Bifunctional catalyst applied to integration of CO2 capture and methanation in flue gas

A dual-function catalyst and methanation technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, gas fuels, etc., can solve the problems of high catalyst cost, expensive precious metals, and multi-energy

Pending Publication Date: 2021-11-12
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, there is an adsorption-desorption process in carbon capture technology, while traditional adsorbent regeneration steps need to consume more energy (CO 2 desorption process)
In addition, the existing CCS technology also has the following two problems: 1. The transport of captured CO 2 Insufficient infrastructure; 2.CO 2 Storage technology is not mature enough
Based on the above related studies, on the one hand, due to the high price of noble metals, the cost of preparing catalysts is high, which is not suitable for large-scale industrial production applications; 2 ability to rapidly decrease

Method used

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  • Bifunctional catalyst applied to integration of CO2 capture and methanation in flue gas
  • Bifunctional catalyst applied to integration of CO2 capture and methanation in flue gas
  • Bifunctional catalyst applied to integration of CO2 capture and methanation in flue gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1.Ni / CaO catalyst is applied to CO in flue gas 2 Capture-methanation integrated reaction

[0029] (1) Catalyst preparation

[0030] 1. Preparation of Vector

[0031] The carrier of the catalyst is prepared by a sol-gel method. Weigh 4.2112g of calcium nitrate tetrahydrate, dissolve it in 50mL of deionized water, add 8.6830g of ammonium citrate to the above solution, after fully dissolving, stir in an oil bath at 90°C until a gel is formed. Then the prepared gel was dried in an oven at 100°C for 12h, calcined in a muffle furnace at 800°C for 4h, and the heating rate was 10°C / min, and finally the CaO support was obtained.

[0032] 2. Catalyst Preparation

[0033] The catalyst is prepared by impregnation method. Weigh 0.4955 g of nickel nitrate hexahydrate, dissolve it in 30 mL of absolute ethanol, and add 1.0000 g of the CaO carrier prepared above. Magnetically stirred at 25°C for 3h, evaporated to dryness in a water bath at 90°C, dried in an oven at 100°...

Embodiment 2

[0037] Embodiment 2.Ni / MgCaO catalyst is applied to CO in flue gas 2 Capture-methanation integrated reaction

[0038] (1) Catalyst preparation

[0039] 1. Preparation of Vector

[0040] The carrier of the catalyst is prepared by a sol-gel method. Weigh 4.2112g of calcium nitrate tetrahydrate and 1.0667g of magnesium nitrate hexahydrate, dissolve them in 50mL of deionized water, add 8.6830g of ammonium citrate to the above solution, after fully dissolving, stir in an oil bath at 90°C until a gel is formed . Then the prepared gel was dried in an oven at 100°C for 12h, calcined in a muffle furnace at 800°C for 4h, and the heating rate was 10°C / min, and finally the MgCaO support was obtained.

[0041] 2. Catalyst preparation

[0042] The catalyst is prepared by impregnation method. Weigh 0.4955 g of nickel nitrate hexahydrate, dissolve it in 30 mL of absolute ethanol, and add 1.1000 g of the above-prepared MgCaO carrier. Stir magnetically at 25°C for 3h, evaporate to drynes...

Embodiment 3

[0046] Embodiment 3.Ni / ZrCaO catalyst is applied to CO in flue gas 2 Capture-methanation integrated reaction

[0047] (1) Catalyst preparation

[0048] 1. Preparation of Vector

[0049] The carrier of the catalyst is prepared by a sol-gel method. Weigh 4.2112g of calcium nitrate tetrahydrate and 0.4706g of zirconium nitrate pentahydrate, dissolve them in 50mL of deionized water, add 8.6830g of ammonium citrate to the above solution, after fully dissolving, stir in an oil bath at 90°C until a gel is formed . Then the prepared gel was dried in an oven at 100°C for 12h, calcined in a muffle furnace at 800°C for 4h at a heating rate of 10°C / min, and finally the ZrCaO support was obtained.

[0050] 2. Catalyst preparation

[0051] The catalyst is prepared by impregnation method. Weigh 0.4955 g of nickel nitrate hexahydrate, dissolve it in 30 mL of absolute ethanol, and add 1.1000 g of the ZrCaO carrier prepared above. Stir magnetically at 25°C for 3h, evaporate to dryness in...

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PUM

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Abstract

The invention discloses a bifunctional catalyst applied to integration of CO2 capture and methanation in flue gas, which takes a Ni base as a main catalyst, takes a CaO base as a main carrier, and promotes and improves the CO2 yield, the catalytic activity and the cycle stability of the bifunctional catalyst by adding three factors such as an auxiliary agent, a template agent and a high-temperature-resistant element. The invention provides the bifunctional catalyst which is low in cost, small in energy consumption and sustainable in circulation, and the catalyst has high CO2 yield of 15.5 mmol/g, and still keeps 99% of CO2 conversion rate and 100% of CH4 selectivity after being circulated for 1000 hours.

Description

technical field [0001] The present application relates to the technical field of catalysts, in particular to a CO catalyst used in flue gas 2 A capture-methanation integrated bifunctional catalyst and a preparation method thereof. Background technique [0002] Since the industrial revolution, climate change characterized by global warming has seriously threatened the living environment of human beings and the sustainable development of social economy. Reducing greenhouse gas emissions and curbing global warming has become a core measure for the global response to climate change. Countries around the world have adopted a global agreement to reduce greenhouse gas emissions (in terms of CO 2 Based on this), my country proposed the goal of carbon peak and the vision of carbon neutrality. There have been many researches on carbon capture and storage (CCS) technology, but there are technical, energy and cost problems in the practical application of CCS. For example, there is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C10L3/08C07C1/12C07C9/04
CPCB01J23/78C10L3/08C07C1/12C07C9/04
Inventor 赵晨赵培培田井清
Owner EAST CHINA NORMAL UNIV
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