Method for preparing boron-doped porous carbon material with high specific surface area from biomass

Abstract

The invention relates to a method for preparing a high-specific-surface-area boron-doped porous carbon material from biomass, which comprises the following steps: pulverizing biomass into fine particles, proportionally and uniformly mixing the pulverized biomass particles with a boric acid-containing water solution to form a mixture, and putting the mixture into a hydrothermal reaction kettle to perform hydrothermal reaction; dehydrating and drying hydrothermal carbon obtained after the hydrothermal reaction; putting the dried hydrothermal carbon into a pyrolyzing furnace, and carrying out rapid pyrolysis under the protection of an inert atmosphere to obtain a biomass source boron-doped porous carbon material with high specific surface area after rapid pyrolysis; the method has the advantages of wide sources of raw materials, simple and green process, lower equipment requirements, short time consumption in the production process and high efficiency, and is suitable for industrial large-scale production.

Description

technical field

[0001] The invention belongs to the field of boron-doped carbon material preparation, especially the field of biomass preparation of boron-doped porous carbon material with high specific surface area. Background technique

[0002] Biomass is widely distributed in nature and has huge reserves, and it is the only carbon-neutral energy source that can replace petroleum-derived fuels and chemicals. China produces about 100 million tons of waste biomass (crop stalks, sawdust, weeds, microalgae, animal waste, etc.) every year. The energy contained in these waste biomass is equivalent to 100 million tons of standard coal, which is a huge treasure trove of resources. . Biomass can be converted into a solid substance containing a large number of aromatic ring structures through hydrothermal or pyrolysis technologies, that is, biochar, which has a very broad application prospect in the field of environment and chemical industry; in recent years, the application of car...

Examples

Embodiment 1

[0048] In this example, seven different types of biomass were selected for pulverization, and 5 g of the above-mentioned biomass powder were weighed for use, and seven different materials were prepared according to the following preparation methods;

[0049] A method for preparing a high specific surface area boron-doped porous carbon material from biomass, comprising the following steps:

[0050] Step 1, crushing the biomass into fine particles;

[0051] Step 2, select 5g of pulverized biomass particles and boric acid solution to mix the boron / carbon mass ratio of 1:1 to form a uniform mixture, and put the mixture into a hydrothermal reaction kettle with a volume of 100ml. After the reaction kettle is sealed, place it in a 200°C oven for 12 hours;

[0052] Step 3. After the hydrothermal reaction, take out the reaction kettle, and after the reaction kettle is cooled to room temperature, transfer the hydrothermal product to a beaker, and place it in an oven at 105°C for 24 hou...

Embodiment 2

[0059] In this example, the influence of different boron sources and acid sources on the properties of boron-doped biomass carbon materials was tested, only the types of boron sources and acid sources were changed, and the materials were prepared according to the following preparation method;

[0060] A method for preparing a high specific surface area boron-doped porous carbon material from biomass, comprising the following steps:

[0061] Step 1, the biomass of sycamore wood is pulverized into fine particles;

[0062] Step 2: Mix 5 g of crushed biomass particles with boron-containing acidic aqueous solution at a ratio of boron / carbon mass ratio of 1:1 to form a homogeneous mixture, and put the mixture into a hydrothermal reaction kettle with a volume of 100ml , seal the reactor and place it in a 200°C oven for 12 hours;

[0063] Step 3. After the hydrothermal reaction, take out the reaction kettle, and after the reaction kettle is cooled to room temperature, transfer the hy...

