Posts Tagged ‘ NOx ’

Systems to reduce emissions of nitrogen oxides (NOx) from vehicles are now well established, generally based on single technologies, either selective catalytic reduction (SCR) or NOx adsorber catalysts (NACs). Global Emissions Management looks at work to combine the two to achieve even higher NOx conversions than each of the separate technologies.
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Johnson Matthey Emission Control Technologies continues its focus on R&D with the completion of a new technical centre at its Redwitz site in Germany. The new technical centre will aid the development of new products to control harmful emissions of nitrogen oxides (NOx) from vehicles and stationary sources such as power stations.
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The U.S. Environmental Protection Agency (EPA) has verified Johnson Matthey’s innovative SCRT® System as the first 4-way emission control technology for on-road vehicles.
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Copper zeolite SCR catalysts are being used to meet tighter NOx standards around the world. Global Emissions Management looks at work undertaken to improve their thermal stability by stabilising ammonia storage capacity. SAE paper 2009-01-0899, given at the 2009 SAE World Congress, describes the development of a new generation of SCR catalysts.
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Past issues of Global Emissions Management have looked at selective catalytic reduction and diesel particulate filter technologies. In this issue, we look at combining them in order to reduce overall catalyst volume in after treatment systems. This article is based on paper 2009-01-0910, presented at the SAE World Congress in April 2009.
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The key requirements for the next stages of European emissions limits for cars and light commercial vehicles were published as Regulation (EC) 715/2007 in June 2007 and the technical content was published in July 2008. The whole process started in December 2005 when the European Commission published a proposal for Euro 5. The Association...
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Meeting new emissions standards not only involves engine and aftertreatment developments, but also demands significant levels of testing to demonstrate compliance. Global Emissions Management looks at the testing required to ensure that cars will meet current and future limits.
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Net rhodium demand rose by 1.2% in 2006 to a record 837,000 troy ounces (oz), compared to 827,000 oz in 2005, driven largely by growth in the autocatalyst sector. At the same time, supplies onto the market increased by 9%, to 824,000 oz.The net effect is that the rhodium market was still in deficit...
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