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A kind of preparation method and application of nanometer nickel-based CO methanation catalyst

A methanation catalyst and nano-nickel technology, which is applied in the field of preparation of nano-nickel-based methanation catalysts, can solve the problems of reducing the utilization rate of active centers, hindering the mass transfer and diffusion of reactants, and being expensive, so as to achieve easy large-scale industrial production, Improved methanation performance and low cost

Active Publication Date: 2019-09-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, organics modified by organic surface functionalization are often expensive. When the core-shell structure is used, the active site is covered to reduce the utilization of the active center. At the same time, the existence of the core-shell structure will also hinder the mass transfer and diffusion of reactants.

Method used

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  • A kind of preparation method and application of nanometer nickel-based CO methanation catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 5 parts of nickel nitrate hexahydrate and 0.6 parts of zirconyl nitrate dihydrate in 65 parts of 60% aqueous solution of glycerol and start vigorous stirring at room temperature, then slowly add 5 parts of silica carrier to the solution , continue to stir and heat up to 70 ° C for ultrasonic treatment for 3 h, then move into a vacuum drying oven at 240 ° C for 6 h, then put the sample into a tube furnace and feed nitrogen at 450 ° C for 2 h. After nitrogen was switched to air, it was roasted at this temperature for another 2 h, and finally the samples obtained after roasting were ground and granulated to 80-200 mesh. In a fixed bed, the reduction temperature is 550 °C and the volume composition is 25%H 2 / 75%N 2 and space velocity of 6000 mL / (g·h) for 4 h to obtain the methanation nickel-based catalyst. The catalyst composition is: Ni 16wt%, ZrO 2 4 wt%, SiO 2 80 wt%.

[0028]The methanation performance of the catalyst was evaluated in a slurry bed metha...

Embodiment 2

[0031] Dissolve 7.6 parts of nickel acetate tetrahydrate, 0.6 part of cerium nitrate hexahydrate and 0.2 part of zirconium oxynitrate dihydrate in 70 parts of ethylene glycol aqueous solution with a volume fraction of 70% and start vigorous stirring at room temperature, and then add to the solution Slowly add 5 parts of silica carrier, continue to stir and raise the temperature to 60 °C for ultrasonic treatment for 4 h, then move it into a vacuum drying oven at 200 °C for 6 h, then put the sample into a tube furnace and pass nitrogen gas at 450 °C °C for 2 h, then switch from nitrogen to air and then roast at this temperature for another 2 h, and finally grind and granulate the sample obtained after roasting to 80-200 mesh. In a fixed bed, the reduction temperature is 550 °C and the volume composition is 45%H 2 / 55%N 2 and space velocity of 3000 mL / (g·h) for 8 h to obtain the methanation nickel-based catalyst. The catalyst composition is: Ni 25 wt%, CeO 2 2.5 wt%, ZrO 2 ...

Embodiment 3

[0034] Dissolve 10 parts of nickel nitrate hexahydrate and 1.6 parts of lanthanum nitrate hexahydrate in 75 parts of 40% glucose aqueous solution by volume and start vigorous stirring at room temperature, then slowly add 5 parts of silica carrier to the solution and continue stirring And heat up to 50 ° C for ultrasonic treatment for 4 h, then move into a vacuum oven to dry at 120 ° C for 4 h, then put the sample into a tube furnace and feed nitrogen at 500 ° C for 2 h, and switch the nitrogen to Air and then roasted at this temperature for 4 h, and finally the samples obtained after roasting were ground and granulated to 80-200 mesh. In a fixed bed, the reduction temperature is 550 °C and the volume composition is 45%H 2 / 55%N 2 and space velocity of 3000 mL / (g·h) for 8 h to obtain the methanation nickel-based catalyst. The catalyst composition is: Ni 26wt%, La 2 o 3 7.8wt%, SiO 2 66.2 wt%.

[0035] The methanation performance of the catalyst was evaluated in a slurry...

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Abstract

The invention relates to a preparation method of a nanometer nickel-based catalyst applied to carbon monoxide methanation reaction of a slurry reactor. The method comprises the steps of 1, completely dissolving 4-10 parts of nickel salt precursor and 0.5-2 parts of auxiliary salt precursor into enough carbon source precursor solution; 2, adding 5 parts of silicon dioxide carriers into the solution under the condition of stirring, and then ultrasonically immersing, thus allowing the nickel salt precursor, the auxiliary salt precursor and the carbon source precursor to be uniformly dispersed on the silicon dioxide carriers; 3, vacuum drying acquired impregnation liquid, roasting in an inert atmosphere, then roasting in the air atmosphere, grinding acquired samples, and sieving to acquire a catalyst precursor; and 4, recovering the catalyst precursor at high temperature to acquire the nanometer nickel-based CO methanation catalyst. The preparation method provided by the invention has the advantages of short technological process, simple operation, low cost, being prone to achieve large-scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of a nano-nickel-based methanation catalyst, in particular to a preparation method of a nano-nickel-based catalyst applied to a slurry bed carbon monoxide methanation reaction. Background technique [0002] Natural gas is a clean, safe, convenient and high-quality resource, and its consumption proportion in China is increasing year by year. In 2015, my country's dependence on foreign natural gas reached 32.2%, and it is expected to exceed 37.2% by 2020, which will bring new challenges to national energy security. Coal-to-natural gas technology is to convert high-carbon coal resources into low-carbon alternative natural gas (SNG) that is convenient for long-distance transportation, and its calorific value is ≥34.6 MJ / m 3 , The thermal energy utilization efficiency can reach 52.6%. The use of coal-to-natural gas technology can realize clean and efficient utilization of coal, and it is also one of the effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J23/83B01J37/02B01J37/34B01J37/08B01J37/18C07C9/04C07C1/04
Inventor 孟凡会李忠李鑫高源程杨
Owner TAIYUAN UNIV OF TECH
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