Embodiment 3

[0070] In this example, the influence of different boron-carbon ratios on the properties of boron-doped biomass carbon materials was tested, only the ratio of boron-carbon was changed, and the materials were prepared according to the following preparation method;

[0071] A method for preparing a high specific surface area boron-doped porous carbon material from biomass, comprising the following steps:

[0072] Step 1, the biomass of sycamore wood is pulverized into fine particles;

[0073] Step 2, select 5g of the pulverized biomass particles and boric acid solution to mix according to the ratio of boron / carbon mass ratio of 1:1 or 1:10 or 1:20 or 1:30 or 1:50 to form a uniform mixture, Put the mixture into a hydrothermal reaction kettle with a volume of 100ml, seal the reaction kettle and place it in an oven at 200°C for 12 hours;

[0074] Step 3. After the hydrothermal reaction, take out the reaction kettle, and after the reaction kettle is cooled to room temperature, tran...

technical field

[0001] The invention belongs to the field of boron-doped carbon material preparation, especially the field of biomass preparation of boron-doped porous carbon material with high specific surface area. Background technique

[0002] Biomass is widely distributed in nature and has huge reserves, and it is the only carbon-neutral energy source that can replace petroleum-derived fuels and chemicals. China produces about 100 million tons of waste biomass (crop stalks, sawdust, weeds, microalgae, animal waste, etc.) every year. The energy contained in these waste biomass is equivalent to 100 million tons of standard coal, which is a huge treasure trove of resources. . Biomass can be converted into a solid substance containing a large number of aromatic ring structures through hydrothermal or pyrolysis technologies, that is, biochar, which has a very broad application prospect in the field of environment and chemical industry; in recent years, the application of car...

Examples

Embodiment 1

[0048] In this example, seven different types of biomass were selected for pulverization, and 5 g of the above-mentioned biomass powder were weighed for use, and seven different materials were prepared according to the following preparation methods;

[0049] A method for preparing a high specific surface area boron-doped porous carbon material from biomass, comprising the following steps:

[0050] Step 1, crushing the biomass into fine particles;

[0051] Step 2, select 5g of pulverized biomass particles and boric acid solution to mix the boron / carbon mass ratio of 1:1 to form a uniform mixture, and put the mixture into a hydrothermal reaction kettle with a volume of 100ml. After the reaction kettle is sealed, place it in a 200°C oven for 12 hours;

[0052] Step 3. After the hydrothermal reaction, take out the reaction kettle, and after the reaction kettle is cooled to room temperature, transfer the hydrothermal product to a beaker, and place it in an oven at 105°C for 24 hou...

Embodiment 2

[0059] In this example, the influence of different boron sources and acid sources on the properties of boron-doped biomass carbon materials was tested, only the types of boron sources and acid sources were changed, and the materials were prepared according to the following preparation method;

[0060] A method for preparing a high specific surface area boron-doped porous carbon material from biomass, comprising the following steps:

[0061] Step 1, the biomass of sycamore wood is pulverized into fine particles;

[0062] Step 2: Mix 5 g of crushed biomass particles with boron-containing acidic aqueous solution at a ratio of boron / carbon mass ratio of 1:1 to form a homogeneous mixture, and put the mixture into a hydrothermal reaction kettle with a volume of 100ml , seal the reactor and place it in a 200°C oven for 12 hours;

[0063] Step 3. After the hydrothermal reaction, take out the reaction kettle, and after the reaction kettle is cooled to room temperature, transfer the hy...

Embodiment 3

[0070] In this example, the influence of different boron-carbon ratios on the properties of boron-doped biomass carbon materials was tested, only the ratio of boron-carbon was changed, and the materials were prepared according to the following preparation method;

[0071] A method for preparing a high specific surface area boron-doped porous carbon material from biomass, comprising the following steps:

[0072] Step 1, the biomass of sycamore wood is pulverized into fine particles;

[0073] Step 2, select 5g of the pulverized biomass particles and boric acid solution to mix according to the ratio of boron / carbon mass ratio of 1:1 or 1:10 or 1:20 or 1:30 or 1:50 to form a uniform mixture, Put the mixture into a hydrothermal reaction kettle with a volume of 100ml, seal the reaction kettle and place it in an oven at 200°C for 12 hours;

[0074] Step 3. After the hydrothermal reaction, take out the reaction kettle, and after the reaction kettle is cooled to room temperature, tran...

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