CO₂-assisted ethane oxidative dehydrogenation over MoO_x catalysts supported on reducible CeO₂–TiO₂

Abstract

Supported MoOx on mixed CeO2-TiO2 were investigated for the oxidative dehydrogenation of ethane (ODHE) using CO2 as a mild oxidant. Raman spectroscopic characterization of the synthesized catalysts under dehydrated conditions...

Light olefin synthesis from a diversity of renewable and fossil feedstocks: state-of the-art and outlook

“…149 Another important function of CO 2 is re-oxidation of the reduced active phase. Such phenomenon was observed in the systems with reducible oxides, for example, MoO x , 166 Pd/CeZrAlO x , 167 Ga 2 O 3 . 168 This process occurs in the case of the one-stage “looping-like” ODH, when alkane is directly oxidized by lattice oxygen resulting in the olefin and water production, after which the reduced metal species are re-oxidized by CO 2 .…”

Ternary platinum–cobalt–indium nanoalloy on ceria as a highly efficient catalyst for the oxidative dehydrogenation of propane using CO2

“…13), indicating that a large part of hydrogen derived from C3H8 was consumed by reverse water-gas shift reaction. This also suggests that the contribution of DDP versus CO2-ODP to the overall C3H6 production, which is reflected roughly by the H2 yield/C3H6 yield ratio, 35 was considerably low (~10%). Considering that H2 can also be formed by dry reforming to a small extent, the actual contribution of DDP should be much lower than 10%.…”

Propane oxidative dehydrogenation using CO2 over CrOx/Fe–CeO2 catalysts

“…49,50 However, it is worth mentioning that the effect of CO 2 on the overall propane conversion and propylene formation depends on multiple factors that may include the nature of active sites present which in turn may govern the relative contribution of simultaneous reactions such as DH vs. reforming 51 and/or DH/ ODH. 52 Moreover, CO 2 may participate directly in reoxidizing reduced metal oxide centers; thus, its conversion competes with the reverse water gas shift reaction.…”