Photocatalytic Oxidation (PCO)
and Dry Hydrogen Peroxide (DHP)

  • Consists of a pure or doped metal oxide semiconductor material.
  • Most Common Photocatalyst is Ti02 (titanium dioxide).
  • Activated by a UV light source.
  • UV-A (400-315nm)
  • UV-C (280-200nm
  • UV-V (under 200nm) Ozone can be formed at UV-V wavelengths.
  • Light mediated, redox reaction of gases and biological particles absorbed on the surface.
  • Some units claim disinfection from gaseous hydrogen peroxide.
  • Possible by-products formed by incomplete oxidizing.
  • Some air cleaners using PCO remove harmful contaminants to levels below limits for reducing health risks set by recognized cognizant authorities.
  • Some are ineffective in reducing concentrations significantly; manufacturer data should be considered carefully.

More information can be gathered here https://www.ashrae.org/technical-resources/filtration-disinfection#uvc

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