Sulfated TiO(2)-P25 (Degussa titania) has been prepared by sol-gel method using H(2)SO(4) and characterized by FT-IR, XRD, FE-SEM, EDS, HR-TEM, XPS, DRS and BET surface area measurements. Sulfate loading by H(2)SO(4) increases the Lewis acidity of Degussa tiatania. This catalyst gives an excellent yield with less reaction time and is an inexpensive and easily recyclable solid acid catalyst for the synthesis of quinaxalines, dipyridophenazines and chalcones under microwave irradiation. (C) 2011 Elsevier B.V. All rights reserved.