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Slurry bed carbon dioxide methanation bimetallic catalyst and preparation method and application thereof

A bimetallic catalyst, carbon dioxide technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of large particles, poor catalyst stability, and easy active components. shedding and other problems to achieve the effect of enhancing interaction, promoting dispersion and preventing agglomeration

Active Publication Date: 2016-06-01
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, cobalt-modified Ni / SiO prepared by impregnation method 2 Although the catalyst can increase the fixed bed CO of the catalyst 2 Methanation activity, but the catalyst prepared by this method still has some defects, such as weak interaction between the active component and the carrier, large particles and poor stability of the catalyst during long-term operation
For the strongly stirred slurry bed methanation reaction, when the interaction between the active component and the carrier is weak, the active component is easy to fall off, which reduces the stability of the catalyst

Method used

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  • Slurry bed carbon dioxide methanation bimetallic catalyst and preparation method and application thereof
  • Slurry bed carbon dioxide methanation bimetallic catalyst and preparation method and application thereof
  • Slurry bed carbon dioxide methanation bimetallic catalyst and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0024] After the mass of 4.1 parts of P123 was fully dissolved in 64 parts of absolute ethanol at room temperature, 14 parts of 65% nitric acid were added in the mass, and the pH value of the control solution was 2 3. Add 8.5 parts of aluminum sec-butoxide by mass to the above solution, and stir at room temperature until it is completely dissolved. Then, 1.8 parts of nickel acetate and 0.84 parts of cobalt nitrate were added and stirred at room temperature for 5 hours, then moved to an oven for drying at 60 °C for 48 hours, and then placed in a muffle furnace for 550 °C roasting for 6 hours, and the roasted samples were ground and granulated to 140 °C. 200 mesh, 500℃ in fixed bed, volume composition is 30%H 2 with 70%N 2 , under the condition of space velocity of 6000mL / (g·h) for 6h, the nickel methanide-based catalyst was obtained. The mass composition of each component of the catalyst is: active component Ni20wt.%, active component Co8wt.%, Al 2 O 3 72wt.%. The specif...

Embodiment 2

[0028] After fully dissolving 4.0 parts of P123 in quality in 64 parts of absolute ethanol at room temperature, add 14 parts of 65% nitric acid to it to control the pH value of the solution to 2 3. Then add 6 parts of aluminum isopropoxide into the above solution, and stir at room temperature until it is completely dissolved. Then add 3.15 parts of nickel nitrate and 0.45 parts of cobalt acetate and stir at room temperature for 6 hours, then move it into an oven and dry it at 60°C for 60 hours, then put it in a muffle furnace and bake it at 500°C for 8 hours, and grind and granulate the roasted sample to 100 140 mesh, in a fixed bed at 600°C, the volume composition is 40%H 2 with 60%N 2 , the space velocity was 4500mL / (g·h) and reduced for 4h to obtain the methanation nickel-based catalyst. The catalyst composition is: active component Ni30wt.%, active component Co5wt.%, Al 2 o 3 65wt.%. The specific surface area of ​​the prepared catalyst is 392m 2 / g, the pore volum...

Embodiment 3

[0031] After fully dissolving 3.9 parts of P123 in quality in 63 parts of absolute ethanol at room temperature, add 14 parts of 65% nitric acid to it to control the pH value of the solution to 2 3. Then add 6.15 parts of aluminum sec-butoxide into the above solution, and stir at room temperature until it is completely dissolved. Then add 3.7 parts of nickel acetylacetonate and 1.9 parts of cobalt acetylacetonate and stir at room temperature for 7 hours, then move it into an oven and dry it at 60°C for 50 hours, then put it in a muffle furnace and roast it at 650°C for 6 hours, and grind and granulate the roasted sample to 200 250 mesh, 650°C in a fixed bed, the volume composition is 60%H 2 with 40%N 2 , the space velocity was 3000mL / (g·h) and reduced for 4h to obtain the methanation nickel-based catalyst. The catalyst composition is: active component Ni40wt.%, active component Co2wt.%, Al 2 o 3 58wt.%. The prepared catalyst has a specific surface area of ​​352m 2 / g,...

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Abstract

The invention relates to a bimetallic catalyst applied to slurry bed carbon dioxide methanation, a preparation method of the bimetallic catalyst and application of the bimetallic catalyst in slurry bed carbon dioxide methanation. A regular-mesoporous nickel-cobalt bimetallic alumina catalyst is prepared in one step through an evaporation induced self-assembly method. The bimetallic catalyst is composed of, by mass, 20-60 wt.% of active component Ni, 0.1-8 wt.% of active component Co and 39-78 wt.% of alumina carrier, specific surface area of the prepared catalyst is 100-500 m<2> / g, pore volume is 0.2-1.0 cm<3> / g, and pore diameter is 5-15 nm. The bimetallic catalyst is simple in preparation process, the active components nickel and cobalt in the catalyst are dispersed on the carrier surface and in pores more uniformly, and interaction between the active components and the carrier is enhanced; when the catalyst is applied under reaction conditions of slurry bed carbon dioxide methanation, CO2 conversion rate can be up to 81.5%, CH4 selectivity can be up to 99.7% or above.

Description

technical field [0001] The invention relates to a bimetallic catalyst applied to the methanation of carbon dioxide in a slurry bed, and belongs to the technical fields of natural gas chemical industry and coal chemical industry. In addition, the present invention also relates to a preparation method of the bimetallic catalyst and its application in a slurry bed carbon dioxide methanation reaction. Background technique [0002] Methane is an important fuel and chemical intermediate. In recent years, with the rapid increase in the demand for natural gas in my country, the gap between the supply and demand of domestic natural gas resources has gradually increased. Converting coal into synthetic gas and producing synthetic natural gas through methanation is one of the important ways to alleviate the natural gas gap, and methanation technology is the key to this process. Coke oven gas is a mixed gas produced after coal dry distillation, which contains a relatively high hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J35/10C10L3/08
CPCC10L3/08B01J23/755B01J35/635B01J35/615B01J35/647
Inventor 孟凡会李忠李鑫高源
Owner TAIYUAN UNIV OF TECH
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