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Methanation method for coke-oven gas, and catalyst and preparation method thereof

A coke oven gas and methanation technology, applied in the field of coal chemical industry, can solve the problems of less energy recovery and increased energy consumption, and achieve the effects of high activity, high reactivity and simple preparation method

Inactive Publication Date: 2018-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction temperature of existing methanation catalysts is 250-550°C, which is generally controlled below 500°C in actual use, so a large amount of gas circulation is required in practical applications, resulting in less energy recovery and increased energy consumption

Method used

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  • Methanation method for coke-oven gas, and catalyst and preparation method thereof
  • Methanation method for coke-oven gas, and catalyst and preparation method thereof
  • Methanation method for coke-oven gas, and catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take by weighing 145 grams of nickel nitrate (Ni(NO 3 ) 2 .6H 2 O), 28 grams of lanthanum nitrate (La(NO 3 ) 3 .6H 2 O), 256 grams of magnesium nitrate (Mg(NO 3 ) 2 .6H 2 O) and 188 grams of aluminum nitrate (Al(NO 3 ) 3 .9H 2 (0), add 300 grams of urea, mix and dissolve in deionized water, stir the dissolved mixed solution at 45 to 55°C, further concentrate the solution, then inject the resulting solution into the air at a temperature of 500°C for reaction In the still, after reacting for 30 minutes, the temperature was lowered and the air was stopped to obtain nanocomposite oxide catalyst powder Ni 0.5 La 0.06 MgAl0.5 o 4 (The chemical formula is calculated by the content of each component). Nanocomposite oxide catalyst powder Ni 0.5 La 0.06 MgAl 0.5 o 4 After grinding through a 100-mesh sieve, add 6% of water and 1.5% of graphite, and press to form columnar particles.

Embodiment 2

[0041] Take by weighing 306 grams of nickel nitrate (Ni(NO 3 ) 2 .6H 2 O), 6 grams of lanthanum nitrate (La(NO 3 ) 3 .6H 2 O), 256 grams of magnesium nitrate (Mg(NO 3 ) 2 .6H 2 O) and 188 grams of aluminum nitrate (Al(NO 3 ) 3 .9H 2 (2), add 400 grams of urea, mix and be dissolved in deionized water, the mixed solution after dissolving is injected into the temperature 450 ℃ reaction kettle that feeds into the air, after reacting for 90 minutes, lower the temperature and stop the air to obtain the nanocomposite oxide catalyst Powder NiLa 0.01 MgAl 0.5 o 6 . NiLa 0.01 MgAl 0.5 o 6 After grinding through a 100-mesh sieve, add 8% of water and 2% of graphite, and press to form columnar particles.

Embodiment 3

[0043] Weigh 290 grams of nickel nitrate (Ni(NO 3 ) 2 .6H 2 O), 430 grams of zirconium nitrate (Zr(NO 3 ) 4 .5H 2 O), 8.4 grams of cerium nitrate (Ce(NO 3 ) 3 .6H 2 (2), after adding 380 grams of urea and mixing, be dissolved in deionized water, and the mixed solution after dissolving is injected into a 400° C. reactor at a temperature of 400° C. of air, and after reacting for 30 minutes, cool down and stop the air to obtain a nanocomposite oxide catalyst Powder NiCe 0.02 ZrO 4 . NiCe 0.02 ZrO 4 After grinding through an 80-mesh sieve, add 8% white cement for mixing, then add 8% water and 2% graphite, and press it into hollow columnar particles.

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Abstract

The invention relates to a methanation method for coke-oven gas, and a catalyst and a preparation method thereof, belonging to the field of coal chemical industry. The methanation method for coke-ovengas comprises the following steps: contacting coke-oven gas with a nanometer composite oxide catalyst in a reactor; and carrying out a methanation reaction on the coke-oven gas under the conditions of a reaction temperature of 230 to 800 DEG C, a pressure of 2.0 to 7.0 MPa and gas space velocity of 4000 to 30000 / h. The nanometer composite oxide catalyst used in the methanation method overcomes the problem that the crystal grain of active metal becomes large due to sintering of a great number of metal particles resulting from high-temperature roasting of traditional supported catalysts, and the nanometer composite oxide catalyst has high reaction activity. Nitrate used for the catalyst does not produce nitrogen oxide during preparation of the catalyst, so the requirement for green chemistry is met.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a coke oven gas methanation method, a catalyst and a preparation method thereof. Background technique [0002] Coke oven gas, also known as coke oven gas, is a mixed combustible gas that is produced by coke and tar after high-temperature dry distillation of coal in a coke oven. Its composition is 55-60% of hydrogen, 0-30% of methane, 5-7% of carbon monoxide, 1.5-3% of carbon dioxide, 3-7% of nitrogen and so on. [0003] Since the greenhouse gas produced by natural gas combustion is only 1 / 2 of that of coal and 2 / 3 of that of oil, the degree of damage to the environment is less than that of coal and oil. In the face of increasingly serious environmental problems, the use of natural gas is encouraged to increase the use of natural gas. The proportion of energy consumption has become the only way. [0004] Hydrogen and methane in coke oven gas are clean and combustible gases....

Claims

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Application Information

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IPC IPC(8): C10L3/08B01J23/755B01J23/83
CPCB01J23/002B01J23/755B01J23/83B01J2523/00C10L3/08B01J2523/847B01J2523/3706B01J2523/22B01J2523/31B01J2523/3712B01J2523/48
Inventor 王秀玲徐洋
Owner CHINA PETROLEUM & CHEM CORP
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