One for decomposing n 2 Efficient catalyst for o and its preparation method and application
A catalyst and high-efficiency technology, applied in physical/chemical process catalysts, separation methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of limited development and high catalyst cost, and achieve recovery of catalytic activity and high activity. , the effect of good catalytic activity
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Embodiment 1
[0039] Preparation of immobilized CoO / MgAl 2 o 4 / Al 2 o 3 catalyst:
[0040] A. will Co(NO 3 ) 2 , Mg(NO 3 ) 2 , Al(NO 3 ) 3 Dissolve in deionized water at a molar ratio of 2:1:1 to obtain a solution with a total concentration of 0.3M, and mix urea with NO in the solution 3 - The molar ratio of 4:1 was added to the solution and dissolved until the solution became transparent.
[0041] B. Adding γ-Al 2 o 3 The carrier is activated and washed with a NaOH solution with a mass concentration of 3%, immersed in the solution obtained in step A, sealed in a hydrothermal reaction kettle, taken out after in-situ growth at 90°C for 48h, filtered and washed with water, and dried at 100°C for 24h. A catalyst precursor is obtained.
[0042] C. Put the catalyst precursor prepared in step B into a muffle furnace, heat and roast from room temperature at a heating rate of 10°C / min, heat up to 700°C for 3 hours, and take out the roasted product after cooling to room temperature wi...
Embodiment 2
[0045] Preparation of immobilized MgO / ZnAl 2 o 4 / Al 2 o 3 catalyst:
[0046] (1) Zn(NO 3 ) 2 , Mg(NO 3 ) 2 , Al(NO 3 ) 3 Dissolve in deionized water at a molar ratio of 3:1:1 to obtain a solution with a total concentration of 0.2M, and mix hexamethylenetetramine with NO in the solution 3 - The molar ratio of 3:1 was added to the solution and dissolved until the solution became transparent.
[0047] (2) Add γ-Al 2 o 3 Carrier with a mass concentration of 5% (NH 4 ) 2 SO 4 The solution was activated and washed, immersed in the solution obtained in step A, sealed in a hydrothermal reaction vessel, taken out after in-situ growth at 90°C for 72h, filtered and washed with water, and dried at 100°C for 12h to obtain a catalyst precursor.
[0048] (3) Put the catalyst precursor prepared in step B into a muffle furnace, heat and roast from room temperature at a heating rate of 5°C / min, heat up to 600°C for 5h, and take out the roasted product after cooling to room temp...
Embodiment 3
[0051] Preparation of solid-supported CuO / ZnAl 2 o 4 / Al 2 o 3 catalyst:
[0052] (1) Adding Cu(NO 3 ) 2 , Zn(NO 3 ) 2 , Al(NO 3 ) 3 Dissolve in deionized water at a molar ratio of 0.5:0.5:1 to obtain a solution with a total concentration of 0.1M. Combine urea with NO 3 The molar ratio of 5:1 was added to the solution and dissolved until the solution became transparent.
[0053] (2) Activate and wash the gamma-Al2O3 carrier with a 1% NaOH solution, immerse it in the solution obtained in step A, seal it in a hydrothermal reaction kettle, take it out after growing in situ at 120°C for 60h, filter and wash it with water, and Dry at 90° C. for 10 h to obtain a catalyst precursor.
[0054] (3) Put the catalyst precursor prepared in step B into a muffle furnace, heat and roast from room temperature at a heating rate of 10°C / min, heat up to 500°C for 2 hours, and take out the roasted product after cooling to room temperature with the furnace to obtain Immobilized CuO / ZnA...
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