Gas-Phase Oxidative Dehydrogenation of Cyclohexanol over ETS-10 and Related Materials

The gas-phase oxidative dehydrogenation of cyclohexanol with air using ETS-10 and related materials is studied. At reaction temperatures below 200°C, ETS-10 was 100% selective to cyclohexanone and 75% cyclohexanol conversion was achieved. Catalyst deactivation was attributed to pore blockage. The catalyst is completely regenerated by calcination at 400°C. Cyclohexanol conversion increases with temperature and oxygen/cyclohexanol feed ratios. The introduction of Cr, Fe, K, or Cs in ETS-10 affects stability and decreases conversion and selectivity towards cyclohexanone. For comparison, some results on TS-1, zeolites NaX, and mordenite are also presented.