The present work is focused on the improvement of an effective approach to tailor the acidity of silica alumina composite. SBA-15 was selected based on high surface area, uniform porosity and large mesopores. Modification of SBA-15 was performed to improve both Lewis and Bronsted acidities and hence catalyst activity. Therefore, introduction of alumina as a co-catalyst was carried out to enhance Lewis acid sites through its incorporation into the silica network. Evaporation impregnation method was evaluated for incorporation of aluminium to SBA-15 and materials with different SiO₂/Al₂O₃ ratios were prepared. Acidity and morphological features of the materials were assessed using XRD, EDX, SEM, TEM, N₂-physisorption, ²⁷Al MAS-NMR and FTIR with pyridine. Bronsted acidity was attained by the introduction of sulfonic acid groups in the final catalyst via the postsynthesis grafting method. Therefore, the balanced Lewis and Br phi nsted acidities and proper porosity of modified SBA-15 led to its efficient performance in the conversion of glucose as a biomass-based model component to levulinic acid.