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Coated CoNi/Al2O3 catalyst as well as preparation method and application thereof

A catalyst and coating technology, which is used in the synthesis and catalytic application of advanced nano-catalysts, can solve the problems of unfavorable large-scale preparation, cumbersome preparation methods, and poor catalyst activity, and achieve favorable catalytic activity, high CH4 selectivity, The effect of excellent life

Active Publication Date: 2020-08-07
HUANGGANG NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above analysis shows that the preparation methods of cobalt-modified nickel-based supported catalysts reported at present still have the problems of cumbersome preparation methods, low efficiency, unfavorable large-scale preparation, and poor catalyst activity. Combining the above analysis, a novel And a simple method to obtain CoNi / Al with high dispersion, small particle size of active components, high methanation activity and long catalyst life 2 o 3 Catalyst remains a big challenge

Method used

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  • Coated CoNi/Al2O3 catalyst as well as preparation method and application thereof
  • Coated CoNi/Al2O3 catalyst as well as preparation method and application thereof
  • Coated CoNi/Al2O3 catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 22.51g of aluminum nitrate was dissolved in 240ml of water to obtain an aluminum salt solution with a concentration of 0.25mol / L, then 0.46g of cobalt hydroxide and 0.46g of nickel hydroxide were added to the aluminum salt solution and stirred at room temperature for 24h to obtain a solution containing nickel and A uniform mixed sol of aluminum, the obtained mixed sol was baked at 80°C for 48 hours to obtain a mixed gel, and the obtained mixed gel was fired at 400°C for 4 hours under a hydrogen atmosphere to obtain a coated CoNi / Al with a loading capacity of 16%. 2 o 3 catalyst.

[0032] The morphology of the product prepared in this embodiment is characterized by transmission electron microscope, as figure 1 with figure 2 As shown, the prepared catalyst has a porous coating morphology, which is conducive to the high dispersion of the catalyst, and the porous structure is conducive to limiting the growth of the catalyst and maintaining the catalytic activity.

[003...

Embodiment 2

[0036] 7.2g of aluminum chloride was dissolved in 30ml of water to obtain an aluminum salt solution with a concentration of 1mol / L, then 0.92g of cobalt hydroxide and 0.92g of nickel hydroxide were added to the aluminum salt solution and stirred at room temperature for 72h to obtain a solution containing nickel and A homogeneous mixed sol of aluminum, the obtained mixed sol was baked at 120°C for 12h to obtain a mixed gel, and the obtained mixed gel was fired at 600°C under a hydrogen atmosphere for 1h to obtain a coated CoNi / Al with a loading capacity of 44%. 2 o 3catalyst. The morphology of the product was characterized by transmission electron microscopy, as Figure 5 As shown, the catalyst prepared in Example 2 has a porous coating structure, which is beneficial to the maintenance of the catalytic activity of the catalyst.

Embodiment 3

[0038] Catalytic Methanation Test

[0039] The catalytic methanation reaction is tested on a fixed bed, and the specific test process will be described in detail in the following examples.

[0040] Get the coating type CoNi / Al that 0.1g embodiment prepares 2 o 3 The catalyst carries out the CO methanation reaction, which is carried out on a micro-reaction high-pressure fixed bed-chromatographic analysis integrated system device. Sieve the catalyst pellets, select catalyst particles (40-60 mesh) and fill them in a stainless steel reaction tube with a quartz liner. 2 Reduction under the atmosphere for 2h. After reduction, adjust the temperature to the desired reaction temperature and switch to H 2 React with a mixed atmosphere of CO. One hour after the start of the reaction, samples were taken and analyzed with a six-way valve, and samples were taken every other hour for analysis thereafter.

[0041] The analysis of raw gas and products is carried out by an online gas chro...

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Abstract

The invention belongs to the field of synthesis and catalytic application of advanced nano catalysts, and particularly relates to a coated CoNi / Al2O3 catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: step 1, dissolving a water-soluble aluminum salt in water to obtain an aluminum salt solution; step 2, weighing corresponding massof nickel hydroxide and cobalt hydroxide according to a certain molar ratio of Co to Ni to Al, adding the nickel hydroxide and the cobalt hydroxide into the aluminum salt solution, and stirring to obtain uniform mixed sol; step 3, drying the mixed sol at a certain temperature for a period of time to obtain mixed xerogel; and step 4, roasting and reducing the mixed xerogel at a certain temperaturein a hydrogen atmosphere to obtain the coated CoNi / Al2O3 catalyst. The preparation method is simple to operate, the raw materials are low in price, the cost is greatly reduced, and large-scale production is facilitated. The prepared coated catalyst has the advantages of high CO2 conversion rate, high CH4 selectivity and excellent service life.

Description

technical field [0001] The invention belongs to the field of synthesis and catalytic application of advanced nanocatalysts, in particular to a coated CoNi / Al 2 o 3 Catalysts, their preparation and applications. Background technique [0002] The principle of carbon dioxide methanation reaction is that at a certain temperature and under the action of a methanation catalyst, CO 2 with H 2 A reaction occurs to generate CH4 and water vapor, and after cooling, the water vapor is condensed and separated, and finally CH4 is obtained. The methanation reaction is a volume-reducing, strongly exothermic process. In the actual industrial production process, a large amount of heat will be released during the methanation reaction of high-concentration carbon dioxide, and the temperature of the reactor will increase greatly, which will easily cause catalyst sintering and carbon deposition, which will greatly reduce the activity and life of the catalyst. Based on this, industrial proces...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/10B01J35/02C07C1/04C07C9/04
CPCB01J23/755C07C1/0435C07C2523/755B01J35/396B01J35/50B01J35/60C07C9/04
Inventor 解明江郝盼盼郭学锋田正芳李慕鸿严咏刘健吕昌昌马尚
Owner HUANGGANG NORMAL UNIV
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