Establishment of Crystalline Complex Mo–V–Oxides as Selective Oxidation Catalysts

Abstract

Solid-state metal oxides with three-dimensional organization of catalytic components at nano-scale have high potential as catalysts for chemical conversion because the materials could provide unique reaction fields at catalytic active sites which are particularly important for multi-step catalytic reactions like selective oxidation. Here, crystalline Mo3VOx, a new type complex metal oxide catalyst, is introduced as a prominent example of solid-state metal oxides with three-dimensional organization. The material has a network arrangement of pentagonal units as a structure building block with the formation of 6-member ring channel and 7-member ring channel in its crystal structure. The material showed an outstanding catalytic performance for both selective oxidations of ethane to ethene and of acrolein to acrylic acid, revealing the importance of these structures for the catalytic oxidation activity. The outstanding catalytic performance for the reactions is ascribed to octahedra clusters isolated in the pentagonal unit network and to microporous property of the 7-member ring channel.

Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation

“…The hydrothermal synthesis of MnWO 4 was performed in an analytical autoclave HPM-PT-040 (Premex Reactor GmbH) described before, 15 adopting a synthesis method that has been reported previously. 16 In the rst step, a 0.2 M aqueous solution of Mn(NO 3 to a mixed solution of pH ¼ 6.7. Subsequently, the pH of the mixed solution was adjusted to 6.3, 8.0, 9.1, and 9.9 by adding appropriate amounts of 0.1 M HNO 3 (64-66%, Sigma Aldrich) or 0.1 M NaOH (98%, Alfa Aesar).…”

Thermal treatments of precursors of molybdenum and vanadium oxides and the formed Mo x V y O z phases active in the oxydehydration of glycerol

“…In the first step, glycerol is dehydrated to acrolein on acid sites [2][3][4][5][6][7][8][9][10][11][12][13]. The second step is the selective oxidation of acrolein to acrylic acid, catalyzed by redox sites [14][15][16][17][18][19][20][21][22][23][24]. The combination of these two reaction steps using a single bifunctional catalytic bed (the oxydehydration reaction) offers advantages including the ideal thermal balance provided by coupling the exothermic oxidation reaction with the endothermic dehydration reaction [2,25,26].…”

Desarrollo De Catalizadores Base Mo-v-Bi Para La Oxidación Parcial De Etano: Síntesis, Caracterización Y Evaluación Catalítica / Mo-v-Bi Base Catalizer Desarrollation for Ethane Partial Oxidation: Synthesis, Characterization and Evaluation Catalytics

“…El patrón de difracción antes descrito es típico de estructuras tipo bronce, e indica un arreglo de poliedros predominantemente en la dirección [001] para formar cristales tipo aguja. La composición química de la muestra Mo-V se determinó mediante EDS y concuerda con lo reportado en literatura para óxidos mixtos binarios [9][10][11][12], sin embargo, para las muestras promovidas con Bi, la determinación de la composición mediante EDS no es confiable debido al traslape de las curvas correspondientes a la energía de emisión más intensas del Mo y Bi son muy cercanas (2.29 y 2.52 KeV respectivamente) para discernir entre un elemento y otro, complicando la escena el hecho de que el Bi está en una concentración muy baja respecto al Mo.…”