New Multicomponent MoVSbNbCeO_x/SiO₂ Catalyst with Enhanced Catalytic Activity for Oxidative Dehydrogenation of Ethane to Ethylene

Abstract

In our study, we have obtained a multicomponent MoVSbNbCeOx/SiO2 catalyst with high catalytic activity for oxidative dehydrogenation of ethane (ODE) to ethylene. To date, multicomponent MoVTe(Sb)NbOx catalysts, which have been intensively studied during the last years, were found as very promising for the ODE to produce ethylene. It was generally agreed that the MoVTeNbOx catalyst was more efficient than MoVSbNbOx. The major drawback of using Te‐containing catalysts is the presence of environmentally harmful, toxic tellurium, and its volatility during the catalyst preparation and catalytic reaction conditions. In our work, the Mo1V0.24Sb0.23Nb0.08Ce0.01Ox/50 wt. % SiO2 catalyst was prepared via the spray‐dry method of aqueous solutions of the starting components, followed by heat‐treatment in He at 350 and 600 °C. For comparative purpose, one of the best Te‐containing catalysts Mo1V0.3Te0.23Nb0.12Ox was also tested in this reaction under the similar reaction conditions. A comparison of the catalytic properties of Sb− and Te− containing catalysts at the reaction temperature of 400–450 °C illustrates for both catalysts relatively high catalytic properties for ODE. The yield of ethylene of ca. 74 % was obtained for these catalysts, which exceeds the best yield reported in literature for Sb‐containing catalysts. The two main phases – M1 and M2 were revealed by XRD in the Sb‐containing catalyst. Intergrowth between the crystals of M1 and M2 phases with the formation of the interphase boundary in the highly active and selective Sb‐containing catalyst can be proposed from HRTEM results. The nature of the active state in this catalyst is discussed.

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

“…Undoubtedly, one of the main issues is how to design a catalyst with sufficient catalytic performance for ODHE. In the past few years, a variety of metal oxide-based catalysts have been used to study the catalytic process of ODHE reactions 4,5,[8][9][10][11][12][13][14][15][16][17] and multicomponent MoVNbTeO x catalysts have been extensively explored due to their unique merits in the ODHE process. 5,[8][9][10][11][12][13]18 MoVNbTeO x nanocrystalline multicomponent metal oxides typically composed of two phases (M1 and M2) and some minority phases may also exist depending on the preparation procedure.…”

Oxidation Catalysis of Crystalline Mo3VOx for the Selective Oxidation of Ethane

“…Ethylene is an important commodity chemical and is the most extensively manufactured petrochemical worldwide. − Recently, oxidative dehydrogenation of ethane (ODHE) has attracted considerable attention for ethylene production, and crystalline Mo–V–Te–Nb oxide (MoVTeNbO) is known as a state-of-art catalyst for this reaction. − MoVTeNbO consists of a network arrangement based on {NbMo 5 O 21 } 7– pentagonal unit (PU) and {MO 6 } octahedral (M = Mo, V), forming hexagonal and heptagonal channels in the crystal structure, where Te = O locates mainly in the former and partially in the latter (Figure a) . As the structural analogous with MoVTeNbO, we synthesized crystalline orthorhombic Mo 3 VO x (MoVO) .…”