Various systems, devices, NO2 absorbents, NO2 scavengers and NO2 recuperatorfor generating nitric oxide aredisclosed herein. According to one embodiment, an apparatus for convertingnitrogen dioxide to nitric oxide can include a receptacleincluding an inlet, an outlet, a surface- active material coated with anaqueous solution of ascorbic acid and an absorbent whereinthe inlet is configured to receive a gas flow and fluidly communicate the gasflow to the outlet through the surface-active materialand the absorbent such that nitrogen dioxide in the gas flow is converted tonitric oxide.
