Determination of highly active and selective surface for the oxidative dehydrogenation of ethane over phase-pure M1 MoVNbTeOx catalyst

Synthesis and Characterization of Bronze-Type Mixed Oxides for the Selective Activation of Hydrocarbons

“…Subsequently, it was shown that the use of a different synthesis method such as precipitation [238], gave similar selectivity to ethylene, although the catalytic activity could vary depending on the synthesis method. In fact, as stated in Section 1.4.2, these M1 phase materials can be prepared through different synthetic routes (typically hydrothermally, slurry, reflux or spray drying) and with different chemical compositions methods [178,[183][184][185][186][187][188][189], as well as several modifications such as the addition of dopants, diluters/promoters or post treatment methods [191][192][193][194][195][196][197][198][199]. However, none of these have meant a significant increase in the selectivity to ethylene (Table 1.…”

“…This is the case of H2O2 treatment [186], oxalic acid treatment [187], HNO3[188] or post-treatment water agitation [189a], as well as mechanical post-treatments [189b]. In general, these posttreatments seek to modulate the morphology of phase-pure M1 catalysts (promoting a specific increase of the catalyst surface area), in some cases by restraining the anisotropic growth of the basal (001) plane of the M1phase in calcination and decreasing the diameter of M1 needles[187,189].…”