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Catalyst for full methanation of carbon dioxide and preparation method thereof

A complete methanation and carbon dioxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, hydrocarbon production from carbon oxides, etc., to achieve good thermal stability, easy fluidization, and low cost Reduced effect

Active Publication Date: 2010-11-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of existing catalysts in catalytic carbon dioxide hydromethanation, and provide a catalyst for complete methanation of carbon dioxide

Method used

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  • Catalyst for full methanation of carbon dioxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 50g γ-Al2 o 3 The carrier was calcined in a muffle furnace at 550°C for 5 hours. Take Mg(NO 3 ) 2 ·6H 2 O15g, Ce(NO 3 ) 3 ·6H 2 O5g, dissolved in 20mL deionized water, stirred and dissolved to make impregnation solution. Pour the impregnation solution into the roasted γ-Al 2 o 3 In the carrier, the temperature was kept at 60°C for 5 hours, and then placed in an oven at 100°C for 8 hours, and then roasted in a muffle furnace with a heating rate of 2°C / min and a temperature of 550°C for 5 hours. Obtain a carrier sample of the impregnation aid component. Take Ni(NO 3 ) 2 ·6H 2 O 46.8g, Fe(NO 3 ) 3 9H 2 O23.2g, dissolved in 20mL deionized water, configured as an aqueous solution, and then mixed the aqueous solution with the carrier sample of the impregnation aid component, impregnated at 60°C for 5 hours, and then dried it in an oven at 100°C for 8 hours, and then roasted in a muffle furnace at a heating rate of 2°C / min at a temperature of 550°C for 5 ...

Embodiment 2

[0031] For the catalyst of Example 1, at a reaction temperature of 350°C and a system pressure of 5.0 MPa, the feed gas H 2 / CO 2 = Under the condition of 4.1, the volumetric space velocity of raw gas is 5000h -1 Under these conditions, the activity of the prepared catalyst for carbon dioxide hydromethanation was evaluated. Analyzed by gas chromatography, CO 2 The conversion rate is 99.2%, CH 4 Selectivity is 100%.

Embodiment 3

[0033] For the catalyst in Example 1, when the reaction temperature is 450°C, the system pressure is 4.0MPa, the feed gas H 2 / CO 2 = Under the condition of 4.1, the volumetric space velocity of raw gas is 10000h -1 Under these conditions, the activity of the prepared catalyst for carbon dioxide hydromethanation was evaluated. Analyzed by gas chromatography, CO 2 The conversion rate is 99.5%, CH 4 Selectivity is 100%.

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Abstract

The invention discloses a catalyst for full methanation of carbon dioxide, which belongs to the technical field of methanation of carbon dioxide. In the catalyst, spherical gamma-Al2O3 is used as a carrier, Ni and Fe are used as active ingredients, and MgO, La2O3 or CeO2 is used as an auxiliary agent. The catalyst is prepared by adopting an ordered soaking method through drying, roasting and reduction. The catalyst comprises the following components in percentage by mass: 60 to 80 percent of gamma-Al2O3, 10 to 20 percent of NiO, 5 to 15 percent of Fe2O3, 1 to 10 percent of MgO, and 1 to 10 percent of La2O3 or CeO2. Under the reaction conditions that the pressure is between 3.0 and 5.0MPa, the volume airspeed of the raw material gas is 5,000 to 10,000 per hour and the ratio of H2 to CO2 is 4.1, both the CO2 conversion rate and the CH4 selectivity can be close to 100 percent. The catalyst has the characteristics of high strength, good thermal stability, carbon deposition resistance, easy fluidization and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide methanation, and in particular relates to a catalyst for complete carbon dioxide methanation and a preparation method thereof. The catalyst is mainly used to produce synthetic natural gas (SNG). Background technique [0002] As the main component of greenhouse gas, carbon dioxide has always attracted people's great attention to its impact on the environment. In my country, coal is the main body of primary energy consumption, and controlling carbon dioxide emissions is particularly important to ensure sustainable economic growth. In addition to the negative impact on the environment, carbon dioxide, as a cheap and abundant chemical raw material, has potential application value. In recent years, the capture, storage and reuse of carbon dioxide has become a research hotspot at home and abroad. [0003] In 1902, Sabatier first reported the catalytic hydrogenation reduction reaction of carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C07C1/12C07C9/04
Inventor 程易田大勇史慧亮
Owner TSINGHUA UNIV
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