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Supported precious metal methanation catalyst, and preparation method and application thereof

A technology for methanation catalyst and precious metal oxide, applied in the field of supported precious metal methanation catalyst and preparation, can solve the problems of agglomeration, small pore size, small specific surface area, etc., and achieves reduction of preparation cost, improvement of methanation activity, and improvement of dispersibility Effect

Inactive Publication Date: 2014-05-28
SEDIN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the active components of the methanation catalyst prepared by the solution combustion method have obvious agglomeration, small pore size and relatively small specific surface area, and it is necessary to make targeted improvements to the above deficiencies in order to further improve its performance in slurry bed methanation. Activity, improve the catalytic efficiency of noble metals

Method used

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  • Supported precious metal methanation catalyst, and preparation method and application thereof
  • Supported precious metal methanation catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 1.2g of ruthenium nitrate and 2g of urea, dissolve in 10mL of water, add 9.5g of alumina, impregnate and stir at room temperature for 24h, pour the suspension into a ceramic evaporating dish, put it in a muffle furnace, and heat to 500°C , self-combustion, the powder after combustion is collected, ground and granulated to 60-100 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 catalyst into a fixed bed reactor, at a temperature of 450°C, the gas volume composition is 15%H 2 with 85%N 2 , reduced for 6h at a space velocity of 3000mL / (g·h). 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

[0025] Weigh 0.5g rhodium nitrate and 5g ethylene glycol, dissolve in 10mL water, add 9.8g zirconium dioxide, impregnate and stir at room temperature for 24h, pour the suspension into a ceramic evaporating dish, put it in a muffle furnace, and heat At 400°C, it burns by itself, collects the remaining powder after combustion, grinds it and granulates it to 100-140 mesh to obtain a methanation catalyst. The catalyst consists of: Rh 2 o 3 2wt.%, ZrO 2 98wt.%. Put a certain mass of the above-mentioned catalyst into a fixed-bed reactor, at a temperature of 650 °C, and a gas volume composition of 10% H 2 with 90%N 2 , reduced for 2h at a space velocity of 5000mL / (g·h). 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

[0027] Weigh 0.6g of palladium nitrate and 2g of glycine, dissolve in 10mL of water, add 9.7g of cerium oxide, impregnate and stir at room temperature for 24h, pour the suspension into a ceramic evaporating dish, put it into a muffle furnace, and heat to 300 ℃, self-combustion, the remaining powder after combustion is collected, ground and granulated to 120-160 mesh to obtain a methanation catalyst. The catalyst composition is: PdO3wt.%, CeO 2 97wt.%. Put a certain mass of the above-mentioned catalyst into a fixed-bed reactor, at a temperature of 400 °C, and a gas volume composition of 5% H 2 with 95%N 2 , reduced for 5h at a space velocity of 10000mL / (g·h). 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 provides a supported precious metal methanation catalyst, comprising, by weight, 0.5 to 10% of a precious metal oxide and 90 to 99.5% of a carrier. The catalyst has the advantages of applicability to fixed-bed microscale CO methanation and stable catalytic performance.

Description

technical field [0001] The invention belongs to a methanation catalyst, in particular to a supported noble metal methanation catalyst, 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 catalysts to methanate a small amount of CO in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/46B01J23/44B01J23/42C01B3/58
Inventor 张庆庚崔晓曦李忠孟凡会吉可明
Owner SEDIN ENG
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