Activated Carbon Surface Area via Weak Salt Activation
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Solution Overview
Problem
The production of activated carbons with high surface areas using chemical activation methods often involves strong acids or bases, which cause corrosion of processing facilities and are environmentally unfriendly, while weaker activation agents result in lower surface areas and higher costs.
Innovation Solution
A method using preferred combinations of chemical activation agents derived from weak acidic salts, weak basic salts, and neutral salts, such as potassium carbonate, potassium bicarbonate, or potassium chloride, and phosphates, to achieve high surface areas without strong acids or bases, minimizing corrosion and improving recovery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If strong acids or bases are used as chemical activation agents, then high surface areas can be achieved, but corrosion of processing facilities occurs and environmental friendliness deteriorates
Solution Approach 1:
The patent replaces expensive, corrosive strong acids and bases with inexpensive, non-corrosive weak acidic salts, weak basic salts, and neutral salts. These alternative activation agents achieve the required surface areas without causing corrosion to processing facilities, effectively substituting harmful materials with benign ones that complete their function and can be easily disposed of or recovered.
Solution Approach 2:
The patent changes the chemical parameters of the activation agents from strong acids/bases to weak acidic salts, weak basic salts, and neutral salts. This parameter change maintains the activation functionality while eliminating the corrosive harmful factors, allowing high surface areas to be achieved through controlled chemical reactions without facility corrosion.
2Area of stationary object
If strong acids or bases are used as chemical activation agents, then high surface areas can be achieved, but environmental friendliness deteriorates
Solution Approach 1:
The patent substitutes environmentally harmful strong acids and bases with environmentally benign weak acidic salts, weak basic salts, and neutral salts. These alternative agents achieve the same activation function without generating harmful environmental byproducts, making the process eco-friendly while maintaining high surface area production.
Solution Approach 2:
The patent converts the previously harmful strong acids and bases into beneficial weak acidic salts, weak basic salts, and neutral salts. These alternative agents provide the necessary chemical activation function while being environmentally friendly, effectively turning a harmful process into a beneficial one.
3Object-affected harmful factors
If weaker activation agents are used to avoid corrosion, then environmental friendliness improves, but surface areas decrease
Solution Approach 1:
The patent employs composite activation systems using combinations of weak acidic salts, weak basic salts, and neutral salts together with controlled physical activation conditions. This composite approach enables weaker agents to achieve high surface areas through synergistic effects, overcoming the limitation of individual weak agents while maintaining non-corrosive properties.
Solution Approach 2:
The patent optimizes multiple parameters including temperature, time, and agent combinations to enable weak acidic salts, weak basic salts, and neutral salts to achieve high surface areas. By changing and optimizing these parameters, the weaker agents overcome their inherent limitations and produce activated carbons with surface areas comparable to or exceeding those from strong acids and bases.
4Area of stationary object
If chemical activation methods are used to achieve high surface areas, then surface areas increase, but costs increase due to expensive activating agents
Solution Approach 1:
The patent replaces expensive strong acids and bases with inexpensive weak acidic salts, weak basic salts, and neutral salts. These cheaper alternative agents achieve the same high surface area activation function, significantly reducing the cost of activated carbon production while maintaining product quality.
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
This method achieves high surface areas of 1000-3500 m^2/g, reduces corrosion and costs, and enhances the recovery efficiency of activating agents, producing activated carbons suitable for various applications including ultracapacitors and water treatment.
Implementation Method 1
Chemical activation agents develop pores in activated carbons by severe chemical reactions between the chemical activation agent and the carbon precursor
Implementation Method 2
This invention is to disclose a method enabling a synergistic activation effect at high temperatures
Data Source
Figure 1a~1b
Figure 2
Figure 3a~3b
AI summary
Activated carbons with high surface areas are produced from a synergistic activation effect triggered at high temperatures by a predetermined combination of chemical activation agents derived from weak acidic salts, and/or weak basic salts, and/or neutral salts, and/or compounds. In one embodiment, a method of the present invention comprises mixing a carbon precursor with a first component comprising a first salt and at least one second component selected from the group consisting of a second salt, a compound and combinations thereof, in an inert environment or in carbon dioxide and/or steam environment.