A Photocatalytic Active Adsorbent for Gas Cleaning in a Fixed Bed Reactor

Abstract EN

Efficient photocatalysis for gas cleaning purposes requires a large accessible, illuminated active surface in a simple and compact reactor.

Conventional concepts use powdered catalysts, which are nontransparent.

Hence a uniform distribution of light is difficult to be attained.

Our approach is based on a coarse granular, UV-A light transparent, and highly porous adsorbent that can be used in a simple fixed bed reactor.

A novel sol-gel process with rapid micro mixing is used to coat a porous silica substrate with TiO2-based nanoparticles.

The resulting material posses a high adsorption capacity and a photocatalytic activity under UV-A illumination (PCAA = photocatalytic active adsorbent).

Its photocatalytic performance was studied on the oxidation of trichloroethylene (TCE) in a fixed bed reactor setup in continuous and discontinuous operation modes.

Continuous operation resulted in a higher conversion rate due to less slip while discontinuous operation is superior for a total oxidation to CO2 due to a user-defined longer residence time.