TEDA-Impregnated Carbon Sorbent for NOx Removal
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Solution Overview
Problem
Existing adsorbents are costly and ineffective in removing nitrogen oxides, particularly nitrogen dioxide, from air and exhaust gases, necessitating the development of more efficient sorbent materials for respiratory and air purification applications.
Innovation Solution
The use of sorbent materials impregnated with triethylenediamine (TEDA) and additional additives such as copper, molybdenum, silver, and sulfates on activated carbon to enhance the adsorption of nitrogen-containing gases, including nitrogen dioxide, by varying the weight percentages of these components within specific ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional activated carbon is used to remove nitrogen oxides, then the structure is simple and cost is low, but the adsorption effectiveness is poor and breakthrough time is short
Solution Approach 1:
The patent employs composite sorbent materials combining activated carbon with multiple impregnants including TEDA (triethylenediamine), copper salts, molybdenum salts, silver salts, and sulfates. This composite approach creates synergistic effects where TEDA provides initial NO2 adsorption capability, metal salts enhance chemical reactivity and catalyst formation, and sulfates improve overall sorbent performance, collectively achieving superior adsorption effectiveness compared to conventional activated carbon alone
Solution Approach 2:
The patent systematically varies the weight percentages of different impregnants to optimize performance. Specific formulations include TEDA at 5-20 wt%, copper salts at 1-10 wt%, molybdenum salts at 0.1-5 wt%, silver salts at 0.1-5 wt%, and sulfates at 1-10 wt%. This parameter optimization allows tuning of the sorbent's chemical reactivity, adsorption capacity, and breakthrough time to achieve maximum NO2 removal effectiveness
2Reliability
If existing adsorbents are used, then the system is simple, but the cost is high and effectiveness is low
Solution Approach 1:
The patent employs preliminary impregnation of activated carbon with multiple chemical components during the manufacturing process. TEDA, copper salts, molybdenum salts, silver salts, and sulfates are pre-loaded onto the activated carbon matrix before deployment. This preliminary action ensures that the sorbent is pre-configured with the necessary chemical functionality to immediately begin NO2 adsorption and catalysis upon exposure, eliminating the need for post-installation activation or treatment
Solution Approach 2:
The patent uses TEDA as a key intermediary substance that mediates between the activated carbon matrix and nitrogen dioxide molecules. TEDA forms a complex with NO2 that enhances adsorption capacity and facilitates subsequent chemical reactions with metal salts. This intermediary role of TEDA bridges the physical adsorption capability of activated carbon with the chemical reactivity of metal impregnants, creating a multi-stage removal mechanism that improves overall effectiveness
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 described sorbents demonstrate improved breakthrough times for nitrogen dioxide and other toxic gases, showcasing enhanced adsorption capabilities compared to previous technologies, with specific examples showing increased effectiveness with varying TEDA content and combinations with other sorbents.
Implementation Method 1
Chemical adsorption reactions with impregnants on the activated carbon render noxious gasses as inert or convert them to a form that is more readily removed by the carbon
Data Source
AI summary
Adsorbents including a sorbent, at least one metal additive and greater than about 5 wt. % triethylenediamine are described herein. Methods for making such adsorbents and filters comprising the adsorbents are also described.