Oxidative dehydrogenation of ethane to ethylene in a system with circulating microspherical metal oxide oxygen carrier: 2. Ethylene production in a pilot unit with a riser reactor

Chemical looping beyond combustion – a perspective

“…Nonetheless, in a continuously operating riser reactor system, an ethane conversion of 12% at ethylene selectivities 490% was obtained with a mixed Mo-Te-V-Nb oxide supported on g-Al 2 O 3 when the contact time of ethane feed and redox catalysts was 1-2 s at 500-575 1C. 317 The same authors also showed that the performance of Mo-based redox catalysts is strongly affected by the support material (Al 2 O 3 , Ga 2 O 3 or Y 2 O 3 ), leading to an increased ethane conversion and ethylene selectivity with a decrease in the content of MoO 3 ; the best results were obtained with 5 wt% MoO 3 on alumina, giving 90% selectivity for ethylene at an ethane conversion of 30%. 318,319 Novotny et al 284 investigated the effect of impregnating MoO 3 onto an a-Fe 2 O 3 -based redox catalyst, which improved the oxygen storage capacity from 0.28 wt% to 0.62 wt%.…”

Recent Advances in Intensified Ethylene Production—A Review

“…In the 500–650 °C temperature range, steady cycles of 55–85% ethylene selectivities can be achieved but ethane conversions were relatively low (7–28%). Another research group from Russia also tested a wide range of Al 2 O 3 -supported VO x and MoO x catalysts and with other types of support materials (Ga 2 O 3 or Y 2 O 3 ) in a pulse reactor. ,− Promising results were obtained on MoO x /Al 2 O 3 , and an ethylene selectivity of 94.5% can be achieved at an ethane conversion of 66.5%. The oxygen capacity of this supported MoO x catalyst is relatively low (<0.4 wt %), and the ethylene yield decreased significantly after several pulses.…”