Oxidation of multicarbon compounds to CO2 by photocatalysts with energy storage abilities

Abstract

Photocatalysts can be used for removal of harmful or odorous organic compounds, but only under illumination. We previously developed a TiO₂/Ni(OH)₂ photocatalyst with an oxidative energy storage ability, and used it for oxidation of monocarbon compounds such as methanol and formaldehyde to CO₂ by the stored energy. Here, we report that TiO₂/Ni(OH)₂ charged with oxidative energy can also oxidize multicarbon compounds such as acetaldehyde, acetic acid and acetone to CO₂ even in the dark. We also report that MnO_x can be used as an oxidative energy storage material if it is not in direct contact with the TiO₂ photocatalyst (e.g. TiO₂/nanoporous SiO₂/MnO_x). Photocatalytically charged MnO_x can also oxidize methanol, acetaldehyde, acetic acid and acetone to CO₂.