Process for preparing vanadium dioxide nano powder
A vanadium dioxide nanometer and powder material technology, applied in vanadium oxide and other directions, can solve the problems of adverse effects on the environment and operator's health, difficult process control, high heating furnace power, etc., and achieves less equipment investment and obvious phase change. Features, the effect of small power requirements
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Embodiment 2
[0059] Embodiment 2: Preparation of Mo-doped vanadium dioxide nanopowder material
[0060] The first group: choose industrial grade V 2 o 5 , V 2 o 5 with MoO 3 The formula is calculated by weight percentage: V 2 o 5 99%, MoO 3 1%; V 2 o 5 The weight ratio with oxalic acid is 1:1.
[0061] (1) Preparation of precursor
[0062] The above ratio of V 2 o 5 with MoO 3 Mix well and place in a container. , heated to 800°C under normal pressure to become a molten state, then pour the melt into a reaction vessel equipped with water and stir (the amount of water added is such that V 2 o 5 with MoO 3 melt), then add metered oxalic acid to the above solution and continue to stir until the reduction reaction is completed (about 3 hours). After the reduction reaction is completed, a blue liquid without precipitation is obtained. The solid precursor of vanadyl oxalate doped with Mo ions was obtained by evaporating to dryness at ℃.
[0063] (2) Thermal decomposition of pr...
Embodiment 3
[0087] Embodiment 3: Preparation of W-doped vanadium dioxide nanopowder material
[0088] The first group: choose industrial grade V 2 o 5 , V 2 o 5 with N 5 h 37 W 6 o 24 The formula is calculated by weight percentage: V 2 o 5 99%, N 5 h 37 W 6 o 24 1%; V 2 o 5 The weight ratio with oxalic acid is 1:1
[0089] (1) Preparation of precursor
[0090] The ratio of V 2 o 5 , oxalic acid, N 5 h 37 W 6 o 24 and V 2 o 5 Put polyethylene glycol with 2% of the total weight of oxalic acid into a reaction vessel, add water and stir at normal pressure and 40°C for about 3 hours to complete the reduction reaction. After the reaction was completed, a blue liquid without precipitation was obtained, and the obtained solution was evaporated to dryness at 80° C. to obtain a solid vanadyl oxalate precursor doped with W ions.
[0091] (2) Thermal decomposition of precursors
[0092] Put the obtained vanadyl oxalate precursor into a tubular heating furnace after pulveri...
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