A kind of cobalt base catalyst and application for carbon dioxide methanation

A technology based on cobalt-based catalysts and carbon dioxide, which is applied in physical/chemical process catalysts, catalyst activation/preparation, and hydrocarbon production from carbon oxides, etc. It can solve the problems of high thermal conductivity, low conversion rate, and large heat release. , to achieve good low-temperature reactivity, good mechanical strength, good thermal conductivity and heat resistance

Active Publication Date: 2021-03-05
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

About the catalyzer of carbon dioxide methanation and preparation method, existing a large amount of research reports, the emphasis of research all is the nickel-based catalysis (as CN101884927A, CN1131582A, CN102416324A, CN101733104A etc.) The problem of deactivation due to the formation of nickel carbonyl, in CO 2 The problem is more prominent in the atmosphere, and the conversion rate is not high
Secondly, CO 2 The exothermic heat of the methanation reaction is large, and every conversion of 1% CO 2 The adiabatic temperature rise is 60°C, a large amount of heat of reaction can easily cause thermal sintering of the catalyst, which requires high heat resistance and thermal conductivity of the catalyst carrier, and the existing catalysts are made of alumina, silica, zirconia and molecular sieves. etc. as carriers (such as CN95103867.2, CN101757928, CN102600854A, CN101773833A), can not meet the requirements well; meanwhile, CO 2 The methanation process generates more water than CO methanation. Excessive water pressure poses great challenges to the hydrothermal stability, chemical stability and strength of the carrier. There are practical applications for alumina, silica and zirconia. question

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  • A kind of cobalt base catalyst and application for carbon dioxide methanation
  • A kind of cobalt base catalyst and application for carbon dioxide methanation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Prepare titanium carbide according to the method disclosed in Example 1 of patent CN102674350B, the average particle diameter of the prepared titanium carbide nanoparticles is 16nm, and the specific surface area is 197m 2 / g;

[0030] (2) According to the content of silicon dioxide and titanium carbide on the modified carrier in the final catalyst, weigh 1.72g of dimethylethoxysilane to prepare an ethanol solution and impregnate an equal volume in 100g of the above-mentioned titanium carbide, and then rotate at 100°C Evaporate until there is no volatile matter, and then roast at 400°C for 8 hours to obtain a modified titanium carbide carrier, the weight composition of which is silicon dioxide:titanium carbide=0.01:1;

[0031] (3) According to the content of cobalt carbide in the final catalyst, weigh 90.47g of cobalt nitrate hexahydrate, dissolve and impregnate the above-mentioned modified titanium carbide carrier in equal volume, then dry at 100°C for 24h, and then...

Embodiment 2

[0036] (1) Prepare titanium carbide according to the method disclosed in Example 2 of the patent CN102674350B, the average particle diameter of the prepared titanium carbide nanoparticles is 23nm, and the specific surface area is 136m 2 / g;

[0037] (2) According to the content of silicon dioxide and titanium carbide of the modified carrier in the final catalyst, take 4.51g of trimethylsilanol to prepare an ethanol solution and impregnate an equal volume in 100g of the above-mentioned titanium carbide, and then rotate evaporate at 120°C to No volatile matter, then calcined at 500°C for 6 hours to obtain a modified titanium carbide carrier, the weight composition of which is silicon dioxide:titanium carbide=0.03:1;

[0038] (3) According to the content of cobalt carbide in the final catalyst, weigh 115.32g of cobalt nitrate hexahydrate, dissolve and impregnate the above-mentioned modified titanium carbide carrier in equal volume, then dry at 110°C for 16h, and then roast at 300...

Embodiment 3

[0043] (1) Prepare titanium carbide according to the method disclosed in Example 3 of the patent CN102674350B, the average particle diameter of the prepared titanium carbide nanoparticles is 25nm, and the specific surface area is 121m 2 / g;

[0044] (2) According to the content of silicon dioxide and titanium carbide on the modified carrier in the final catalyst, weigh 9.86g of trimethylethoxysilane to prepare an ethanol solution and impregnate an equal volume in 100g of the above-mentioned titanium carbide, then rotate at 130°C Evaporate until there is no volatile matter, and then bake at 600°C for 5 hours to obtain a modified titanium carbide carrier, the weight composition of which is silicon dioxide:titanium carbide=0.05:1;

[0045] (3) According to the content of cobalt carbide in the final catalyst, weigh 120.72g of cobalt acetate tetrahydrate, dissolve and impregnate the above-mentioned modified titanium carbide carrier in equal volume, then dry at 120°C for 12h, and th...

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Abstract

Disclosed is a cobalt-based catalyst for carbon dioxide methanation. The catalyst is prepared by conducting equivalent-volume impregnation on cobalt oxide, cobalt carbide and modified titanium carbideaccording to the weight ratio of (0.4-0.8):(0.2-0.4):1. The cobalt-based catalyst has the advantages of long service life, good reactivity, hydrothermal stability and thermal conductivity and high mechanical strength.

Description

technical field [0001] The invention relates to a catalyst, specifically a cobalt-based catalyst for methanation of carbon dioxide and its application, belonging to the technical field of catalysts. [0002] technical background [0003] CO 2 It is one of the main gases that cause the greenhouse effect and is also an important potential carbon resource. CO 2 The process of emission reduction and resource utilization is imminent; on the other hand, the serious shortage of natural gas has become the bottleneck of national economic development, so CO 2 Catalytic hydromethanation is CO 2 effective way to utilize resources. [0004] At present, there is no mature CO 2 For methanation technology, companies with CO methanation technology have been reported to include Davey (UK), Topsoe (Denmark) and Lurgi (Germany). About the catalyzer of carbon dioxide methanation and preparation method, existing a large amount of research reports, the emphasis of research all is the nickel-ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/22B01J37/02B01J37/08B01J37/18C07C1/12C07C9/04
CPCB01J27/22B01J37/0201B01J37/082B01J37/18C07C1/12C07C9/04
Inventor 智翠梅王齐赵玉英高成云胡建水
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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