• vox/c-al2o3 catalyst for oxidative dehydrogenation of ethane to ethylene: desorption kinetics and catalytic activity

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1087
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this study reports ethane oxidative dehydrogenation (odh) using lattice oxygen. ethane odh is studied under an oxygen-free atmosphere employing a 10 wt.% vox supported on c-al2o3. tpr and tpo show that the prepared 10 wt.% vox supported on c-alumina catalyst is a stable catalyst over repeated reduction and oxidation cycles. xrd shows the absence of v2o5 bulk surface species and a high dispersion of vox on the support surface. experiments are carried out in the crec fluidized bed riser simulator at 550–600 °c and pressures close to atmospheric conditions. reactivity tests show that the prepared odh catalyst displays 6.5–27.6% ethane conversion and 57.6–84.5% ethylene selectivity in the 550–600 °c range. metal–support interaction is assessed using ammonia tpd. this provides the desorption energy for both the bare c-al2o3support and for the vox/c-al2o3 catalyst. a slightly increased desorption energy is found when using the v-loaded catalyst. this shows low metal–support interactions and as a result, a well dispersed vox catalyst phase with high availability of lattice oxygen for odh. these findings are confirmed with xrd, showing no changes with respect to the xrd for the c-al2o3 alumina support. this proves that there are no other species formed due to the interaction between the vox surface species and the al2o3 support.

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