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Pre-reduction type high-temperature methanation catalyst and preparation method thereof

A methanation catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve high specific surface area, save time, and easy to use

Active Publication Date: 2016-07-27
XIAN SUNWARD AEROSPACE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a pre-reduction high-temperature methanation catalyst, which solves the problem that most of the active component nickel in the existing methanation catalyst is in an oxidized state and needs to be reduced before use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Dissolve 44.6g nickel nitrate, 264.8g aluminum nitrate, 6.6g lanthanum nitrate in 800mL water;

[0026] (2) adding the above-mentioned aqueous solution to the reactor, stirring, heating to 70 ° C, then adding 1500 mL of oxalic acid solution with a concentration of 0.48 mol / L, and adjusting the pH to 7 with 10% ammonia, washing and filtering to obtain a catalyst semi-finished product;

[0027] (3) drying the obtained semi-finished product at 150°C for 10h;

[0028] (4) Put the dried material in inert gas N 2 Roasting under the protection for 3h, the roasting temperature is 350 ℃;

[0029] (5) be cooled to 120 ℃, pass a small amount of air to passivate the product after roasting;

[0030] (6) Mixing 5% graphite and a small amount of water, after mixing evenly, pressing and molding to obtain a finished catalyst.

[0031] The content of each component in the catalyst obtained in Example 1 is Ni15%, Al 2 O 3 70%, La 2 O 3 4.5%, graphite 5%, the balance is water, a...

Embodiment 2

[0033] (1) Dissolve 61.9g nickel nitrate, 228.0g aluminum nitrate, 4.0g lanthanum nitrate, 16.0g magnesium nitrate in 1000mL water;

[0034] (2) adding the above-mentioned aqueous solution to the reactor, stirring, heating to 70 ° C, then adding 1200 mL of ammonium oxalate solution with a concentration of 0.65 mol / L, and adjusting the pH to 7 with 10% ammonia, washing and filtering to obtain a catalyst semi-finished product;

[0035] (3) drying the obtained semi-finished product at 150°C for 10h;

[0036] (4) Put the dried material in inert gas N 2 Roasting under protection for 3h, the roasting temperature is 400℃;

[0037] (5) be cooled to 120 ℃, pass a small amount of air to passivate the product after roasting;

[0038] (6) Mixing 5% graphite and a small amount of water, after mixing evenly, pressing and molding to obtain a finished catalyst.

[0039] The content of each component in the catalyst obtained in Example 2 is Ni23%, Al 2 O 3 60%, La 2 O 3 2.5%, MgO 4.5%, ...

Embodiment 3

[0041] (1) Dissolve 74.3g nickel nitrate, 202.3g aluminum nitrate, 16.0g magnesium nitrate, 10.5g calcium nitrate in 1200mL water;

[0042] (2) adding the above-mentioned aqueous solution to the reactor, stirring, heating to 70 ° C, then adding 1500 mL of oxalic acid solution with a concentration of 0.54 mol / L, and adjusting the pH to 7 with 10% ammonia, washing and filtering to obtain a catalyst semi-finished product;

[0043] (3) drying the obtained semi-finished product at 150°C for 10h;

[0044] (4) Put the dried material in inert gas N 2 Roasting under protection for 3h, the roasting temperature is 450℃;

[0045] (5) be cooled to 120 ℃, pass a small amount of air to passivate the product after roasting;

[0046] (6) Mixing 5% graphite and a small amount of water, after mixing evenly, pressing and molding to obtain a finished catalyst.

[0047] The content of each component in the catalyst obtained in Example 3 is Ni28%, Al 2 O 3 51%, MgO4.5%, CaO4.5%, graphite 5%, an...

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Abstract

The invention discloses a pre-reduction type high-temperature methanation catalyst. The catalyst comprises an active component, a carrier and an auxiliary, wherein the active component is reduction state nickel, the carrier is Al2O3, and the auxiliary is one or more of Mg oxide, Ca oxide, Ba oxide and La oxide. The invention further discloses a preparation method of the catalyst. The preparation method comprises the steps that nickel nitrate, aluminum nitrate and soluble salt of the auxiliary oxide are prepared into an aqueous solution, the prepared aqueous solution is added into a reaction kettle, oxalate precipitator is added for stirring and heating, and a semi-finished catalyst is obtained after washing and filtering; calcination is conducted after drying, cooling passivating is conducted, graphite and water are added, the mixture is mixed evenly, and then the catalyst is obtained through compression molding. The pre-reduction type high-temperature methanation catalyst is prepared through the method of oxalate precipitating and inert atmosphere calcination and has high specific surface area, CO produced through oxalic acid decomposing is used for reduction, the reduction type catalyst is directly obtained, the reduction degree of the passivated finished product is 80% or above, plenty of time is saved, and using is convenient.

Description

technical field [0001] The invention belongs to the technical field of catalysts and their preparation, in particular to a pre-reduction type high temperature methanation catalyst, and the invention also relates to a preparation method of the catalyst. Background technique [0002] my country is a big producer of raw coal, and the coal-dominated energy structure is an important cause of my country's current serious air pollution. Natural gas has the characteristics of high combustion calorific value, low emission of harmful gases, and no solid particulate pollutants. It is a clean energy and accounts for about 24% of global energy consumption. my country's natural gas resources are relatively poor, and the proportion of natural gas in primary energy is low. In 2014, the value was 5.6%. Therefore, vigorously developing natural gas is conducive to improving my country's energy structure and alleviating the current serious environmental pollution problems. In the 13th Five-Ye...

Claims

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Application Information

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IPC IPC(8): B01J37/03B01J37/08B01J23/83B01J23/78C10L3/08
CPCB01J23/002B01J23/78B01J23/83B01J37/031B01J37/082B01J2523/00C10L3/08B01J2523/31B01J2523/22B01J2523/23B01J2523/3706
Inventor 彭东冯毅敏许龙龙金义
Owner XIAN SUNWARD AEROSPACE MATERIAL
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