Supported Mo-VMgO catalyst, preparation method and applications thereof
A catalyst and supported technology, applied in the field of supported n-butane oxidative dehydrogenation catalysts, can solve problems such as easy deactivation, poor catalyst stability, and reduced olefin selectivity
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[0013] The invention discloses a supported Mo-VMgO catalyst and a preparation method thereof. The preparation method comprises the following steps:
[0014] (a) add ammonium metavanadate in the deionized aqueous solution of oxalic acid, stir reaction, then add ammonium molybdate and stir, make mixed solution i,
[0015] Wherein, as preferably, the molar ratio of oxalic acid and ammonium metavanadate is 4~1:1; The consumption of ammonium molybdate is that the molar ratio of Mo and V is 1:50~1, can be calculated;
[0016] Wherein the deionized aqueous solution of oxalic acid is prepared under the condition of slight heating and stirring, preferably prefabricated as a solution with a concentration of 0.138-0.184 g / ml;
[0017] (b) Add an appropriate amount of deionized water to the magnesium oxide, stir evenly, and make a paste mixture ii;
[0018] The magnesium oxide is preferably pre-calcined at 800-1500°C for 1-24 hours before use;
[0019] (c) Add the mixed solution i to th...
Embodiment 1
[0027] Preparation V 2 o 5 VMgO catalyst with a loading of 10%. A certain amount of magnesium oxide was weighed into an alumina crucible, and the crucible was placed in a high-temperature furnace for 3 h at 1000°C. Weigh 4.5 g of roasted magnesium oxide into a beaker, add 10 mL of deionized water and stir well. Weigh 1.38g of oxalic acid into another beaker, add 10mL of deionized water, and stir at 60°C until completely dissolved. Weigh 0.64g of ammonium metavanadate and slowly add in batches until complete reaction. The resulting solution was poured into magnesium oxide solution and mechanically stirred for 0.5h. The water was then evaporated to dryness while stirring while heating, and the obtained product was placed in an oven at 120° C. for overnight drying. Grind and granulate the obtained powder, pass through a 20-40 mesh sieve, and 2 Calcined at 600°C for 5h under protective gas. A 10% V-VMgO catalyst was obtained.
[0028] Catalyst performance test: The volume ...
Embodiment 2
[0033] Preparation V 2 o 5A Mo-VMgO catalyst with a loading of 10% and a molar ratio of Mo to V of 1:10 was added. A certain amount of magnesium oxide was weighed into an alumina crucible, and the crucible was placed in a high-temperature furnace for 3 h at 1300°C. Weigh 4.5 g of roasted magnesium oxide into a beaker, add 10 mL of deionized water and stir well. Weigh 1.38g of oxalic acid into another beaker, add 10mL of deionized water, and stir at 80°C until completely dissolved. Weigh 0.64g of ammonium metavanadate and slowly add in batches until complete reaction. Then weigh 0.09g of ammonium molybdate and add it into the above solution until it is completely dissolved. The resulting solution was poured into magnesium oxide solution and mechanically stirred for 2h. The water was then evaporated to dryness while stirring while heating, and the obtained product was placed in an oven at 120° C. for overnight drying. Grind and granulate the obtained powder, pass through a...
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