Table shows the main structural physico-chemical properties of the different TiO2 63 m 2 g -1 . Both TiO2(ALG) based catalysts exhibited a strongly higher surface area compared to both TiO2(SG) counterpart catalysts, and inversely had a much lower mean crystallite size of 9-11 nm vs. 20-24 nm. They also had a higher surface acidity of 430-478 µmol•g -1 vs. 80-128 µmol•g -1 . while total pore volume, average pore radius and average crystallites size were comparable.