Although it is not possible to compare directly the samples due to the different origins of the acidity and the associated strength, relationship can be drawn for the catalysts prepared via classical impregnation on high surface area anatase titania, namely the Ni/TiO2(PC500) series (Fig. ). The acidity is the highest for the catalyst reduced at the lower temperature (500°C), what was also associated to the highest availability of the anatase titania, so that -similarly to its Ni-based alginate-derived counterpart -the reaction proceeds to 5-MF. The reductive treatment at higher temperature is causing the decrease of acidity, although here in a much more pronounced manner. The appearance of the rutile phase was only effective at 700°C, where the strong drop in acidity pushed the selectivity to BHMF.