to fill the urea tanks, which would render the emission-reduction technology ineffective.
Tbar
Emissions: Government Warming - May 2007 Issue - (OEM Off-Highway)
In another decision of significance to the diesel industry, the EPA appears to have partially embraced the concept of Selective Catalyst Reduction (SCR) technology, which is expected to be a key strategy that engine and equipment manufacturers will employ to meet the next round of increasingly stringent emission standards.
With SCR technology, ammonia is injected into exhaust gases before it reaches a catalyst that then converts NOx emissions into harmless gasses. It can also significantly reduce hydrocarbon and particulate emissions. Unfortunately, the technology is difficult to adapt to the mobile market because of the equipment that is needed to make it work.
The primary concern is the storage tank for urea, an organic compound that can be converted to ammonia as needed. It takes about 1 gallon of urea to successfully treat 18 gallons of fuel, which means designers would have to make room for new storage tanks. EPA is also concerned that operators may neglect to fill the urea tanks, which would render the emission-reduction technology ineffective.
Tbar