Abstract
Sulfur dioxide (SO 2 ) is one major air pollutant from burning the fossil fuels and its easier and more effective treatment can offer better protection of human health. Here, we demonstrate that the electrochemical double-cell (EDC) plate highly promotes the decomposition of SO 2 in simulated oxygen-rich exhausts to sulfur vapor and gaseous oxygen without consuming any reagent or other resource. SO 2 can be removed almost completely. Sulfur can be recovered as solid after cooling the sulfur vapor. The DeSO 2 rate increases with SO 2 concentration and also with O 2 concentration. Highest DeSO 2 rate occurs at around 170°C. A novel technology of promoted SO 2 decomposition (PSD) is thus established. The real-world applicability of PSD is confirmed by SO 2 removal from the boiler flue gas using the electro-catalytic honeycomb, which consists of numerous EDCs.