To illustrate the positive effect of the coating of the photocatalyst on the WLEs compared to the free photocatalyst particles in the reaction mixture, a fed-batch experiment of nitrobenzene reduction was carried out, this time using benzyl alcohol as solvent (Scheme 2). As higher nitrobenzene concentrations inhibit the photocatalytic reduction, either a CSTR-type or fed-batch are required to efficiently reach higher product concentration. The intermediate aniline was converted to imine (N-benzylidenaniline) with benzyl aldehyde (product from the oxidation of the benzyl alcohol used as solvent) in order to avoid inhibition of aniline on nitrobenzene conversion. However, the product imine is strongly colored. Additionally, over the course of the reaction, other strongly lightabsorbing compounds are formed as a side-products, presumably either by diazotization or aldoltype reactions from the intermediate aldehydes. These lead to reduced light uptake by the photocatalyst and thereby lowered reaction rates in prolonged experiments. Consequently, the coated WLE system should be advantageous in this case, bypassing the parasitic absorption and corresponding efficiency decrease.