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Nickel-based methanation catalyst promoted by in-situ growth of carbon nanotubes and preparation method thereof

A technology of in-situ growth of carbon nanotubes, applied in the petroleum industry, gas fuels, fuels, etc., can solve the problems of technology dependence, lack of mastery of synthesis gas methanation process, etc., and achieve good reactivity and good low-temperature methanation reactivity , The effect of cheap and easy-to-obtain raw materials

Inactive Publication Date: 2015-08-05
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, there have been many coal-to-SNG projects in China, and some units have also developed methanation catalysts such as KD-306 and SG-100, but they have not yet mastered the synthesis gas methanation process, and the main technology relies on foreign companies

Method used

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  • Nickel-based methanation catalyst promoted by in-situ growth of carbon nanotubes and preparation method thereof
  • Nickel-based methanation catalyst promoted by in-situ growth of carbon nanotubes and preparation method thereof
  • Nickel-based methanation catalyst promoted by in-situ growth of carbon nanotubes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) 9.319g Ni(NO 3 ) 2 ·6H 2 O and 17.949g Mg(NO 3 ) 2 ·6H 2 O (purities are all AR pure) mixed, add 50mL deionized water to dissolve and prepare solution A; mix 9.330g NaOH and 6.181g NaHCO 3 (Purities are all AR pure) dissolved in 145mL deionized water to prepare solution B.

[0034] 2) At room temperature, add solution A and solution B dropwise into the reaction vessel at the same time, and keep the pH value of the mixture at 9.8-10.2 by controlling the drop rate of solution A and solution B under the condition of constant stirring, and drop solution A After the addition, use solution B to adjust the pH of the precipitation solution to 10. Place the precipitate in an oil bath at 363K for 12 hours, filter the obtained precipitate, and wash repeatedly for 3 to 4 times until the filtrate is neutral, then dry it in a 383K oven for 12 hours, and roast it in an air atmosphere of 723K for 5 hours to obtain Ni / MgO catalyst precursor.

[0035] 3) The catalyst precursor...

Embodiment 2

[0038] 1) Same as step 1) in Example 1.

[0039] 2) Same as step 2) in Example 1.

[0040] 3) The catalyst precursor is pressed into tablets and sieved to 40-80 mesh, the dosage is 100 mg, and mixed with 500 mg of quartz sand of the same mesh and diluted in the reactor, under normal pressure of 5% H 2 / Ar (volume percent) airflow (flow rate: 30mL / min) in 5K / min programmed temperature to 873K for 5h reduction to obtain the reduced nickel catalyst. Switch the gas flow to high-purity CO (99.9%) at 873K for 7.5 minutes with a space velocity of 18000mL STP h -1 · g-cat -1 , switch to 5%H 2 / Ar (flow rate 30mL / min), then lower the temperature to 823K for 2h to remove impurity carbon, and finally lower to 473K for evaluation. The catalyst obtained at this time is a catalyst for in-situ growth of carbon nanotubes, and the mass percentages of each component in the catalyst are: carbon nanotubes 16.4%; Ni 33.4%, and the balance is MgO.

[0041] The catalyst activity evaluation re...

Embodiment 3

[0043] 1) Same as step 1) in Example 1.

[0044] 2) Same as step 2) in Example 1.

[0045] 3) The catalyst precursor is pressed into tablets and sieved to 40-80 mesh, the dosage is 100 mg, and mixed with 500 mg of quartz sand of the same mesh and diluted in the reactor, under normal pressure of 5% H 2 / Ar (volume percent) airflow (flow rate: 30mL / min) in 5K / min programmed temperature to 873K for 5h reduction to obtain the reduced nickel catalyst. Switch the gas flow to high-purity CO (99.9%) at 873K for 10 minutes with a space velocity of 18000mL STP h -1 · g-cat -1 , switch to 5%H 2 / Ar (flow rate 30mL / min), then lower the temperature to 823K for 2h to remove impurity carbon, and finally lower to 473K for evaluation. The catalyst obtained at this time is the catalyst for growing carbon nanotubes in situ, and the mass percentages of the components in the catalyst are: carbon nanotubes 22.2%, Ni 31.1%, and the balance MgO.

[0046] The catalyst activity evaluation result...

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Abstract

The invention discloses a nickel-based methanation catalyst promoted by an in-situ grew carbon nano tube and a preparation method for the nickel-based methanation catalyst and relates to a methanation catalyst. The catalyst comprises a main component and a promoter, wherein the main component comprises Ni and Mg; the promoter is the carbon nano tube and is represented by Ni / MgO-CNTs. The preparation method comprises the steps of mixing Ni(NO3)2*6H2O and Mg(NO3)2*6H2O, and dissolving the mixture in water to prepare a solution A, dissolving NaOH and NaHCO3 in water to prepare a solution B; adding the solution A and the solution B into a reaction container for reaction, aging and filtering precipitation liquid, washing until the filtrate is neutralized, drying and roasting to obtain an Ni / MgO catalyst precursor, then performing tabletting and screening, performing mixed dilution through quartz sand, putting the precursor in a rector, heating to 873K, reducing the precursor to obtain an Ni / MgO catalyst in a reduced state, converting gas flow into CO gas reaction, growing the carbon nano tube in situ, cooling to 823K to remove carbon impurities, and cooling to 473K to obtain a product.

Description

technical field [0001] The invention relates to a methanation catalyst, in particular to a nickel-based methanation catalyst promoted by in-situ growth of carbon nanotubes and a preparation method thereof. Background technique [0002] The efficient utilization of fossil energy and the development of biomass renewable energy are one of the most concerned energy issues in the world. my country's pattern of "rich in coal, poor in oil, and low in gas" determines the dominant position of coal in the energy consumption structure, and biomass with rich resources and low pollution is likely to become an important part of the future sustainable energy system. Using coal or Biomass production of clean and high-quality synthetic natural gas (SNG) is one of the hot technologies for efficient energy utilization. In recent years, papers and reports on SNG made from coal or biomass published at home and abroad are not uncommon. [0003] One of the key technologies for producing SNG from ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78C10L3/08
Inventor 凡美婷林敬东廖代伟
Owner XIAMEN UNIV
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