The catalytic converter (1) has a reactor body (2) with a photo-catalytic surface (3) and entry apertures (4) for light with photo-catalytic spectrum. The surface is at an acute angle (7) of between 1 degrees and 5 degrees relative to the light rays (6) entering through the apertures. The reactor body consists of blades (9) positioned offset relative to each other across the direction of incidence (10) of the light rays. The blades are of flat folded material.
