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A tubular structure for directly converting the mixed gas of carbon dioxide and water vapor into methane-rich gas, its preparation method and application

A technology of carbon dioxide and water vapor, applied in the direction of hydrocarbon production from carbon oxides, organic chemistry, electrodes, etc., can solve the problem of low methane generation efficiency in the co-electrolysis efficiency of the sheet single cell system

Active Publication Date: 2017-06-16
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the co-electrolysis system is an endothermic process, the system needs to work at a high temperature (700-1000°C), while the methanation process is an exothermic process and needs to work at a low temperature (200-300°C). The overall co-electrolysis efficiency and methane production efficiency are at a low level

Method used

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  • A tubular structure for directly converting the mixed gas of carbon dioxide and water vapor into methane-rich gas, its preparation method and application
  • A tubular structure for directly converting the mixed gas of carbon dioxide and water vapor into methane-rich gas, its preparation method and application
  • A tubular structure for directly converting the mixed gas of carbon dioxide and water vapor into methane-rich gas, its preparation method and application

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Embodiment 1

[0068] In this embodiment, the tubular structure is first prepared according to the following steps:

[0069] 1. Mix N-methylpyrrolidone (NMP), polyethersulfone (PESf) and polyvinylpyrrolidone (PVP) at a mass ratio of 20:4:1 to form a polymer solution; use YSZ powder as fuel electrode powder by Add the mass ratio of 1:1 to the polymer solution and mix, stir evenly to form a fuel electrode slurry; add the graphite powder to the polymer solution at a mass ratio of 1:2.3 and mix, stir evenly to form a graphite slurry; Insert a 0.5cm tubular mold into the graphite slurry, pull it out evenly and put it in water until it solidifies, then insert it into the fuel electrode slurry, pull it out evenly, immerse it in ethanol for 1 minute, and then put it in water to solidify for 12 hours. Demoulding to obtain a fuel electrode green body (8 cm); drying the fuel electrode green body at 90°C, and then heat-treating it at 1200°C for 2 hours, to obtain a porous ceramic fuel electrode as a sup...

Embodiment 2

[0079] 1. Mix N-methylpyrrolidone (NMP), polyethersulfone (PESf) and polyvinylpyrrolidone (PVP) at a mass ratio of 20:4:1 to form a polymer solution; use YSZ powder as fuel electrode powder by Add the mass ratio of 1:1 to the polymer solution and mix, stir evenly to form a fuel electrode slurry; add the graphite powder to the polymer solution at a mass ratio of 1:2.3 and mix, stir evenly to form a graphite slurry; Insert a 0.5cm tubular mold into the graphite slurry, pull it out evenly and put it in water until it solidifies, then insert it into the fuel electrode slurry, pull it out evenly, immerse it in ethanol for 1 minute, and then put it in water to solidify for 6 hours. Demoulding to obtain a fuel electrode green body (8 cm); drying the fuel electrode green body at 90°C, and then heat-treating it at 1200°C for 2 hours, to obtain a porous ceramic fuel electrode as a support of a tubular structure;

[0080] 2. Disperse YSZ powder in ethanol at a mass ratio of 1:10 to form ...

Embodiment 3

[0090] 1. Mix N-methylpyrrolidone, polyethersulfone, and polyvinylpyrrolidone in a mass ratio of 20:4:1 to form a polymer solution;

[0091] Select analytically pure lanthanum oxide (La 2 o 3 ), analytically pure strontium nitrate (Sr(NO 3 ) 2 ), analytically pure chromium nitrate nonahydrate (Cr(NO 3 ) 3 9H 2 O), analytically pure manganese acetate tetrahydrate (Mn(C 2 h 3 o 2 ) 2 4H 2 O) as raw material, according to the stoichiometric ratio of 0.75:0.25:0.5:0.5 accurately weighed and dissolved in nitric acid solution, adding ethylenediaminetetraacetic acid (EDTA) and citric acid as complexing agent, EDTA, citric acid and metal ion mole The ratio is 0.8:1:1, stir at a constant speed, add ammonia water to adjust the pH value to 6-9, and form a clear solution. Put the above-prepared solution on the stove and evaporate to dryness to obtain a black gel; pre-fire it in a muffle furnace at 1000°C for 2 hours to remove organic matter and prepare La 0.75 Sr 0.25 Cr 0.5...

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Abstract

The invention discloses a tubular structure for directly converting a gas mixture of carbon dioxide and water vapor into methane-rich gas, a preparation method thereof and an application thereof. The tubular structure is characterized by being an integrated structure which comprises a high-temperature solid oxide electrolytic cell unit and a low-temperature methanation catalytic reactor unit; the tubular structure takes a tubular porous ceramic fuel electrode as a supporting body, and a compact electrolyte layer covers the outer surface of the fuel electrode; the outer surface, positioned on the high-temperature solid oxide electrolytic cell unit, of the electrolyte layer is coated with a porous ceramic air electrode; and the fuel electrode is distributed with a methanation catalyst and an electrolysis catalyst. The tubular structure can complete two processes of high-temperature carbon dioxide and water vapor co-electrolysis and low-temperature methanation catalysis in one system; and the high-temperature solid oxide electrolytic cell unit can improve the conversion rate and the electrolysis efficiency of carbon dioxide and water vapor, and the low-temperature methanation catalytic reactor unit can improve the conversation of carbon dioxide and carbon monoxide, so that the yield of methane is increased.

Description

technical field [0001] The invention belongs to the field of sustainable recovery of carbon dioxide and water to prepare hydrocarbon fuels, and in particular relates to a method of realizing high-temperature co-electrolysis of carbon dioxide and water vapor in a tubular structure to prepare synthesis gas, and the synthesis gas is methanated to prepare methane the process of. Background technique [0002] The excessive reliance on fossil fuels in the development of industrial technology has led to a sharp increase in the carbon dioxide content in the atmosphere, triggering a global greenhouse effect. In addition, the excessive consumption of non-renewable energy including coal and oil has made energy shortage and environmental pollution the two major problems facing the development of human civilization. In order to solve the energy crisis and reduce carbon dioxide emissions, governments of various countries have promoted the development of new energy technologies. On the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C25B1/04C25B11/03C25B11/06C07C9/04C07C1/02
CPCY02E60/36
Inventor 夏长荣李一航陈龙
Owner UNIV OF SCI & TECH OF CHINA