Siloxane removal via silicate formation for lifetime extension of photocatalytic devices

摘要

A photocatalytic device for reacting with volatile organic compounds includes a photocatalyst and at least one additive, such as hafnium oxide and zirconium oxide, that is capable of forming a stable silicate with silicon dioxide. The additive reacts with volatile silicon-containing compounds to form stable silicate compounds. As a result, the silicon-containing compounds are unavailable for deactivation of the photocatalyst.

主权项

1. An air purification system comprising:
a substrate; a photocatalyst layer on the substrate, comprising photocatalytically active titanium dioxide particles; metal oxide additive particles capable of forming a stable silicate or solid solution with volatile silicon-containing compounds, said metal oxide additive particles including at least one of a hafnium oxide, a yttrium oxide, a tantalum oxide, a ytterbium oxide, and a scandium oxide, and disposed as islands on top of the photocatalyst layer or as an incomplete overlayer on the photocatalyst layer; and a UV source for illuminating the photocatalyst layer.