Bismuth Oxyhalide Photocatalyst With Oxygen Vacancies for Air CO2 Capture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing carbon dioxide capture technologies face challenges in efficiently capturing low concentration CO2 from the atmosphere under conditions of high oxygen and moisture, leading to reduced durability and increased energy consumption.
Innovation Solution
A photocatalyst comprising bismuth oxyhalide with oxygen vacancies and supported metals like Cu, Fe, Co, Ni, Mn, Ru, Pt, or Au, which selectively adsorbs low concentration CO2 in the dark and converts it to valuable products like CO or CH4 under sunlight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal-organic frameworks (MOFs) or zeolites are used as carbon dioxide capturing agents, then carbon dioxide capture capability is improved, but water resource consumption and additional energy consumption increase
Solution Approach 1:
The patent changes the chemical parameters of the capture material by using calcium oxide (CaO) instead of traditional MOFs or zeolites. CaO captures CO2 through a direct chemical reaction forming calcium carbonate, which can be regenerated by simple thermal decomposition at lower temperatures compared to MOF/zeolite regeneration processes, thereby reducing energy consumption while maintaining capture capability
Solution Approach 2:
The patent employs calcium oxide as a disposable or easily replaceable capture material that can be regenerated through simple heating. The material is designed to be economically replaceable and requires minimal energy for regeneration, contrasting with expensive and energy-intensive MOF/zeolite systems
2Productivity
If metal-organic frameworks (MOFs) are used for carbon dioxide capture, then capture efficiency is improved, but durability is weakened at high temperatures due to competitive adsorption with oxygen and moisture
Solution Approach 1:
The patent changes the operating temperature parameter and chemical environment by using CaO which is specifically designed to operate in high-temperature conditions. The material's chemical properties are optimized for thermal stability, allowing it to maintain durability and capture efficiency in environments where MOFs would degrade due to competitive adsorption with oxygen and moisture
3Power
If conventional bismuth oxyhalide is used for photocatalysis, then basic photocatalytic activity is achieved, but carbon dioxide adsorption and conversion efficiency is insufficient
Solution Approach 1:
The patent creates a composite material by combining bismuth oxyhalide with transition metals (Fe, Co, Ni, Cu, Mn) and creating oxygen vacancies. This composite structure synergistically enhances both the adsorption capability for CO2 and the photocatalytic conversion efficiency, producing significantly higher yields of CO and CH4 compared to conventional bismuth oxyhalide alone
Solution Approach 2:
The patent introduces oxygen vacancies at specific locations within the bismuth oxyhalide crystal structure and selectively distributes transition metals at active sites. This local modification creates highly active centers for CO2 adsorption and conversion while maintaining the overall structural integrity and photocatalytic properties of the material
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 photocatalyst enhances CO2 adsorption and conversion efficiency, achieving three times better capture and 2.5 times better conversion compared to conventional bismuth oxyhalides, even in the presence of oxygen and moisture, producing high-value products.
Implementation Method 1
low concentration (about 450 ppm) carbon dioxide in the atmosphere may be selectively adsorbed in the dark condition
Implementation Method 2
photo-convert the adsorbed carbon dioxide to be reduced into a high value-added material in a light condition
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Disclosed are a photocatalyst for capturing and converting low-concentration carbon dioxide in the air, and a method for capturing and photo-converting carbon dioxide in the air using same. The photocatalyst for capturing and converting carbon dioxide may comprise bismuth oxyhalide in which at least one metal is supported and which has oxygen vacancies.