There is continued focus on controlling the emissions of pollutants from engines around the world. The Three Way Catalyst (TWC) has been successfully removing carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) emissions from gasoline engines since the early 1970s. These catalysts operate under so-called stoichiometric conditions, in which there is a balance...
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http://www.jm-gem.com/2010/09/selective-catalytic-reduction-the-nox-removal-method-of-choice-from-passenger-cars-to-power-plants/