A New Strategy for Plasma-Catalytic Reduction of No to N2 on the Surface of Modified Bi2moo6

Rational design of ingenious catalysts in plasma-catalysis system for NO reduction at room temperature in the presence of O 2 is a major challenge. In this work, amino (NH x ) groups and oxygen vacancies (OVs) decorated Bi 2 MoO 6 (NHO v -BMO) was designed to reduce NO to N 2 by density functional theory (DFT) in the first place. An “anchoring (NH 3 /N 2 plasma)-reduction (O 2 /N 2 plasma)” plasma-catalytic circular system was developed to simultaneously realize the construction of the special catalysts and then apply to NO elimination. Experimental results indicated that the adsorption and activation of NO x , the activation of catalysts in plasma, and the plasma discharge intensity were improved attributed to the NH 3 -­plasma modification process. NO was firstly oxidized to NO 2 by plasma, then NO 2 experienced part-disproportionation reactions during adsorption on OVs, producing NO, N 2 O, N 2 and nitrates. After activation of the catalysts, the adsorbed NO x was partly oxidized to nitrates by ·O 2 - on OVs sites via plasma motivated “pseudo photocatalysis”, then those adsorbed NO x , nitrates and the gaseous NO/NO 2 was further reduced to N 2 by NH x groups for NHO v -BMO. Possible reaction pathways and mechanisms were clarified. The special circular plasma-catalytic system for NO reduction and the way of theory guiding practice may inspire novel approaches toward the design of artful catalysts for targeted reactions