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Catalyst used for methanation of carbon dioxide, preparation method therefor and applications thereof

A methanation catalyst, carbon dioxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, hydrocarbon production from carbon oxides, etc., to achieve a simple preparation method, uniform dispersion, and inhibition of aggregation. Effect

Active Publication Date: 2014-11-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of existing catalysts in catalyzing carbon dioxide hydromethanation reactions, and provide a catalyst for carbon dioxide methanation and its preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take by weighing the urea of ​​144.1g respectively, it is dissolved in the deionized water of 1000ml; The Zr(NO 3 ) 4 aqueous solution; then, dissolve it all in 3000ml deionized water; then place it in an oil bath, heat while stirring, and when the color of the solution becomes cloudy, stir at this temperature for another 2 hours; then, cool, filter, and dry overnight; baked at 550°C for 2 hours to produce ZrO 2 Carrier; other oxide carriers, the preparation method is the same as above.

[0033] Fully ground ZrO after calcination at 550°C for 2 hours 2 The carrier powder is passed through a 200-mesh separating sieve; compressed into tablets at 20 MPa; pulverized, sieved, and 12-20-mesh granules are taken for later use.

[0034] Take 0.54gRuCl 3 , 2.86gMg(NO 3 ) 2 and 0.94g La(NO 3 ) 3 Dissolve in 2.6mL distilled water. This mixed aqueous solution was impregnated to 6.5g ZrO by equal volume impregnation method. 2 On the carrier, immerse at room temperature for ...

Embodiment 2

[0037] For the catalyst in Example 1, when the pressure is 0.1MPa, the temperature is 350°C, and the volume space velocity of the feed gas is 20000h -1 、H 2 / CO 2 Under the condition that the molar ratio is 3.7, the catalytic carbon dioxide hydromethanation reaction, H 2 Conversion rate 98.24%, CH 4 The selectivity is 99.65%.

Embodiment 3

[0039] Thoroughly ground CeO after calcination at 550°C for 2 hours 2 The carrier powder is passed through a 200-mesh separating sieve; compressed into tablets at 15 MPa; crushed, sieved, and 12-20-mesh granules are taken for later use.

[0040] Take 0.56gRu(NO 3 ) 3 NO and 1.43gMg(NO 3 ) 2 Dissolve in 2.8mL distilled water. Impregnate this mixed aqueous solution to 7.2g CeO by equal volume impregnation method 2 On the carrier, immerse at room temperature for 12 hours to make it fully absorbed. The obtained sample was dried in an oven at 120°C for 24 hours. After drying, the sample was placed in a muffle furnace, heated to 550°C at a heating rate of 2°C / min, calcined for 3 hours, and naturally cooled to room temperature in the muffle furnace. Then it was reduced with 2% hydrazine hydrate aqueous solution at room temperature for 24 hours, and then washed 10 times with water. Finally, the catalyst samples were dried in an oven at 120°C for 24 hours. That is to prepare ca...

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Abstract

The invention provides a catalyst used for methanation of carbon dioxide, a preparation method therefor and applications thereof. The catalyst employs precious metal Ru or Rh as a main catalytic activity component, employs one or more selected from elements of the I and II main groups and the II, III and VII subgroups as auxiliary agents, and employs one or more selected from SiO2, TiO2, Al2O3, CeO2 and ZrO2 as carriers. The above catalyst is used in graininess or the carriers, the auxiliary agents and the activity component are subjected to coating (wall loading) on a whole structural catalyst and metal honeycombs. The catalyst has characteristics of high activity and selectivity and wide temperature and pressure operation windows. The catalyst can be used for hydrogenation methanation removal of CO2 in a space station, then generated H2O is subjected to electrolysis, and circulation supply of oxygen is achieved. The catalyst also can be used for processes of other CO2 conversion utilization of coal-made natural gases and process gases and the like and new energy development and energy saving and emission reduction are achieved.

Description

technical field [0001] The invention belongs to the field of catalyst and aerospace technology, and in particular relates to a carbon dioxide methanation catalyst and its preparation method and application. Background technique [0002] The environment of the space station is closely related to the life safety of the astronauts and the success or failure of the aerospace industry. The control and life support system is a station-borne system that guarantees the life safety and work efficiency of astronauts. It mainly solves the regeneration of the atmosphere in the cabin and the recycling and treatment of waste water. Atmospheric regeneration technology is the CO produced by the metabolism of astronauts in the cockpit 2 For collection and concentration, the collected CO 2 Hydrogenation reduction is carried out to generate water, which is then supplied to the electrolysis system for electrolysis to produce oxygen. The waste water recovery and treatment technology room recy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/89C07C1/12C07C9/04
Inventor 王胜王树东李涛高典楠汪明哲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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