Preparation method of coal-based high-performance activated carbon material for CO2 adsorption

Abstract

The invention discloses a preparation method of a coal-based high-performance activated carbon material for CO2 adsorption, a binary composite catalyst is doped in a carbonization stage of an activated carbon preparation process, so that the CO2 adsorption performance and gas adsorption selectivity of the activated carbon are efficiently enhanced, the binary composite catalyst is a sodium and iron bimetallic composite catalyst, and the carbon dioxide adsorption performance and the gas adsorption selectivity of the activated carbon are improved. The molar mass input ratio of sodium to iron is 1: 0.5-1: 2, the carbonization temperature in the activated carbon preparation process is 600-700 DEG C, and the activation temperature is 600-950 DEG C. According to the preparation method, in the carbonization process, the catalyst expands the pore structure of the activated carbon, the activation energy required by the carbonization reaction is reduced, the overall carbon yield can be improved by 5%-10%, the activated carbon product subjected to catalytic carbonization and activation has a high specific surface area and a developed pore structure, the CO2 saturation adsorption capacity is larger than or equal to 5.0 mmol/g, and the CO2 saturation adsorption capacity is larger than or equal to 4.5 mmol/g after three times of regeneration cycle or more; the preparation method of the activated carbon is simple in overall technological process, and the composite catalyst is excellent in dispersity and catalytic activity and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of chemical carbonaceous materials, in particular to a coal-based high-performance CO 2 Preparation method of activated carbon material for adsorption and CO in coal-fired flue gas in electric power, steel and other industries 2 of high-efficiency capture applications. Background technique [0002] In recent years, CO 2 Emissions have caused many ecological and environmental problems. It can be seen from the global warming potential and the trend of temperature changes that the largest "contribution" to the greenhouse effect is CO 2 , with the continuous acceleration of the industrialization process, its concentration in the atmosphere has a tendency to increase rapidly. As the main energy source in my country, coal is mainly used in large-scale combustion equipment such as thermal power generation. In the process of energy economic transformation, the clean and efficient utilization of fossil energy will still be ...

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Problems solved by technology

[0004] Although about CO 2 The research on adsorption materials has made a lot of progress, but there are still bottleneck problems such as high cost, low adsorption efficiency, and poor cycle adsorption performance in industrial applications.

good CO 2 The adsorption material should have a high carbon yield, large specific surface area, pore volume and rich microporous structure. However, the carbonization temperature of the existing technology is generally 800-900°C, the reaction time is 2-3h, and the carbonization reaction temperature is high. For a long time, the porosity of most activated carbon materials obtained by direct carbonization is low, and a strong corrosive activator needs to be introduced to increase the specific surface area. At the same time, the carbonization rate of coal-based activated carbon after carbonization and activation is not high, generally only 30% %–50%

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