“…Nitrogen oxides (NO x ), originating from coal-red ue gas emission, are the new and focused objects of governance in China, and are associated with acid deposition, photochemical smog and ozone depletion. 1,2 Development of effective methods to control nitric oxide (NO) emission has been proposed as a prospective research area because NO is the main source of NO x . Current popular techniques for NO x removal are selective catalytic reduction (SCR) 3,4 and NO x storage and reduction (NSR), 5,6 which both convert NO x into N 2 .…”