Photocatalytic CO2 Reduction in Gas-Solid Regime in the Presence of Bare, SiO2udSupported or Cu-Loaded TiO2 Samples

摘要

Both commercial and home prepared (HP) TiO2 samples have been tested for the photocatalytic reduction of CO2. (HP) TiO2udpowders were prepared by using TiCl4 or Ti(OC4H9)4 as the precursors to obtain HP1 and HP2 samples, respectively. Also HP Cu-loadedudand SiO2 supported TiO2 powders were prepared. The HP samples were more active than the commercial ones for the photoreduction ofudCO2 with and without water vapour. HP1 produced mainly formaldehyde, HP2 principally methane. Acetaldehyde was found to be theudprimary product obtained when HP1 was supported on SiO2. The addition of Cu increased the photocatalytic reactivity either of bulk andudSiO2-supported HP1. In particular, 1 wt % of Cu improved the formaldehyde yield obtained with the bare HP1 by one order of magnitude.udDifferently, the presence of Cu or SiO2 in the HP2 samples markedly reduced the production of methane.