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    Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NO<sub><i>x</i></sub> Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al<sub>2</sub>O<sub>3</sub> Catalyst

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    Atmospheric pressure nonthermal-plasma-activated catalysis for the removal of NO<sub><i>x</i></sub> using hydrocarbon selective catalytic reduction has been studied utilizing toluene and <i>n</i>-octane as the hydrocarbon reductant. When the plasma was combined with a Ag/Al<sub>2</sub>O<sub>3</sub> catalyst, a strong enhancement in activity was observed when compared with conventional thermal activation with high conversions of both NO<sub><i>x</i></sub> and hydrocarbons obtained at temperature ≤250 °C, where the silver catalyst is normally inactive. Importantly, even in the absence of an external heat source, significant activity was obtained. This low temperature activity provides the basis for applying nonthermal plasmas to activate emission control catalysts during cold start conditions, which remains an important issue for mobile and stationary applications
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