Phase-pure M1 MoVNbTeO x catalysts with tunable particle size for oxidative dehydrogenation of ethane

Effects of Lattice O Atom Coordination and Pore Confinement on Selectivity Limitations for Ethane Oxidative Dehydrogenation Catalyzed by Vanadium-Oxo Species

“…Electron microscopy and Rietveld refinement studies suggest that the occupation of the metal positions in the M1 crystal structure is somewhat variable and some heptagonal pores are occupied by metal cations. ,, The M1-phase crystallites can exhibit rod- or plate-like shapes with (001) planes containing exposed heptagonal pores on the ends but different types of planes exposed on the sides of the crystallites . While many studies propose (001) planes to be the most relevant to reactivity, ,, some correlations are observed between the shape and measured rates that are proposed to originate from the types of exposed facets . Some of these structural differences can indeed affect reactivity of the catalysts.…”

Phase-pure M1 MoVNbTeOx/TiO2nanocomposite catalysts: high catalytic performance for oxidative dehydrogenation of ethane

“…5,8,[21][22][23] For commercial implementation, the ODHE process should satisfy the following requirements: ethylene yield >70%, ethylene productivity >1.0 kg C 2 H 4 kg cat −1 h −1 , and long-term stability below 500 °C, 6 and most catalysts can only satisfy some of these requirements. There have been a number of attempts to enhance the catalytic performance of MoVNbTeO x catalysts in the ODHE process, for example by introducing cheaper additives and promoters, 8,18,24 such as α-Al 2 O 3 , Nb 2 O 5 , ZrO 2 , and SiO 2 as diluters, size control, 25 exposing more active (001) planes, 12 post-treatments, 26,27 doping other elements into the framework of the M1 phase, 11,13 and reactor design [28][29][30][31][32][33] (such as autothermal reactors, micro-channel reactors, membrane reactors, monolithic catalysts, cyclic reactors, etc. ).…”

“…The catalytic performances of phase-pure M1 and TiO can also be found in previous reports. 5,8,25,26 This dependence of ethylene selectivity on ethane conversion can be described by Scheme 1, a consecutive-parallel model for the ODHE process. 1,11,40 Furthermore, the influence of reaction temperature on the ODHE catalytic performance of the phase-pure M1 and M1/TiO 2 catalysts was also investigated, in which the introduction of TiO 2 also has a positive impact on the catalytic performance at different reaction temperatures (Fig.…”

Facile sub-/supercritical water synthesis of nanoflake MoVTeNbOx-mixed metal oxides without post-heat treatment and their catalytic performance

“…5b shows, six types of reduction peaks at 495 (I), 533-549 (II), 586-633 (III), 660-693 (IV), 703-733 (V) and 728 C (VI) are observed in the H 2 -TPR proles of samples. It is documented that the peak type I, II and III at low temperature originate from the reduction of metal cation (Mo 6+ , V 5+ and Te 4+ ) species in mixed metal oxides [54][55][56][57] while type IV can be attributed to the reduction of TeMoO x . 58 Moreover, the peak type V and VI at high temperatures are likely related to the monometallic oxide.…”