Reflux method as a novel route for the synthesis of MoVTeNbOx catalysts for selective oxidation of propane to acrylic acid

Effect of Drying on the Synthesis and Characterizationc MoVTeNbOx Mixed Metal Oxide Catalysts Prepared by Reflux

“…There were two broad bands centered at 2θ = 9.5-10.5 and 27-28°C in the XRD patterns of MoVTeNbO precursors that are close to the reflections found for the crystalline Anderson-type compounds (NH 4 ) 6 (Fig. 2).…”

“…1). Solid V 2 O 5 followed by solid Te(OH) 6 were added to an ammonium heptamolybdate tetrahydrate (AHM) solution at 80°C. The MoVTe solution was cooled to room temperature.…”

“…It has the advantage of allowing intimate mixing of corresponding species in a homogeneous state at the solvent's boiling point and under atmospheric pressure. It is also possible to combine the advantages of both hydrothermal and slurry methods via reflux 6 . Through reflux, the sample can be left for a long period of time without adding more solvent for fear that the reaction vessel will boil dry as any vapour immediately condenses.…”

“…Under controlled conditions, this technique is useful for performing chemical reactions that require substantial time. Since reflux offers the possibility for observation and involvement, allowing interaction and more thorough inspection of the reaction medium, whose chemical and physical properties over the course of the reaction, so it could be a promising method to prepare this kind of catalyst 6 . Three different methods to remove water from the precursors have been used; spray drying, rotavap and oven drying.…”

ENHANCED REDUCIBILITY OF Mg-DOPED MoVTeNbOx MIXED OXIDE CATALYSTS FOR PROPANE OXIDATION REACTION

“…It has been reported that the oxidation of propane to acrylic acid requires surface and lattice oxygen to be selectively inserted into the intermediate to form final product. The present of weakly bonded oxygen will somehow assist in the C-C bond breakage that might lead to the formation of unwanted products such as acetic acid, CO and CO 2 [51].…”