Activated Carbon Catalyst for Exhaust Gas CO2 and SO2 Removal
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Solution Overview
Problem
Current methods for removing carbon dioxide and sulfur dioxide from exhaust gases are either ineffective or energy-intensive, failing to efficiently convert CO2 into usable products and often shift the pollution problem rather than solving it.
Innovation Solution
A catalytic process using an activated carbon catalyst, where the catalyst is saturated with SO2, and exhaust gases are saturated with water, allowing for the simultaneous catalytic conversion of SO2 to H2SO4 and CO2 to C and/or carbon compounds, which are then washed out and utilized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to remove carbon dioxide from exhaust gases, then the problem of CO2 removal is addressed, but the methods are either ineffective or very energy-intensive
Solution Approach 1:
The invention converts the harmful CO2 emissions into useful carbon products (such as carbon black or other carbon-containing materials) through catalytic conversion. The exothermic oxidation of CO to CO2 provides the necessary heat energy for the endothermic CO2 conversion reaction, turning waste heat and waste gas into valuable resources. This eliminates the need for external energy input while achieving effective CO2 removal and product generation.
Solution Approach 2:
The process combines multiple functions into a single catalytic reactor: CO oxidation, CO2 conversion, and heat integration. The exothermic and endothermic reactions are coupled in the same reactor system, allowing heat transfer from the CO oxidation zone to the CO2 conversion zone. This merging of functions achieves CO2 removal without additional energy consumption while simultaneously producing carbon products.
2Productivity
If existing methods are used to bind carbon dioxide to solids or liquids for storage, then CO2 removal is achieved, but the problem is only shifted rather than solved
Solution Approach 1:
Instead of merely storing CO2 as a waste product, the invention converts it into valuable carbon-containing products that can be utilized in industry. The CO2 is transformed into useful materials rather than being sequestered, thereby eliminating the need for separate storage infrastructure and avoiding the displacement of pollution problems to other locations or media.
Solution Approach 2:
The process recovers carbon from CO2 in the form of usable carbon products (such as carbon black). Rather than discarding CO2 as waste that requires storage, the system recovers and utilizes the carbon content, converting a harmful emission into a valuable resource that can replace other carbon sources in industrial applications.
3Productivity
If electrochemical reduction of carbon dioxide is used, then CO2 can be converted, but the process requires significant energy input from solar or other sources
Solution Approach 1:
The invention uses the exothermic oxidation of CO to CO2 as an internal energy source to drive the endothermic CO2 conversion reaction. This eliminates the need for external solar or electrical energy input required by electrochemical methods. The system is self-sufficient, using the heat generated from one reaction to power another, thereby achieving CO2 conversion without significant external energy input.
Solution Approach 2:
The catalytic system is self-sufficient in terms of energy requirements. The exothermic CO oxidation reaction provides the necessary heat for the endothermic CO2 conversion, making the system self-powered. No external energy input from solar panels, electrical sources, or other stationary energy systems is required, as the reactions themselves provide and consume the necessary energy internally.
4Productivity
If activated carbon is used as catalyst for SO2 conversion to H2SO4, then sulfuric acid is produced, but CO2 is not converted into carbon and oxygen
Solution Approach 1:
The activated carbon catalyst performs multiple functions simultaneously: it catalyzes both the oxidation of SO2 to H2SO4 and the conversion of CO2 to carbon products. The catalyst is not limited to a single function but can facilitate different reaction pathways depending on the reactants present, making the system versatile in handling multiple exhaust gas components and producing multiple valuable products from a single reactor.
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 process effectively removes at least 40% of CO2 and 40-60% of SO2 from exhaust gases, converting them into usable products like sulfuric acid and carbon compounds, reducing the energy intensity and environmental impact compared to existing methods.
Implementation Method 1
catalytic conversion on the same catalyst of CO2 into C and O2
Implementation Method 2
catalytic conversion of the SO2 to H2SO4
Implementation Method 3
introduction of the finest water droplets into the flue gas, which results in a reduction in temperature and an increase in the water content
Implementation Method 4
Saturation of the activated carbon with SO2
Data Source
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AI summary
The present invention relates to a method for the catalytic removal of sulphur dioxide and carbon dioxide from exhaust gases in a reactor charged with an activated carbon catalyst, wherein the method comprises the following steps: ° saturation of the activated carbon with SO2, ° saturation or partial saturation of the exhaust gases with water, ° introduction of the exhaust gases into the reactor, ° catalytic conversion of the SO2 to H2SO4 and in parallel thereto, the catalytic conversion in the presence of the same catalyst of CO2 to C and O2 and also to sulphur-carbon compounds. ° Washing out the catalyst and discharging the H2SO4 as liquid and the C as solid and/or bound to sulphur compounds.