In-plasma-catalysis for NO degradation by Ti self-doped TiO /γ-AlO catalyst and nonthermal plasma.

In an attempt to realize the efficient treatment of NO , a mixed catalyst of Ti self-doped TiO and γ-AlO was constructed by reducing commercial TiO. The degradation effect on NO was evaluated by introducing the mixed catalyst into a coaxial dual-dielectric barrier reactor. It was found that the synthesized TiO could achieve considerable degradation effects (84.84%, SIE = 401.27 J L) in a plasma catalytic system under oxygen-rich conditions, which were better than those of TiO (73.99%) or a single plasma degradation process (26.00%). The presence of Ti and oxygen vacancies in TiO resulted in a relatively narrow band gap, which contributed to catalyzing deeply the oxidation of NO to NO and NO during the plasma-induced "pseudo-photocatalysis" process. Meanwhile, the TiO showed an improved discharge current and promoted discharge efficiency, explaining its significant activation effect in the reaction. Reduced TiO could achieve an impressive degradation effect in a long-time plasma-catalysis process, and still maintained its intrinsic crystal structure and morphology. This work provides a facile synthesis procedure for preparing Ti self-doped TiO with practical and scalable production potential; moreover, the novel combination with plasma also provides new insights into the low-temperature degradation of NO .