Abstract: A reactor unit for photocatalytic treatment of fluids such as air, includes a catalyzer device (4) comprising a catalytic material support having a generally tubular shape defining a fluid flow channel extending around and along a fluid flow path and a photocatalytic material coated on at least a portion of an internal surface of the support, and a radiation source (30) received in a central portion of the catalyzer device. The catalytic material support comprises a wall portion and a plurality of tapered protrusions (8) extending from an internal surface of the wall portion to a tip proximate to the radiation source, the tapered protrusions being arranged around the radiation source and along the fluid flow channel.

Abstract: A reactor unit for photocatalytic treatment of fluids such as air, includes a catalyser device (4) comprising a catalytic material support having a generally tubular shape defining a fluid flow channel extending around and along a fluid flow path and a photocatalytic material coated on at least a portion of an internal surface of the support, and a radiation source (30) received in a central portion of the catalyser device. The catalytic material support comprises a wall portion and a plurality of tapered protrusions (8) extending from an internal surface of the wall portion to a tip proximate to the radiation source, the tapered protrusions being arranged around the radiation source and along the fluid flow channel.

Abstract: A gel for cleaning and deodorizing air includes an organic binder with ultraviolet light permeable polymeric molecules and particles of inorganic semi-conductors. The gel includes acrylic molecules, a polar diluent and an ultraviolet light inert charge including particles of silica, of rutile cristalline form of titanium oxide and/or of clay.