GAS-PHASE SELECTIVE OXIDATION OF 2-CHLOROTOLUENE TO CHLORO-MALEIC ANHYDRIDE IN THE PRESENCE OF HETEROGENEOUS CATALYSTS Journal title: Azerbaijan Chemical Journal Authors: A.C. Efendi, E.M. Babayev, F.A. Yunisova, N.F. Aykan, B.A. İsmayilova Subject(s):