Synthesis gas methanation catalyst and preparation thereof

The technology of catalyst and auxiliary agent is applied in the field of synthesis gas methanation catalyst and its preparation, which can solve the problems of easy sintering of active components and poor heat transfer effect of catalyst, and achieve the effects of avoiding over-temperature sintering and high activity stability.

Inactive Publication Date: 2012-01-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is a synthetic gas methanation catalyst and its preparation, aiming to solve the problem that the active components are easy to sinter at high temperature due to the poor

Method used

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  • Synthesis gas methanation catalyst and preparation thereof
  • Synthesis gas methanation catalyst and preparation thereof

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Experimental program
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Effect test

specific Embodiment approach 1

[0023] Weigh 1g of P123 and dissolve it in ethanol. After fully dissolving, add 2g of aluminum isopropoxide, stir at 40°C for 4h, place in a drying oven at 60°C for 48h at a constant temperature, and roast at 400°C for 4h to obtain mesoporous alumina. The specific surface area 329.5m 2 / g, pore volume 0.485cm3 / g, pore diameter 4.9nm. Weigh 2.48 grams of nickel nitrate and 0.95 grams of cerium nitrate to prepare solutions respectively, immerse 2.5 grams of mesoporous alumina carrier in the solution of cerium nitrate, dry at 100°C for 3 hours, and roast at 450°C for 2 hours, then Immerse in a nickel nitrate solution, dry the impregnated sample at 120°C for 2 hours, and calcinate at 450°C for 4 hours to obtain a supported nickel catalyst; then immerse it in a solution prepared with 0.6 g of iridium nitrate, and dry the impregnated sample at 120°C 2h, calcination at 500°C for 4h to obtain a modified catalyst, which is pressed into tablets to obtain catalyst particles of 40-60 mesh...

specific Embodiment approach 2

[0024] According to the same method as in Embodiment 1, a mesoporous alumina-supported nickel catalyst was synthesized. Then it was immersed in a solution prepared with 0.4 g of magnesium nitrate. The impregnated sample was dried at 120° C. for 3 hours and calcined at 500° C. for 3 hours to obtain a modified catalyst, which was pressed into tablets to obtain catalyst particles of 40-60 mesh. For the methanation reaction of syngas, the temperature is 400°C, the pressure is 1.5MPa, and the space velocity is 9000h -1 , H in syngas 2 The / CO ratio was 3. During the reaction time of 200 hours, the conversion rate of carbon monoxide was 90%, and the selectivity of methane was 100%.

specific Embodiment approach 3

[0025] Weigh 1g of P123 and dissolve it in ethanol. After fully dissolving, add 2.5g of aluminum isopropoxide, stir at 40°C for 4h, place in a drying oven at 60°C for 48h at a constant temperature, and roast at 400°C for 4h to obtain mesoporous alumina. Surface area is 254.2m 2 / g, pore volume 0.405cm3 / g, pore diameter 3.42nm. . Weigh 2.48 grams of nickel nitrate and 0.95 grams of cerium nitrate to prepare solutions respectively. First, immerse 2.5 grams of mesoporous alumina carrier in the solution of cerium nitrate. After impregnation, the sample is dried at 120°C for 2 hours, and then roasted at 450°C. Then it is immersed in the nickel nitrate solution, the sample after immersion is dried at 120°C for 2h, and roasted at 450°C for 4h to obtain the supported nickel catalyst; Drying at ℃ for 3 hours, calcining at 500 ℃ for 4 hours to obtain a modified catalyst, and pressing it into tablets to obtain catalyst particles of 40-60 mesh. For the methanation reaction of syngas, t...

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Abstract

The invention relates to a synthesis gas methanation catalyst, which uses nickel oxide as active ingredients, uses cerium oxide modified medium-pore gamma-aluminum oxide as carriers and use oxide of transition metals of iridium, lanthanum, copper and ferrum or alkaline-earth metals of magnesium and calcium as auxiliary agents, wherein a preparation method of the medium-pore gamma-aluminum oxide adopts a hydrothermal synthesis method, and a nickel base catalyst is prepared by a soaking process, wherein the medium-pore gamma-aluminum oxide has the specific surface area being 200 to 400m<2>/g, the pore volume being 0.2 to 0.9cm<3>/g and the pore diameter being 2 to 15nm, the content of the active ingredients of the nickel oxide is 10 to 30 percent of the total weight of the catalyst, the content of the cerium oxide is 1 to 20 percent of the weight of the aluminum oxide, and the content of the auxiliary agents is 0.1 to 15 percent of the total weight of the catalysts. The synthesis gas methanation catalyst has the advantages that the preparation process is simple, the cerium oxide modified medium-pore gamma-aluminum oxide is used as the catalyst carriers, the obtained nickel base catalyst has good high-temperature resistance and anti-sintering resistance performance and has the advantages of high activity at low temperature, stability at high temperature and high methane selectivity, and the synthesis gas methanation catalyst has an important application value for synthesizing the substitute natural gas and solving the problem of natural gas shortage in the prior art.

Description

technical field [0001] The invention relates to a synthesis gas methanation catalyst and its preparation, which belong to the field of preparation and application of catalysts, and in particular relate to a catalyst which uses mesoporous γ-alumina as a carrier and can be used for coal-based synthesis gas to directly synthesize methane . Background technique [0002] The efficient and green utilization of fossil resources is an important long-term research content. As a clean, efficient and green gas energy, natural gas has high calorific value and low pollution. However, natural gas reserves in my country are not abundant. Using coal-based substitute natural gas (Substitute Natural Gas-SNG) can efficiently and cleanly make full use of my country's abundant lignite and other low-quality coal resources to synthesize natural gas that is short of energy and meet domestic demand for natural gas [China and Foreign Energy. 2010, 15 (6) : 28; Fertilizer Design 2010, 48(2): 19]. It...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/83C07C9/04C07C1/04
Inventor 李瑞丰杜建平马静红于峰范彬彬王琰程文萍
Owner TAIYUAN UNIV OF TECH
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