Catalyst for synthesizing 2-cyano pyrazine and preparation method of catalyst
A cyanopyrazine and a catalyst technology are applied to the catalyst for synthesizing 2-cyanopyrazine and the field of preparation thereof, and can solve the problems of difficult application, poor thermal stability, phase structure change and the like, and achieve improved selectivity and yield, The effect of improving catalyst activity and good use effect
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Embodiment 1
[0033] 20g V 2 o 5React with 300mL isobutanol at 109°C for 3h, then add 95% pyrophosphoric acid to the system to make P:V=1.1, and react at 109°C for 12h after the addition, after the reaction is completed, naturally cool to room temperature, and reduce the reactant Pressure filtration with a vacuum of 0.05 MPa. The filter cake is then washed with isobutanol to remove soluble impurities from the solid surface. Substance A was obtained after washing and drying at 110°C for 12 hours.
[0034] Substance A was calcined in an oxygen atmosphere, the temperature was raised from room temperature to 650 °C at a rate of 5 °C / min, calcined for 4 hours, and cooled to room temperature to obtain Substance B.
[0035] The ammonium molybdate salt solution with a mass fraction of 10% was prepared by using ammonium molybdate, and the pH of the solution was controlled to be 1 by using nitric acid. Add 10g of substance B into 25g of the above solution to fully impregnate, impregnate for 3 hou...
Embodiment 2
[0038] 20g V 2 o 5 React with 160mL of isobutanol at 80°C for 5h, then add 95% pyrophosphoric acid to the system to make P:V=0.8, and react at 80°C for 5h after adding, after the reaction is completed, naturally cool to room temperature, and reduce the reactant Pressure filtration, the vacuum degree is 0.01MPa. The filter cake is then washed with isobutanol to remove soluble impurities from the solid surface. Substance A was obtained after washing and drying at 100°C for 12 hours.
[0039] Substance A was calcined in an oxygen atmosphere, the temperature was raised from room temperature to 500 °C at a rate of 5 °C / min, calcined for 6 hours, and cooled to room temperature to obtain Substance B.
[0040] The ammonium molybdate salt solution with a mass fraction of 5% was prepared by using ammonium molybdate, and the pH of the solution was controlled to be 3 by using nitric acid. Add 10g of substance B into 10g of the above solution to fully impregnate, impregnate for 3 hours...
Embodiment 3
[0042] 20g V 2 o 5 React with 500mL of isobutanol at 200°C for 3h, then add 95% pyrophosphoric acid to the system to make P:V=1.5, and react at 200°C for 10h after adding, after the reaction is completed, naturally cool to room temperature, and reduce the reactant Pressure filtration, the vacuum degree is 0.09MPa. The filter cake is then washed with isobutanol to remove soluble impurities from the solid surface. Substance A was obtained after washing and drying at 120°C for 10 hours.
[0043] Substance A was calcined in an oxygen atmosphere, the temperature was raised from room temperature to 700 °C at a rate of 5 °C / min, calcined for 3 hours, and cooled to room temperature to obtain Substance B.
[0044] The ammonium molybdate salt solution with a mass fraction of 15% was prepared by using ammonium molybdate, and the pH of the solution was controlled to be 2 by using nitric acid. Add 10g of substance B to 40g of the above solution to fully impregnate, impregnate for 3 hou...
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