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The influence of metal composition and preparation pH on the properties and photoactivity of sol-gel synthesised Ce y Co x Ti 1-x O 3+δ  perovskite (0.05 ≤ x, y ≤ 0.20) has been investigated. Composite oxide samples were obtained following an orthogonal design plan and characterised using N 2  adsorption, XRD, NH 3 -TPD, UV-diffuse reflectance and FTIR spectroscopy. Photoactivity was evaluated based on the oxidative mineralization of phydroxybenzoic acid in an internally-radiated slurry reactor at 300 K. Statistical analysis revealed that increased Co content caused a significant reduction in band-gap energy although detrimental to BET surface area. The addition of Ce improved photoactivity and the trend appeared to be closely linked to the presence of stronger acid sites in these perovskite catalysts. Preparation pH, however, has only marginal effect on the physicochemical properties and a statistically negative effect on the photoactivity. Data were fitted to multi-linear regression models which were subsequently used to obtain optimum conditions for the preparation of the perovskite for each of the key performance indices with a Ce 0.05 Co 0.2 Ti  0.8 O 1.875  synthesised at pH=4 emerging as the optimum recipe for photoactivity.

Design of Ce y Co x Ti (1-x) O 3+δ Perovskite for Photocatalysis: A Statistical Study