Aerobic oxidative dehydrogenation of N-heterocycles over OMS-2-based nanocomposite catalyst: preparation, characterization and kinetic study
OMS-2-based nanocomposite doped by sodium phosphowolframate was prepared for the first time and its remarkably enhanced catalytic activity and recyclability in aerobic oxidative dehydrogenation of N-heterocycles was examined in detail. Many tetrahydroquinoline derivatives and a broad range of other N-heterocycles could be tolerated by the catalytic system using biomass-derived solvent as reaction medium. Newly generated mixed crystal phases, noticeably enhanced surface area and labile lattice oxygen of OMS-2-based nanocomposite catalyst might contribute to the excellent catalytic performance. Moreover, kinetic study was extensively investigated and concluded that the dehydrogenation of 1,2,3,4-tetrahydroquinoline is a first-order reaction, and the apparent activation energy is 29.66 kJ•mol-1.