Preparation method of phosphotungstic acid catalyzed hemp stalk core hydrothermal carbon material
A technology of phosphotungstic acid catalyzing Han and hemp stalk cores, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve problems such as unsatisfactory utilization of hemp stalk cores, and achieve mild conditions and high specific capacitance. , the effect of high specific surface area
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Embodiment 1
[0025] In this embodiment, a preparation method of phosphotungstic acid catalyzed hemp stalk core hydrothermal carbon material is carried out according to the following steps:
[0026] Step 1. Soak the hemp stalk core in 5wt% NaOH solution for 5 hours, then wash it with a large amount of deionized water until the solution is neutral, then dry it at 105°C for 24 hours, and crush it through a 200-mesh sieve to obtain the hemp stalk core powder.
[0027] Step 2: Add 4g of hemp stalk core powder to the PTFE lining with a volume of 100ml, then add 50ml of deionized water and 0.4g of phosphotungstic acid catalyst, stir evenly, and then seal the PTFE lining The high-pressure reactor was heated to 290 °C in a muffle furnace at a heating rate of 5 °C / min, treated at a constant temperature for 5 h, and then naturally cooled to room temperature.
[0028] Step 3: Collect the solid product of the hydrothermal carbonization reaction by filtration, wash with deionized water and ethanol seve...
Embodiment 2
[0032] In this embodiment, a preparation method of phosphotungstic acid catalyzed hemp stalk core hydrothermal carbon material is carried out according to the following steps:
[0033] Step 1. Soak the hemp stalk core in 5wt% NaOH solution for 5 hours, then wash it with a large amount of deionized water until the solution is neutral, then dry it at 105°C for 24 hours, and crush it through a 200-mesh sieve to obtain the hemp stalk core powder.
[0034] Step 2: Add 4g of hemp stalk core powder to the PTFE lining with a volume of 100ml, then add 50ml of deionized water and 0.8g of phosphotungstic acid catalyst, stir evenly, and then seal the PTFE lining The high-pressure reactor was heated to 290 °C in a muffle furnace at a heating rate of 5 °C / min, treated at a constant temperature for 5 h, and then naturally cooled to room temperature.
[0035] Step 3: Collect the solid product of the hydrothermal carbonization reaction by filtration, wash with deionized water and ethanol seve...
Embodiment 3
[0039] In this embodiment, a kind of hemp stalk core is used as raw material, and the preparation of porous carbon with high specific surface area by hydrothermal carbonization is carried out according to the following steps:
[0040] Step 1. Soak the hemp stalk core in 5wt% NaOH solution for 5 hours, then wash it with a large amount of deionized water until the solution is neutral, then dry it at 105°C for 24 hours, and crush it through a 200-mesh sieve to obtain the hemp stalk core powder.
[0041] Step 2: Add 4g of hemp stalk core powder to the PTFE lining with a volume of 100ml, then add 50ml of deionized water and 1.2g of phosphotungstic acid catalyst, stir evenly, and then seal the PTFE lining The high-pressure reactor was heated to 290 °C in a muffle furnace at a heating rate of 5 °C / min, treated at a constant temperature for 5 h, and then naturally cooled to room temperature.
[0042] Step 3: Collect the solid product of the hydrothermal carbonization reaction by filt...
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