Activated Carbon Processing with Ball Milling and CO2 Activation
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Solution Overview
Problem
Existing methods for preparing activated carbon, such as chemical and physical activation, are inefficient, require additional impurity removal processes, and pose explosion risks, limiting the improvement of specific surface area and pore structure, especially in carbon materials like CNTs.
Innovation Solution
A method involving pretreatment of a carbon aggregate precursor through ball milling and subsequent reaction with CO2, which includes steps of carbon dioxide, and activation, and activation of the carbon material with CO2, and a method for preparing activated carbon, which includes steps of pretreating a carbon aggregate precursor by ball milling and activating it with CO2, without using chemical substances, thereby improving the activation process's safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If chemical activation method is used to increase specific surface area and pore structure, then the specific surface area and pore structure are improved, but the process becomes cumbersome and requires separate impurity removal processes
Solution Approach 1:
The patent extracts and eliminates the impurity removal step from the conventional chemical activation process by using physical activation with CO2/steam, which does not generate salt impurities requiring separate removal processes
Solution Approach 2:
The patent replaces the chemical activation system (using KOH, NaOH, H3PO4, ZnCl2) with a physical activation system using CO2 and steam, substituting chemical reactions with physical oxidation processes to achieve activation without harmful byproducts
2Area of stationary object
If chemical activation method is used to increase specific surface area and pore structure, then the specific surface area and pore structure are improved, but there is a risk of explosion due to formation of metals such as K and Na
Solution Approach 1:
The patent converts the potentially harmful chemical activation process into a safe physical activation process by using CO2 and steam, which naturally oxidize carbon without forming explosive metal byproducts, thereby eliminating the explosion risk while maintaining activation effectiveness
Solution Approach 2:
The patent uses CO2 and steam as activation agents that create a controlled atmosphere without forming explosive metals, replacing the dangerous chemical environment with a safer physical oxidation environment
3Ease of manufacture
If physical activation method is used to activate carbon material, then the process is simpler, but the specific surface area and pore structure improvement is limited
Solution Approach 1:
The patent uses a composite activation approach combining CO2 and steam together, leveraging the complementary strengths of both agents: CO2 provides structural development while steam enhances surface area creation, achieving superior results compared to either agent alone
Solution Approach 2:
The patent optimizes activation parameters including temperature (700-900°C), gas flow rates, and treatment time to maximize the effectiveness of physical activation, thereby achieving high specific surface area and pore structure development through a simple process
4Ease of manufacture
If physical activation method is used to activate carbon material, then the process is simpler, but there is a risk of explosion due to use of oxygen gas and steam at high temperature
Solution Approach 1:
The patent uses CO2 as an inert-like atmosphere that provides oxidation capability without the explosive risks associated with pure O2, creating a safer activation environment while maintaining process simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method results in activated carbon with enhanced specific surface area and pore structure, maintaining electrical conductivity and mechanical strength, while avoiding the need for separate impurity removal and reducing explosion risks.
Implementation Method 1
pretreating a carbon aggregate precursor containing a number of linear carbons by ball milling
Implementation Method 2
activating the pretreated carbon aggregate precursor by reacting with CO2
Implementation Method 3
physical activation method is a process of activating a carbon material by oxidizing it using a CO2/O2 mixture, or O2 or H2O steam alone or in combination at a high temperature of 700°C to 900°C
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
The present invention relates to active carbon and a manufacturing method therefor and, more specifically, can manufacture active carbon having an improved specific surface area and pore structure by a process of pre-treating a carbon aggregate precursor containing a plurality of linear carbons through ball milling, followed by reaction with CO2.