Fresh acidic-Al2O3, basic-Al2O3 and neutral-Al2O3 support exhibit peaks at 2_ angle of 37.0◦, 39.0◦, 42.0◦, 47.0◦ and 66.7◦ correspond to _-phase. In all the three 20% CaO/Al2O3 catalysts XRD patterns were pronounced at similar 2_ angles due to Al2O3.