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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http://www.jm-gem.com/2011/05/advanced-catalysts-for-combined-nac-scr-emission-control-systems/