Recent advances in low-temperature nitrogen oxide reduction: effects of electric field application

Abstract

This article presents a review of catalytic processes used at low temperatures to reduce emissions of nitrogen oxides (NO_x) and nitrous oxide (N₂O), which are exceedingly important in terms of their environmental impacts on the Earth. With conventional purification technologies, it has been difficult to remove these compounds under low-temperature conditions. By applying a catalytic process in an electric field for the three reactions of three-way catalysts (TWC), NO_x storage reduction catalysts (NSR), and direct decomposition of N₂O, we have achieved high catalytic activity even at low temperatures. By promoting ion migration on the catalyst surface, we have filled in the gaps in conventional catalytic technology and have opened the way to more efficient conversion of NO_x and N₂O.