Cobalt-aluminum composite oxide catalyst and preparation method and application thereof

[0044] A preparation method of cobalt-aluminum composite oxide catalyst, comprising the steps of:

[0045] (1) Preparation of metal ion precursor solution: weigh 10.91g Co(NO 3 ) 2 ·6H 2 O and 4.69gAl(NO 3 ) 3 9H 2 O was dissolved in a mixed solution of 50 mL of water and ethanol (volume ratio of 1:1) to obtain a mixed solution with a total metal ion concentration of 1 mol / L (Co / Al=3);

[0046] (2) Catalyst preparation: Slowly add polystyrene nano-microspheres to the above mixed solution, let it stand for 6 hours, then filter the remaining solution with suction, dry the obtained solid in an oven at 80°C for 12 hours, and then place it Put it into a muffle furnace for calcination, the heating rate is 1°C / min, and keep at 500°C for 2 hours to obtain a cobalt-aluminum composite oxide catalyst.

[0047] Carry out crystal phase test to above-mentioned catalyst with X-ray powder diffractometer, the result is as follows figure 1 shown by figure 1 It can be seen that the main ...

[0052] A preparation method of cobalt-aluminum composite oxide catalyst, comprising the steps of:

[0053] (1) Preparation of metal ion precursor solution: weigh 7.28g Co(NO 3 ) 2 ·6H 2 O and 9.38gAl(NO 3 ) 3 9H 2 O is dissolved in the mixed solution of 50mL water and ethanol (volume ratio is 1:1), obtains the mixed solution (Co / Al=1) that total metal ion concentration is 1mol / L;

[0054] (2) Catalyst preparation: Slowly add polystyrene nano-microspheres to the above mixed solution, let it stand for 6 hours, then filter the remaining solution with suction, dry the obtained solid in an oven at 80°C for 12 hours, and then place it Put it into a muffle furnace for calcination, the heating rate is 1°C / min, and keep at 500°C for 2 hours to obtain a cobalt-aluminum composite oxide catalyst.

[0055] The crystal phase of the catalyst was tested with an X-ray powder diffractometer, and the results showed that the main phase of the catalyst was spinel, and the average grain size ...

[0060] A preparation method of cobalt-aluminum composite oxide catalyst, comprising the steps of:

[0061] (1) Preparation of metal ion precursor solution: weigh 4.85g Co(NO 3 ) 2 ·6H 2 O and 12.50gAl(NO 3 ) 3 9H 2 O is dissolved in the mixed solution of 50mL water and ethanol (volume ratio is 1:1), obtains the mixed solution (Co / Al=0.5) that total metal ion concentration is 1mol / L;

[0062] (2) Catalyst preparation: Slowly add polystyrene nano-microspheres to the above mixed solution, let it stand for 6 hours, then filter the remaining solution with suction, dry the obtained solid in an oven at 80°C for 12 hours, and then place it Put it into a muffle furnace for calcination, the heating rate is 1°C / min, and keep at 500°C for 2 hours to obtain a cobalt-aluminum composite oxide catalyst.

[0063] The crystal phase of the catalyst was tested with an X-ray powder diffractometer, and the results showed that the main phase of the catalyst was spinel, and the average grain si...