Removal of NO Using a Dielectric Barrier Discharge Reactor in a Cycled Adsorption–Desorption and Decomposition System.

Removal of nitrogen oxides (NOx) from a cycled adsorption-desorption and decomposition system was studied at ambient temperature, which allows low concentration and high flow rate emissions. This system exhibited excellent recyclability and showed high performance through repeated cycling, with 85.4% NO conversion after eight cycles. Different metal oxide supports on activated carbon were used to remove NO by nonthermal plasma assisted catalytic adsorption-decomposition. The Cu/AC showed a large adsorption capacity, and copper ions increased the decomposition of NO, resulting in high energy efficiency. FTIR and TPD results showed that NO adsorption on the catalyst surface states is mainly as nitrate. The textural characteristics of catalysts for cyclic operation were investigated, and the catalytic activity relied on O atoms, Cu atoms and Cu2+ on the catalyst surface. The discharge voltages and several frequencies of the electric source were also investigated. As injection power energy increased, the reactor plasma chemical reaction process was increased. [ABSTRACT FROM AUTHOR]