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Novel methanation catalyst and preparation method thereof

A methanation catalyst, catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high cost and achieve good conversion rate and selectivity , the effect of simple operation steps

Inactive Publication Date: 2009-03-11
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US4331544 is a catalyst impregnated with nickel and molybdenum, and the cost is relatively high
US4238371 is mainly a copper-molybdenum methanation catalyst, which has high cost and is used under low methane concentration

Method used

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  • Novel methanation catalyst and preparation method thereof
  • Novel methanation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 500g of pseudo-boehmite, add 350ml of nitric acid solution with a mass percentage content of 2%, knead for 30 minutes, extrude into φ3 strips, dry at 120 ° C for 12 hours, and then calcine in a muffle furnace for 5 hours to obtain Catalyst carrier JWZ-1, carrier specific surface 194m 2 / g, pore volume 1.2ml / g, take 900g of nickel nitrate hexahydrate, 55g of lanthanum nitrate, 52g of magnesium nitrate, dissolve in 100ml of deionized water, put the carrier JWZ-1 into the dipping solution, keep the dipping temperature at 80 ℃, dipping After 6 hours, the remaining impregnating liquid was filtered off, put into an oven for 18 hours at 120 °C, and then placed in a muffle furnace for calcination. The heating rate was 4 °C / min, the temperature was 500 °C, and the constant calcination time was 4 hours. The methanation catalyst JW-1 was obtained. The specific surface is 146m2 / g, pore volume 0.44ml / g.

[0036] The reaction temperature is 300℃, the reaction pressure is 1MP...

Embodiment 2

[0038] Weigh 500g of pseudo-boehmite, add 150ml of acid nitrate solution with a mass percentage of 2%, weigh 55g of lanthanum nitrate, 45g of cerium nitrate, and 52g of magnesium nitrate, dissolve in 220ml of deionized water, and add to the pseudo-boehmite. The kneading time was 30min, extruded into φ3 strips, and then dried and calcined. The conditions were the same as in Example 1, and the carrier JWZ-2 was obtained with a specific surface area of ​​186m. 2 / g, pore volume 0.9ml / g. Dissolve 900 g of nickel nitrate in 110 ml of water, put the carrier JWZ-2 into the impregnation solution, keep the impregnation temperature at 50°C, and the impregnation time for 6 hours, then dry and calcine to obtain the catalyst JW-2 with the same conditions as Example 1. The specific surface area measured by BET is 167m 2 / g, pore volume 0.53ml / g.

[0039] The reaction conditions are the same as in Example 1, and the conversion rate of carbon monoxide is 100%, and the selectivity is 100%. ...

Embodiment 3

[0041] In the process of making the carrier in this example, 0.9g of calcium nitrate was added, and the preparation method was the same as that of Example 2, to obtain the carrier JWZ-3 with a specific surface of 193m. 2 / g, pore volume 0.87ml / g. The catalyst preparation method is the same as Example 2. Get catalyst JW-3

[0042] The catalyst specific surface is 166m 2 / g, pore volume 0.49ml / g.

[0043] The reaction conditions are the same as in Example 1, and it is determined that the conversion rate of carbon monoxide is 100%, the selectivity is 99.91%, the conversion rate of carbon dioxide is 99.90%, and the selectivity is 100%. The catalyst is subjected to a heat resistance test. After the test is run at 700° C. for 2 hours, the conversion rate of carbon monoxide is 100%, the selectivity is 100%, the conversion rate of carbon dioxide is 99.30%, and the selectivity is 100%.

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Abstract

The invention provides a novel methane catalyst and a preparation method thereof, which is characterized in that by adding rare earth elements of La and Ce during the process of the catalyst, the activity and selectivity of the catalyst are improved, and especially for the reaction that CO2 is carried out hydrogenation to be changed into methane, the conversion rate is higher. By adding an appropriate amount of Ca, Mg, Ba, Na and other alkali metals and alkaline earth metals, the thermal stability and the anti-carbon property of the catalyst are improved. The components of the catalyst by weight percentage are as follows: 70-86% ofAl2O3, 12-20% NiO, 0.5-5% of La2O3, 0.5-5% of MgO, 0.1-5% of CeO2, 0.1-3% of CaO, 0.1-1% of Na2O and 0.01-2% of BaO; the specific surface of the catalyst is 100-180m<2> / g, and the pore volume is 0.4- 0.8ml / g.

Description

technical field [0001] The invention relates to the field of carbon oxide methanation, in particular to a catalyst for methanation and a preparation method thereof. The catalyst is mainly used to produce high content methane products. Background technique [0002] The carbon oxide methanation reaction process is: carbon monoxide and carbon dioxide are converted into methane and water in a hydrogen reducing atmosphere. Its reaction formula is as follows: [0003] [0004] [0005] Carbon oxide methanation reaction is mainly used for gas purification in ammonia synthesis plants. Since carbon monoxide is toxic to ammonia synthesis catalysts and hydrogenation catalysts, it must be removed from the gaseous raw materials. Methanation is a convenient and economical gas. purification method, which is widely used in modern ammonia plants. [0006] Another application of the methanation reaction is to produce natural gas and city gas to increase the calorific value of the gas...

Claims

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Application Information

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IPC IPC(8): B01J23/83C07C1/04C07C9/04
Inventor 蒋建明李金来常俊石郭迎秋
Owner ENN SCI & TECH DEV
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