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Method for preparing hollow spherical nickel-based catalyst for catalytic pyrolysis of oil tar

A nickel-based catalyst, catalytic cracking technology, applied in physical/chemical process catalysts, chemical instruments and methods, tar processing by heat treatment, etc., can solve the problems of unstable catalyst carrier structure, reduced catalyst activity, loss of active components, etc. , to achieve the effect of easy operation, improved stability and strong surface penetration

Inactive Publication Date: 2011-09-14
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But ordinary γ-Al 2 o 3 The preparation of supported nickel-based catalysts requires the use of granular nano-alumina powder. Due to the limitation of the carrier, this type of catalyst has some shortcomings, mainly manifested in the instability of the catalyst carrier structure, the loss of active components and Carbon deposition is easy during sintering and reaction, resulting in reduced catalyst activity

Method used

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  • Method for preparing hollow spherical nickel-based catalyst for catalytic pyrolysis of oil tar
  • Method for preparing hollow spherical nickel-based catalyst for catalytic pyrolysis of oil tar
  • Method for preparing hollow spherical nickel-based catalyst for catalytic pyrolysis of oil tar

Examples

Experimental program
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Effect test

Embodiment 1

[0032] The preparation process and steps in this embodiment are as follows:

[0033] a. Dissolve 2 mmol of aluminum nitrate in an equal-volume mixed solution of 40 ml of water and acetone, add 0.5 mmol of sodium citrate morphology control agent under stirring, place in a hydrothermal kettle, and react at 200°C for 24 hours, Centrifuge, wash, dry the sample at 60°C, and heat-treat at 550°C to obtain the desired core-shell alumina carrier.

[0034] b. Configure 10ml of nickel nitrate solution with a concentration of 2.3%, and slowly add the γ-Al obtained in step a while stirring 2 o 3 Carrier 0.1g, continue to stir and impregnate for 12h, then dry by rotary evaporation, dry in a drying oven at 60°C for 12h, calcinate at 700°C for 100min, extrude the obtained catalyst, crush it, and sieve it, then reduce it with hydrogen at 500°C for 2h , the core-shell alumina-nickel-based catalyst material can be obtained.

[0035] The morphology of the product obtained in this example was c...

Embodiment 2

[0037] The preparation process and steps in this embodiment are as follows:

[0038] a. Dissolve 2 mmol of aluminum nitrate in 40 ml of equal-volume mixed solution of water and ethanol, add 0.5 mmol of sodium citrate morphology control agent under stirring, place in a hydrothermal kettle, and react at 200°C for 24 hours, Centrifuge, wash, dry the sample at 60°C, and heat-treat at 350°C to obtain the desired hollow spherical alumina carrier.

[0039] b. Configure 10ml of nickel nitrate solution with a concentration of 5%, and slowly add the γ-Al obtained in step a while stirring 2 o 3 Carrier 0.1g, continue to stir and impregnate for 12h, then dry by rotary evaporation, dry in a drying oven at 60°C for 12h, calcinate at 550°C for 100min, extrude the obtained catalyst, crush it, and sieve it, then reduce it with hydrogen at 600°C for 2h , the core-shell alumina-nickel-based catalyst material can be obtained.

[0040] The product obtained in this example is dispersed in absolu...

Embodiment 3

[0042] Concrete steps in the present embodiment are as follows:

[0043] a. Dissolve 2 mmol of aluminum nitrate in an equal volume mixed solution of 40 ml of water and glycerin, add 0.5 mmol of sodium citrate morphology control agent under stirring, place in a hydrothermal kettle, and react at 200°C for 24 hours, Centrifuge, wash, dry the sample at 60°C, and heat-treat at 550°C to obtain the desired hollow spherical alumina carrier.

[0044] b. Configure 10ml of nickel nitrate solution with a concentration of 0.2%, and slowly add the γ-Al obtained in step a while stirring 2 o 3 Carrier 0.1g, continue to stir and impregnate for 12h, then dry by rotary evaporation, dry in a drying oven at 60°C for 12h, calcinate at 230°C for 100min, and calcinate at 350°C for 100min, extrude the obtained catalyst, crush it, and sieve it at 700°C The core-shell alumina-nickel-based catalyst material can be obtained by hydrogen reduction at ℃ for 2 hours.

[0045] The product obtained in this e...

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Abstract

The invention relates to a method for preparing a hollow spherical nickel-based catalyst for catalytic pyrolysis of oil tar and belongs to the technical field of catalyst preparation processes. In the invention, a core-shell or hollow spherical gamma-Al2O3 carrier with a specific surface area up to 285 to 443m<2> / g is prepared by a hydrothermal process, and a NiO active component is loaded by a residue leaching method. The catalyst comprises 5 to 15 weight percent of NiO and the balance of gamma-Al2O3. The catalyst prepared by the method is used for catalyzing the oil tar cracking reaction using methylbenzene as a model, and has high reaction activity, high-temperature stability and carbon deposit resistance.

Description

[0001] technical field [0002] The invention relates to a method for preparing a hollow spherical nickel-based catalyst used for catalytic cracking of tar, belonging to the technical field of catalyst preparation technology. Background technique [0003] Coke oven gas is a by-product in the coke production process, the main component is H 2 and CH 4 , can be used for fuel, power generation, chemical raw materials, hydrogen production, etc. The high-temperature coke oven gas (raw gas or raw gas) discharged from the coke oven has a temperature of about 800-850°C and contains about 30% of tar components such as benzene and naphthalene. During transportation, it is easy to condense and block downstream pipelines and corrode equipment. Judging from the current technology of removing condensable organic matter, the catalytic cracking method makes full use of the physical sensible heat and chemical energy of the coke oven gas itself, and directly cracks or reforms the tar compo...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/08C10C1/19
Inventor 张良苗岳宝华韩玲张浩申杉杉陆文聪
Owner SHANGHAI UNIV
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