Single-atom catalysts for nitrogen oxide emission control

Single-atom catalysts (SACs) have gained more and more attention due to their unique properties and behavior in the field of environmental catalysis. Recently, the number of reports on application of SACs in automobile and stationary emission control is growing. Especially, utilization of SACs in the removal of nitrogen oxides (NOx) has attracted many researchers. This review summarizes various SACs used in selective catalytic reduction (SCR) of NOx by NH3 (NH3–SCR), carbon monoxide (CO–SCR), hydrocarbons (HC–SCR), and H2 (H2–SCR). The challenges in application of SACs in the field of NOx emission control and suggestion for future research are also provided.