Nickel/aluminum oxide catalyst microsphere and preparation method thereof

A catalyst and catalyst quality technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of reducing catalyst activity, influence, and improving catalyst strength, etc.

Inactive Publication Date: 2018-07-31
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the addition of silica sol reduces the activity of the catalyst, especially Ni / Al 2 o 3 Low-temperature methanation activity of the catalyst, and limited improvement of the strength of the catalyst

Method used

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  • Nickel/aluminum oxide catalyst microsphere and preparation method thereof
  • Nickel/aluminum oxide catalyst microsphere and preparation method thereof
  • Nickel/aluminum oxide catalyst microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) 596g Ni(NO 3 ) 2 ·6H 2 O, 96.4g Mg(NO 3 ) 2 ·6H 2 O and 641g Al(NO 3 ) 3 9H 2 O was dissolved in 2000mL of deionized water, and then 53g of tetraethyl silicate was added to obtain a mixed solution. NaOH solution was added to adjust the pH of the mixed solution to 11. precipitation reaction;

[0057] (2) After the co-precipitation reaction in step (1) is completed, continue to stir for 1 hour, then transfer the precipitate to a high-pressure reactor for hydrothermal reaction, the temperature of the hydrothermal reaction is 160°C, keep the reaction for 4 hours, and obtain the catalyst after the reaction is completed Precursor slurry;

[0058] (3) Use ionized water to wash the precursor slurry obtained in step (2) to neutrality, filter and dry at 100°C for 10 h, and then use a ball mill to pulverize it into a fine powder below 3 μm, and mix the obtained fine powder with deionized water Mixing and preparing a slurry with a solid content of 60wt.% in a high-spe...

Embodiment 2

[0061] (1) 238g Ni(NO 3 ) 2 ·6H 2 O, 211g Zr(NO 3 ) 4 ·5H 2 O and 801g Al(NO 3 ) 3 9H 2 O was dissolved in 2000mL of deionized water, and then 106g of tetraethyl silicate was added to obtain a mixed solution. Aqueous ammonia solution was added to adjust the pH of the mixed solution to 10. precipitation reaction;

[0062] (2) After the co-precipitation reaction in step (1) is completed, continue to stir for 1 h, then transfer the precipitate to a high-pressure reactor for hydrothermal reaction, the hydrothermal reaction temperature is 200 ° C, keep the reaction for 10 h, and obtain the catalyst after the reaction is completed Precursor slurry;

[0063] (3) Use ionized water to wash the precursor slurry obtained in step (2) to neutrality, filter and dry at 100°C for 10 h, and then use a ball mill to pulverize it into a fine powder below 3 μm, and mix the obtained fine powder with deionized water Mixing and preparing a slurry with a solid content of 50wt.% in a high-spe...

Embodiment 3

[0068] (1) 238g Ni(NO 3 ) 2 ·6H 2 O, 8g La(NO 3 ) 3 9H 2 O and 945g Al(NO 3 ) 3 9H 2 O was dissolved in 2000mL deionized water, and then 212g tetraethyl silicate was added to obtain a mixed solution, and Na 2 CO 3 The solution adjusts the pH of the mixed solution to 10, puts the mixed solution into a continuously stirred reaction kettle, and carries out coprecipitation reaction at 60°C;

[0069] (2) After the co-precipitation reaction in step (1) is completed, continue to stir for 1 hour, then transfer the precipitate to a high-pressure reactor for hydrothermal reaction, the temperature of the hydrothermal reaction is 220°C, keep the reaction for 24 hours, and obtain the catalyst after the reaction is completed Precursor slurry;

[0070] (3) Use ionized water to wash the precursor slurry obtained in step (2) to neutrality, filter and dry at 100°C for 10 h, and then use a ball mill to pulverize it into a fine powder below 3 μm, and mix the obtained fine powder with de...

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Abstract

The invention provides a nickel / aluminum oxide catalyst microsphere and a preparation method thereof. The method comprises the steps that a nickel source, an addition agent raw material and an aluminum source solution are mixed, then a sodium silicate or tetraethyl orthosilicate solution is added as a silicon source, a precipitant is added for adjusting the pH, and a coprecipitation reaction is conducted to obtain a precipitate; the precipitate is subjected to a hydrothermal reaction, and after the reaction is completed, the precipitate is washed and dried to obtain a catalyst precursor; the solid content of precursor slurry is adjusted, then spraying granulation is conducted, and after calcination, the Ni / Al2O3 catalyst microsphere is obtained. The Ni / Al2O3 catalyst microsphere with highwear resistance is obtained, abrasion and loss of a catalyst in the high-temperature high-pressure methanation process of a fluidized bed can be reduced, the production cost is lowered, the catalyticactivity and stability of the catalyst are improved at the same time, and the yield of methane is increased. The catalyst has the advantages that the treatment amount is high, the catalyst is quicklyformed, the reaction process is simple and easy to control, and the catalyst has good application prospects.

Description

technical field [0001] The invention relates to the technical field where catalysts intersect with inorganic synthesis chemistry, in particular to a nickel / alumina catalyst microsphere and a preparation method thereof. Background technique [0002] The synthesis gas methanation process is rapid and strong exothermic, the bed adiabatic temperature rises quickly, and the increase in operating temperature will easily reduce the product purity and cause catalyst deactivation. Therefore, the methanation catalyst is the two core technologies of the coal-to-synthetic natural gas process (reaction device and catalyst). At present, the industrialized methanation technology adopts adiabatic multi-stage fixed bed process and pelletized (porous) columnar catalyst, but the adiabatic multi-stage fixed bed methanation process only relies on gas flow to transfer the heat of methanation reaction. Due to the small heat capacity of gas, The process must adopt technical methods such as multi-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J35/02B01J35/08C07C1/04C07C9/04
CPCC07C1/0435B01J23/755B01J35/023B01J35/08C07C2523/755C07C9/04C07C2521/04C07C2521/06C07C2521/10C07C2521/08C07C2523/10C07C2523/83B01J21/04B01J21/005B01J23/005B01J21/12B01J23/02B01J37/0045B01J37/10B01J37/033B01J23/78B01J21/066B01J37/18B01J37/088
Inventor 刘娇崔佃淼许光文
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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