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Liquid-phase CO2 methanation catalyst, preparation method and application of catalyst

A methanation catalyst, CO2 technology, applied in the direction of physical/chemical process catalysts, catalytic reactions, chemical instruments and methods, etc., can solve the problems of catalyst strength decline, catalyst layer erosion, large energy consumption, etc., to prevent aggregation and avoid Easy to fall off at high temperature, realize the effect of recovery and recycling

Active Publication Date: 2012-10-10
WUHAN KAIDI ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past few decades, Ni-based catalysts have been widely studied as the most active methanation non-precious metal catalysts. Patents CN102091629 A and CN 101773833 A disclose nickel-based CO2 methanation catalysts, but This method not only needs to consume a lot of energy, but also the strength of the catalyst will decrease under high temperature and high partial pressure of water vapor, and the catalyst layer deposited on the surface of the substrate will also erode and fall off, while limiting CO2Application of Methanation Catalysts

Method used

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  • Liquid-phase CO2 methanation catalyst, preparation method and application of catalyst
  • Liquid-phase CO2 methanation catalyst, preparation method and application of catalyst
  • Liquid-phase CO2 methanation catalyst, preparation method and application of catalyst

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Experimental program
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Effect test

Embodiment 1

[0028] Mix and disperse nickel nitrate, magnesium nitrate and 1-16 alkyl-3-methylimidazole hydrochloride ionic liquid in the liquid medium water at a molar ratio of 1:0.2:20 at room temperature to obtain a mixed system solution. The concentration of nickel nitrate in the system solution is 2.79×10 -4 mol / L, then add ammonia water to adjust the pH value of the system to 9.0, continue to stir and react for 3h, then transfer the reaction solution to the reactor at 150 o C. Pass H under 3.0MPa 2 Reduction for 2 hours, finally centrifuged, filtered, washed with water, washed with ethanol, and dried. Tested by TEM, see figure 1 . Depend on figure 1 It can be seen that the liquid phase CO 2 The average particle size of the metal active component nanoparticles in the methanation catalyst is 11.8nm, and the particle size distribution is narrow and uniform.

[0029] Using the above catalysts for CO 2 The methanation reaction is specifically: take an appropriate amount of the abov...

Embodiment 2

[0031]At room temperature, nickel acetate, lanthanum nitrate and 1-18 alkyl-3-methylimidazolium hexafluorophosphate ionic liquid were mixed and dispersed in the liquid medium ethanol at a molar ratio of 1:0.15:20 to obtain a mixed system solution. The molar concentration of nickel acetate is 3.61×10 -4 mol / L, then add triethylamine to adjust the pH value of the system to 8.0, continue to stir and react for 2h, then transfer the reaction solution to the reactor at 100 o C. Inject H under 3.0MPa pressure 2 Reduction for 1.5h, finally centrifuged, filtered, washed with water, washed with ethanol, and dried.

[0032] Using the above catalysts for CO 2 The methanation reaction is specifically: take an appropriate amount of the above-mentioned catalyst and add it to the reactor, then add an appropriate amount of solvent water, and control the concentration of the catalyst in the reaction system to be 0.005mol / L. According to nH 2 : nCO 2 =4, pass into CO 2 and H 2 , then heate...

Embodiment 3

[0034] Nickel nitrate, cerium nitrate and amphiphilic ionic liquid N-dodecylpyridinium tetrafluoroborate (C 12 PyB 4 ) in a molar ratio of 1:0.15:18 and mixed and dispersed in liquid medium acetonitrile to obtain a mixed system solution, the concentration of nickel nitrate in the mixed system being 1.32×10 -3 mol / L, then add diisopropyl tert-butylamine to adjust the pH value of the system to 10.0, continue to stir and react for 3h, then transfer the reaction solution to the reactor at 150 o C. Inject H under 3.0MPa pressure 2 Reduction for 1.5h, finally centrifuged, filtered, washed and dried.

[0035] Using the above catalysts for CO 2 The methanation reaction is specifically: take an appropriate amount of the above-mentioned catalyst and add it to the reaction kettle, then add an appropriate amount of solvent acetonitrile, and control the concentration of the catalyst in the reaction system to be 0.005mol / L, according to nH 2 : nCO 2 =4, pass into CO 2 and H 2 , then...

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Abstract

The invention relates to a liquid-phase CO2 methanation catalyst, a preparation method and application of the catalyst. The liquid-phase CO2 methanation catalyst comprises amphipathic ionic liquid and metal active components dispersed in the amphipathic ionic liquid in the state of stable colloid, the grain sizes of the metal active components range from 0.5nm to 20nm, the spherical metal active components include a first metal active component and a second metal active component, the first metal active component includes nickel, the second metal active component includes one or mixture of more than one of lanthanum, cerium, molybdenum, ruthenium, ytterbium, rhodium, palladium, platinum, potassium and magnesium, and the molar ratio of the first metal active component to the second metal active component is 10:0.1-2. The metal active components in the liquid-phase CO2 methanation catalyst are small in grain size, narrow in distribution, wide in application prospect, easy to separate and recyclable, CO2 methanation of low-temperature liquid phase can be realized at the temperature of 100-200 DEG C, the liquid-phase CO2 methanation catalyst has excellent low-temperature catalytic activity, methane selectivity and heat stability, and the preparation method is simple and practicable, low in cost and easy in popularization.

Description

technical field [0001] The invention relates to the field of catalytic synthesis and nanomaterials, in particular to a liquid phase CO 2 Methanation catalyst, preparation method and application thereof. Background technique [0002] Natural gas is a high-quality, clean energy and efficient hydrocarbon resource. With the acceleration of urbanization and the improvement of people's living standards, people's demand for natural gas is growing rapidly. There is a large gap between the supply and demand of natural gas. As an effective way to transform high-carbon energy into low-carbon, hydrogen-rich energy, synthetic natural gas technology has good environmental and economic benefits. [0003] Meanwhile, in recent years, CO 2 Increased emissions contribute to global warming, reducing CO 2 Methanation can not only solve CO 2 emissions, and high-quality, clean energy can be synthesized, so CO 2 Methanation reactions have attracted widespread attention. In the past few deca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J31/06C07C9/04C07C1/12
CPCC07C9/04B01J31/06B01J31/0284C07C1/12B01J2231/625B01J31/02B01J23/78B01J23/83B01J23/883B01J23/892B01J31/28B01J31/34B01J35/0013B01J31/0285B01J2531/847
Inventor 张岩丰詹晓东郑兴才王志龙方章建薛永杰陶磊明
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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