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

An aluminum composite and catalyst technology, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of low catalytic activity of catalyst, achieve improved catalytic activity, The effect of improving convective mass transfer efficiency and catalytic conversion efficiency

Pending Publication Date: 2019-11-12
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the defect that the existing catalysts used to catalyze the combustion of VOCs do not have a uniform and ordered pore structure, which leads to the low catalytic activity of the catalyst, thereby providing a cobalt-aluminum composite oxide catalyst preparation method, the cobalt-aluminum composite oxide catalyst prepared by the method has high catalytic activity, has a mesopore and macroporous hierarchical pore structure, has a large specific surface area, and a small cobalt-aluminum spinel grain size

Method used

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

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Embodiment 1

[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 ...

Embodiment 2

[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 ...

Embodiment 3

[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...

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Abstract

The invention relates to the technical field of catalyst preparation, and discloses a cobalt-aluminum composite oxide catalyst and a preparation method and application thereof. The preparation methodcomprises the steps that metal salt solutions of cobalt and aluminum are taken as precursors correspondingly, polymer microspheres are taken as a template agent, templates are soaked in the precursorsolutions, then impregnation and roasting are conducted, and thus the cobalt-aluminum composite oxide catalyst is obtained. A three-dimensional ordered hierarchical pore structure with a mesoporous and macroporous structure is created through the polymer microspheres, thus the specific surface area of the catalyst is increased, the prepared catalyst has a large transmission pore channel, reactantmodules enter the pore channel from all directions advantageously, the diffusion resistance is lowered, thus the convective mass transfer efficiency between gases is improved, and the catalytic activity of the cobalt-aluminum composite oxide catalyst is facilitated; and meanwhile, through the large transmission channel, the situation that the modules are blocked when reacting on the pore wall or the pore channel of the transmission channel, and consequently, the reaction progress is influenced can further be effectively avoided, and the catalytic conversion efficiency of the catalyst is improved.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a cobalt-aluminum composite oxide catalyst and a preparation method and application thereof. Background technique [0002] Volatile organic compounds, also referred to as VOCs (Volatile Organic Compounds), refer to volatile organic compounds with a boiling point below 260°C at normal pressure and a saturated vapor pressure above 70Pa at normal temperature, mainly including aldehydes, aromatic hydrocarbons and halogenated hydrocarbons Large categories, which generally exist in indoor and outdoor air. VOCs are very easy to generate photochemical smog under light conditions, causing greenhouse effect and ozone layer destruction, and their toxicity, carcinogenicity, teratogenicity and mutagenicity will have a significant impact on human health. At present, the treatment methods of VOCs include physical adsorption, chemical absorption, biodegradation, catalytic combustio...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/10F23G7/07
CPCB01J23/75B01J23/005F23G7/07F23G2209/14B01J35/393B01J35/23B01J35/399B01J35/613B01J35/651B01J35/615
Inventor 宛春生李达林江莉龙
Owner FUZHOU UNIVERSITY
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