Low temperature high activity carbon dioxide methanation catalyst and preparation method 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. It is suitable for large-scale production and other problems, and achieves good hydrothermal stability and prevents hydrothermal oxidation.

Active Publication Date: 2017-11-24
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

; CN104511314A is a methanation catalyst prepared by loading Ranigold on the surface of an organic polymer material carrier. The preparation process of this catalyst is complicated, the cost is high, and it is not suitable for large-scale production

Method used

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  • Low temperature high activity carbon dioxide methanation catalyst and preparation method thereof
  • Low temperature high activity carbon dioxide methanation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of a low-temperature high-activity carbon dioxide methanation catalyst in this embodiment comprises the following steps:

[0023] Step A, preparation of nickel-aluminum hydrotalcite catalyst precursor:

[0024] Weigh 136.27g of Ni(NO 3 ) 2 ·6H 2 O, 316.4g of Al(NO 3 ) 3 9H 2 O, 6.06g of Fe(NO 3 ) 3 9H 2 O, 19.08g of Mg(NO 3 ) 2 ·6H 2 O, 2.66g of La(NO 3 ) 3 ·nH 2 O and 5.05g of Ce(NO 3 ) 2 ·8H 2 O, 168.22g of CO(NH 2) 2 , were added to a 500ml three-neck flask in turn, and then 300ml deionized water was added, stirred to dissolve into a mixed solution. With simethicone oil as the heating medium, reflux heating is carried out with a magnetic stirring heater. Control the temperature of the solution at 101°C, add 0.10 mol / L ammonia water drop by drop and maintain the pH value of the mother liquor at 7.5 to carry out the precipitation reaction; Excessive ammonium salt; the obtained filter cake was dried in a drying oven at 80°C for ...

Embodiment 2

[0028] In this embodiment, a method for preparing a low-temperature high-activity carbon dioxide methanation catalyst comprises the following steps:

[0029] Step A, preparation of nickel-aluminum hydrotalcite catalyst precursor:

[0030] Weigh 144.06g of Ni(NO 3 ) 2 ·6H 2 O, 294.33g of Al(NO 3 ) 3 9H 2 O, 3.03g of Fe(NO 3 ) 3 9H 2 O, 31.81g of Mg (NO 3 ) 2 ·6H 2 O, 1.33g of La(NO 3 ) 3 ·nH 2 O and 1.26g of Ce(NO 3 ) 2 ·8H 2 O, 180.21g of CO(NH 2 ) 2 , were added to a 500ml three-neck flask in turn, and then 300ml deionized water was added, stirred to dissolve into a mixed solution. With simethicone oil as the heating medium, reflux heating is carried out with a magnetic stirring heater. Control the temperature of the solution at 110°C, add 0.10 mol / L ammonia water drop by drop and maintain the pH value of the mother liquor at 8.0 to carry out the precipitation reaction; Excessive ammonium salt; the obtained filter cake was dried in a drying oven at 90°C f...

Embodiment 3

[0034] In this embodiment, a method for preparing a low-temperature high-activity carbon dioxide methanation catalyst comprises the following steps:

[0035] Step A, preparation of nickel-aluminum hydrotalcite catalyst precursor:

[0036] Weigh 155.74g of Ni(NO 3 ) 2 ·6H 2 O, 235.47g of Al(NO 3 ) 3 9H 2 O, 9.09g of Fe(NO 3 ) 3 9H 2 O, 12.73g of Mg(NO 3 ) 2 ·6H 2 O, 3.99g of La(NO 3 ) 3 ·nH 2 O and 3.78g of Ce(NO 3 ) 2 ·8H 2 O, 210.22g of CO(NH 2 ) 2 , were added to a 500ml three-neck flask in turn, and then 300ml deionized water was added, stirred to dissolve into a mixed solution. With simethicone oil as the heating medium, reflux heating is carried out with a magnetic stirring heater. Control the temperature of the solution at 100°C, add 0.10 mol / L ammonia water drop by drop and maintain the pH value of the mother liquor at 7.5 to carry out the precipitation reaction; Excessive ammonium salt; the obtained filter cake was dried in a drying oven at 90°C fo...

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Abstract

The invention provides a low temperature high activity carbon dioxide methanation catalyst and a preparation method thereof. CO(NH2)2 is used to replace NaOH and Na2CO3 to avoid the introduction of Na <+> ions. CO(NH2)2 slowly carries out hydrolysis at a temperature of 90 to 120 DEG C to generate OH<-> and CO2<-> for precipitation so that uniform precipitate [Ni<1-x><2+>Al<x><3+>(OH)<2>]<x+>(CO3)<x/2><2-> is generated. The precipitate is subjected to centrifugation, filtering, washing, drying, and burning to obtain a nickel-aluminum hydrotalcite catalyst precursor; and then potassium carbonate and calcium aluminate cement are added to carry out wet milling, kneading, flattening, and moulding to prepare a finished methanation catalyst. The preparation method has the advantages of simple technology, low cost, high catalyst strength, and long service life of catalyst. The methanation catalyst is activated at a temperature about 150 to 250 DEG C. When the temperature reaches 260 to 400 DEG C, the CO2 conversion rate can reach 90% or more, and the CH4 selectivity is close to 100%. The hydrothermal stability of the catalyst is good.

Description

technical field [0001] The invention belongs to the technical field of coal-based natural gas methanation, and in particular relates to a low-temperature high-activity carbon dioxide methanation catalyst and a preparation method thereof. Background technique [0002] In recent years, with the acceleration of urbanization, the human environment is facing increasingly serious air pollution, and the yellow warning of smog is becoming more and more frequent. Natural gas, as a clean, safe and efficient environment-friendly energy, is more and more popular Pay attention; at present, natural gas accounts for only 5.7% of my country's energy consumption structure, which is far lower than the international average of 24%. Considering my country's national energy conditions are "rich in coal, short of oil, and low in gas", the development of the coal-to-natural gas industry, directly at the mouth of the coal mine The one-time transformation of coal can be realized directly through the n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C07C1/12C07C9/04
Inventor 王晓龙刘蓉王琪何忠肖天存
Owner CHINA HUANENG GRP CO LTD
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