Preparation method of high-adsorptive selectivity activated carbon for separating CO2 and CH4
A selective and activated carbon technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as limited demand and effect, and achieve the effect of increasing specific content, good separation effect, and excellent separation effect
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Embodiment 1
[0008] One for the separation of CO 2 and CH 4 The preparation method of activated carbon with high adsorption selectivity uses wood particles as raw materials, carbonizes at 450-600°C under inert gas conditions, puts the carbonized material in an activation furnace, and passes through 10wt% hydrazine hydrate aqueous solution at 800°C to decompose Steam activation treatment for 2 hours, then cooled to room temperature under the protection of inert gas, boiled with water, washed and dried, the obtained activated carbon was at 25°C, 100kPa for CO 2 The adsorption capacity is 2.4mmol / g, under normal temperature and pressure for CO 2 and CH 4 The separation factor was 8.9. Compared with the comparative example (using water vapor as the activator), the effect of activated carbon on CO 2 The adsorption capacity and the CO 2 / CH 4 The adsorption selectivity has been greatly improved.
Embodiment 2
[0012] One for the separation of CO 2 and CH 4 The preparation method of activated carbon with high adsorption selectivity uses wood particles as raw materials, carbonizes at 450-600°C under inert gas conditions, puts the carbonized material in an activation furnace, and decomposes it by passing 20wt% hydrazine hydrate aqueous solution at 700°C Steam activation treatment for 1 hour, then cooled to room temperature under the protection of inert gas, boiled with water, washed and dried. The obtained activated carbon is CO 2 The adsorption capacity is 1.8mmol / g, under normal temperature and pressure for CO 2 and CH 4 The separation factor was 2.3. Compared with the comparative example (using water vapor as the activator), the effect of activated carbon on CO 2 The adsorption capacity and the CO 2 / CH 4 The adsorption selectivity has been greatly improved.
Embodiment 3
[0016] One for the separation of CO 2 and CH 4 The preparation method of activated carbon with high adsorption selectivity, using coconut shell as raw material, carbonizing under inert gas conditions at 450-600°C, placing the carbonized material in an activation furnace, and passing 20wt% hydrazine hydrate aqueous solution at 800°C to decompose Steam activation treatment for 2 hours, then cooled to room temperature under the protection of inert gas, boiled with water, washed and dried. The obtained activated carbon is CO 2 The adsorption capacity is 2.8mmol / g, under normal temperature and pressure for CO 2 and CH 4 The separation factor was 9.6. Compared with the comparative example (using water vapor as the activator), the effect of activated carbon on CO 2 The adsorption capacity and the CO 2 / CH 4 The adsorption selectivity has been greatly improved.
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