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Precious metal methanation catalyst prepared by solution combustion method, preparation method and application

A methanation catalyst and solution combustion technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of small pore size and small specific surface area of ​​methanation catalysts and other problems, to achieve the effect of improving catalytic performance, large specific surface area and reducing energy consumption

Inactive Publication Date: 2016-06-08
TAIYUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the methanation catalyst prepared by the solution combustion method has a small pore size and a small specific surface area, so targeted improvements are needed to further improve its activity in slurry bed methanation and improve the catalytic efficiency of noble metals.

Method used

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  • Precious metal methanation catalyst prepared by solution combustion method, preparation method and application
  • Precious metal methanation catalyst prepared by solution combustion method, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 1.2g of ruthenium nitrate, 69.9g of aluminum nitrate and 15g of urea, fully dissolve in 120mL of water, pour the solution into a ceramic evaporating dish, ignite under the conditions of microwave radiation wavelength 15cm, power 70W / mL solution, and collect the remaining powder after combustion , Grinding and granulating to 50-70 mesh to obtain a methanation catalyst. The catalyst composition is: RuO 2 5wt.%, Al 2 o 3 95wt.%. Put a certain mass of the above-mentioned catalyst into a 250mL fixed-bed reactor for reduction, the reduction condition is 450°C, and the volume composition is 15%H 2 with 85%N 2 , the space velocity is 3000mL / (g·h) and reduced for 6h. The reduced catalyst is used for fixed-bed methanation reaction, and the specific reaction conditions and results are shown in Attached Table 1.

Embodiment 2

[0030] Weigh 0.5g of rhodium nitrate, 18.6g of zirconium oxynitrate, 5g of ethylene glycol and 5g of polyethylene glycol-2000 and fully dissolve them in 45mL of water, pour the solution into a ceramic evaporating dish, microwave radiation wavelength 12cm, power 50W / mL solution conditions Ignite under the pressure, collect the remaining powder after combustion, grind and granulate to 60-80 mesh to obtain the methanation catalyst. The catalyst consists of: Rh 2 o 3 2wt.%, ZrO 2 98wt.%. Put a certain mass of the above catalyst into a 250mL fixed-bed reactor for reduction, the reduction condition is 650°C, and the volume composition is 10%H 2 with 90%N 2 , the space velocity is 5000mL / (g·h) and reduced for 2h. The reduced catalyst is used for fixed-bed methanation reaction, and the specific reaction conditions and results are shown in Attached Table 1.

Embodiment 3

[0032] Weigh 0.6g of palladium nitrate, 24.5g of cerium nitrate, 7g of glycine, and 3g of polyethylene glycol-1000 in 35mL of water to fully dissolve, pour the solution into a ceramic evaporating dish, microwave radiation with a wavelength of 17cm, and ignite under the conditions of a power of 40W / mL solution , collect the remaining powder after combustion, grind and granulate to 50-70 mesh to obtain the methanation catalyst. The catalyst composition is: PdO3wt.%, CeO 2 97wt.%. Put a certain mass of the above catalyst into a 250mL fixed-bed reactor for reduction, the reduction condition is 400°C, and the volume composition is 5%H 2 with 95%N 2 , the space velocity was 10000mL / (g·h) and reduced for 5h. The reduced catalyst is used for fixed-bed methanation reaction, and the specific reaction conditions and results are shown in Attached Table 1.

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Abstract

The invention discloses a precious metal methanation catalyst prepared by using a solution combustion method, which comprises the following components in percentage by weight: 1-10% of precious metal oxides and 90-99% of a carrier. The precious metal methanation catalyst disclosed by the invention has the advantages that the catalyst is applicable to a trace CO methanation process, and stable in catalytic performance.

Description

technical field [0001] The invention belongs to a noble metal catalyst, in particular to a noble metal catalyst for methanation of trace CO prepared by a solution combustion method, a preparation method and an application. Background technique [0002] Hydrogen is an important industrial raw material, which is widely used in petrochemical industry, electronic industry, metallurgical industry, food processing, fine organic synthesis, aerospace and so on. Hydrogen is generally produced by gasifying coal and then adjusting the hydrogen-to-carbon ratio through the water vapor shift reaction. Restricted by the reaction equilibrium conditions and technological process, the hydrogen obtained after the shift reaction contains a small amount of CO. If it is not completely removed, it is easy to cause catalyst deactivation during the use of hydrogen, which seriously affects the utilization of hydrogen. At present, hydrogen purification generally uses nickel-based or noble metal-based...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46B01J23/63C01B3/58
Inventor 李忠吉可明孟凡会郑华艳张庆庚崔晓曦
Owner TAIYUAN UNIV OF TECH
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