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Preparation method of CO selective methanation catalyst

A methanation catalyst and selective technology, which is applied in the field of preparation of CO selective methanation catalyst, can solve the problems of reaction temperature being deeply influenced by gas space velocity, low catalyst reaction temperature, increased production cost, etc., to achieve catalytic activity and Effects of improved stability, increased catalyst activity, and easy conditions

Active Publication Date: 2013-02-27
HANERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this catalyst is that its high precious metal content leads to higher production costs
[0010] Compared with Ni-based catalysts, Ru-based catalysts have the advantages of low catalyst reaction temperature, high activity and selectivity, but the above-mentioned Ru-based catalysts have a relatively narrow reaction temperature range and their reaction temperature is deeply affected by gas space velocity.

Method used

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  • Preparation method of CO selective methanation catalyst

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Embodiment 1

[0031] A CO selective methanation catalyst, including active component Ru, also includes nano-cerium-zirconium composite oxide support, wherein the molar ratio of Ce, Zr is 3:1; the content of Ru accounts for 0.5wt% of the catalyst; characterized by TEM ,like figure 1 As shown, the particle diameter of the nano-cerium-zirconium composite oxide carrier is 5-20nm, mostly 5-10nm. The preparation method is as follows:

[0032] (1) the nitrate that the mol ratio is 3: 1 Ce: Zr is dissolved in deionized water, is configured into the solution of concentration 0.2mol / L; Concentration is that the industrial ammonia water of 25% is diluted 1.5 times as precipitating agent, in continuous Under stirring, add the above-mentioned salt solution dropwise to the above-mentioned precipitant at a rate of 5ml / min, and control the pH to 9. After the precipitation is complete, age at room temperature for 6 hours, wash with deionized water for 6 times, and replace the obtained precipitate with abso...

Embodiment 2

[0036] A CO selective methanation catalyst, including active component Ru, also includes nano-cerium-zirconium composite oxide support, wherein the molar ratio of Ce, Zr is 1:3; the content of Ru accounts for 0.2wt% of the catalyst; characterized by TEM ,like figure 1 As shown, the particle diameter of the nano-cerium-zirconium composite oxide carrier is 5-20nm, mostly 5-10nm. The preparation method is as follows:

[0037] (1) be that the nitrate of Ce: Zr that molar ratio is 1: 3 is dissolved in deionized water, is configured into the solution of concentration 0.2mol / L; Concentration is that the industrial ammonia water of 25% is diluted 1.5 times as precipitation agent, in continuous Under stirring, add the above-mentioned salt solution dropwise to the above-mentioned precipitant at a rate of 5ml / min, and control the pH to 13. After the precipitation is complete, age at room temperature for 6 hours, wash with deionized water for 6 times, and replace the obtained precipitate...

Embodiment 3

[0041] A CO selective methanation catalyst, including active component Ru, also includes nano-cerium-zirconium composite oxide support, wherein the molar ratio of Ce, Zr is 1:6; the content of Ru accounts for 2wt% of the catalyst; characterized by TEM, like figure 1 As shown, the particle diameter of the nano-cerium-zirconium composite oxide carrier is 5-20nm, mostly 5-10nm. The preparation method is as follows:

[0042] (1) be that the nitrate of Ce: Zr that molar ratio is 1: 6 is dissolved in deionized water, is configured into the solution of concentration 0.2mol / L; Concentration is that the industrial ammonia water of 25% is diluted 1.5 times as precipitation agent, in continuous Under stirring, add the above-mentioned salt solution dropwise to the above-mentioned precipitant at a rate of 5ml / min, and control the pH to 11. After the precipitation is complete, age at room temperature for 6 hours, wash with deionized water for 6 times, and replace the obtained precipitate w...

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Abstract

The invention discloses a preparation method of a CO selective methanation catalyst, in particular to a preparation method of a CO selective methanation catalyst using nanometer cerium-zirconium composite oxide as a carrier, which comprises the following steps: dissolving the nitrates of Ce and Zr into water; keeping the pH value within the range from 9 to 13; and then stirring, precipitating, aging and washing; using a drying medium to replace water in the obtained precipitate, and baking the precipitate under the temperature of 300-900 DEG C for 5-8h after being dried; mixing the product and water together, and then being pulverized by ultrasound to obtain suspension liquid; heating and stirring the suspension liquid in the water bath, and then mixing with the precursor of Ru, wherein the pH value is controlled between 9 and 11; fully depositing and precipitating Ru on the product; aging the product at water bath temperature, and then, washing, drying and baking the product under the temperature of 300-900 DEG C for 2-5h; and finally, obtaining the CO selective methanation catalyst. The preparation method has the advantages of simple technology, relatively low cost, good catalyst activity, high strength and high selectivity in the whole reaction temperature area.

Description

technical field [0001] The invention relates to a preparation method of a CO selective methanation catalyst, in particular to a preparation method of a CO selective methanation catalyst with nano-cerium-zirconium composite oxide as a carrier. Background technique [0002] Proton Exchange Membrane Fuel Cell (PEMFC) is a power generation device that directly converts chemical energy into electrical energy through electrochemical reactions. Compared with traditional power generation devices, it has high energy conversion efficiency, no pollution, low noise, and adaptability With the advantages of different power requirements, it has broad application prospects as a fixed power supply (such as a power station) and a mobile power supply for electric vehicles, submarines, aerospace, etc. One form of energy. As the fuel of the PEMFC system, hydrogen mainly comes from the reforming reaction of methanol or natural gas, so 2-15% CO will inevitably remain in the hydrogen. Since a sma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63C07C1/04C07C9/04H01M8/06H01M4/90
CPCY02E60/50Y02P70/50
Inventor 肖钢孙伟华周帅林
Owner HANERGY TECH
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