Oxidative Dehydrogenation of Ethane over NiO-loaded High Surface Area ZrO₂ Catalysts

Abstract

The oxidative dehydrogenation of ethane (ODHE) over POn/NiO/ZrO2 (High Surface area Zirconia: HSZ) catalyst was carried out with a fix-bed flow reactor at 450 under atmospheric pressure. The ODHE without dilution of reactants with inert gas resulted in ethane conversion of 32.1%, with a high ethene selectivity of 64.2% and an ethene yield of 20.6%. In addition, the catalytic activity did not decrease for at least 12 h. In XPS analysis, Ni species of NiO/HSZ catalyst after the reaction exhibited partly reduced metallic Ni. In contrast, in POn/NiO/ HSZ, Ni species exhibited mostly the NiO form after the reaction. It was found to be important for high ethane conversion and ethene selectivity, the Ni species not to be reduced to metallic Ni during the ODHE reaction. The addition of a small amount of POn to NiO/HSZ catalyst significantly contributed to the resistance to the facile reduction of NiO.

The effect of phosphorus on the catalytic performance of nickel oxide in ethane oxidative dehydrogenation

“…41,42 Finally, it should be noted that adding phosphorus to a high surface area zirconia-supported NiO catalyst increased both its catalytic activity and ethylene selectivity in ethane ODH. 30 The presence of phosphorus enabled the Ni species to remain in an oxidized state during the ODH reaction, i.e. it was not reduced to metallic Ni, as observed for the unpromoted catalyst.…”

Ni–Ta–O mixed oxide catalysts for the low temperature oxidative dehydrogenation of ethane to ethylene

“…NiO is known to be very reactive and capable of activating ethane at moderate temperature (below 400°C) [13,14]. Furthermore, the physical and chemical properties of NiO can be modified and improved by doping with transition metals, such as Nb [15][16][17][18][19][20], Zr [21,22], W [23], the main group element Sn [24] or by supporting it on SiO 2 , Al 2 O 3 , ZrO 2 , and MgO [25][26][27][28][29]. The resulting NiO based materials deliver increased ethylene yield.…”

The Oxidative Dehydrogenation of Propane over NiO–ZrO2 Catalyst

“…Takita et al have reported that Ni 2 P 2 O 7 exhibits high selectivity in the ODH of iso-butane to iso-butene [34]. We have found that PO x / NiO/ZrO 2 having a high surface area exhibits a high ethane conversion with high ethylene selectivity in the ODHE [35]. Runs 12-14 show the effects of additives to NiO-ZrO 2 (c) on the ODHP.…”