Preparation method of ruthenium-base ammonia synthetic catalyst
A kind of ammonia synthesis and catalyst technology, which is applied in the field of preparation of high-activity new ammonia synthesis catalyst, can solve the problems of low activity and poor stability, achieve high activity, improve dispersion, and improve metal surface utilization
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Embodiment 1
[0029] 2g nano magnesium oxide and 0.21g RuCl 3 ·nH 2 O was added to 50ml of hexanediol solution, heated to 180°C in an oil bath, stirred for 1.5h, then immediately placed in an ice-water bath and stirred for 3h; stirred and evaporated to dryness at 160-250°C, and the organic solution was removed. The obtained solid powder was passed through hydrogen at 425°C for 12 hours to remove chloride ions. 0.15g KNO 3 Dissolve in about 20ml of hexanediol solution, put 1g of Ru / MgO into KNO 3 After impregnating in the hexanediol solution with stirring for 6 hours, evaporate to dryness with stirring at 160-250°C, and pass hydrogen gas through the obtained catalyst at 425°C for 3 hours to remove the remaining hexanediol. Take about 0.2 g of catalyst and place it in a reaction tube to measure its catalyst activity at a pressure of 0.2 MPa and a flow rate of 2100 ml / h. Catalyst KNO prepared by traditional method 3 -Ru / MgO-con was also prepared and evaluated under the same conditions. T...
Embodiment 2
[0032] 2.0g nano-magnesia and 0.21gRuCl 3 ·nH 2 O was added to 50ml of hexanediol solution, heated to 80°C in an oil bath, stirred for 2.5 hours, then immediately placed in an ice-water bath and stirred for 5 hours; stirred and evaporated to dryness at 160-250°C, and the organic solution was removed. The obtained solid powder was passed through hydrogen at 425°C for 12 hours to remove chloride ions. 0.15g KNO 3 Dissolve in about 20ml of hexanediol solution, put 1g of Ru / MgO into KNO 3 After impregnating in the hexanediol solution with stirring for 6 hours, stir and evaporate to dryness at 160-250° C., pass hydrogen gas through the obtained catalyst at 425° C. for 3 hours to remove the remaining hexanediol. Take about 0.2 g of catalyst and place it in a reaction tube to measure its catalyst activity at a pressure of 0.2 MPa and a flow rate of 2100 ml / h.
Embodiment 3
[0034] 2g nano magnesium oxide and 0.21g RuCl 3 ·nH 2O was added to 50ml of hexanediol solution, heated to 140°C in an oil bath, stirred for 0.5h, then immediately placed in an ice-water bath and stirred for 3h; stirred and evaporated to dryness at 160-250°C, and the organic solution was removed. The obtained solid powder was passed through hydrogen at 425°C for 12 hours to remove chloride ions. 0.15g KNO 3 Dissolve in about 20ml of hexanediol solution, put 1g of Ru / MgO into KNO 3 After impregnating in the hexanediol solution with stirring for 6 hours, evaporate to dryness with stirring at 160-250°C, and pass hydrogen gas through the obtained catalyst at 425°C for 3 hours to remove the remaining hexanediol. Take about 0.2 g of catalyst and place it in a reaction tube to measure its catalyst activity at a pressure of 0.2 MPa and a flow rate of 2100 ml / h. The results are shown in Table 2. The results show that the catalytic activity is the highest when the reduction tempera...
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