研究目的
To investigate translucent packed bed structures as an alternative for scaling up microreactors in photocatalytic applications, focusing on improving productivity and energy efficiency.
研究成果
The designed translucent packed bed reactor demonstrated high performance with microreactor-like kinetics and improved energy efficiency. It achieved an apparent rate constant of 0.82 min?1 and a photocatalytic space-time yield of 0.657 m3 day?1 m?3 reactor kW?1, making it competitive with existing reactors. The use of ray tracing for light source design and the high specific surface area contributed to its success. Future work should focus on extending this approach to other applications and scaling up.
研究不足
The study is limited to specific reactor designs and materials (e.g., borosilicate spheres, TiO2 catalyst). The scalability and applicability to other photocatalytic reactions or industrial scales were not fully explored. Potential optimizations include improving LED efficiency and reducing energy losses in larger setups.
1：Experimental Design and Method Selection:
The study involved designing a photocatalytic reactor with a translucent packed bed structure and a custom LED light source. A ray tracing algorithm was used to model and optimize the light field for homogeneity. The reactor performance was evaluated using kinetic constants and performance parameters like space-time yield and photocatalytic space-time yield.
2：Sample Selection and Data Sources:
The reactor used borosilicate spheres coated with TiO2 P25 catalyst. Methylene blue trihydrate and H2O2 were used as the reaction solution for degradation tests. Data on irradiance and reactor performance were collected experimentally.
3：List of Experimental Equipment and Materials:
Equipment included a peristaltic pump (Ismatec VC MS/CA8), UV-VIS spectrophotometer (Avantes Avaspec 2048L), LED array, Ocean Optics QE65-pro spectrophotometer for irradiance measurements, ultrasonic bath (VWR ultrasonic cleaner), microwave digester (Berghoff), and ICP-OES (Perkin-Elmer). Materials included borosilicate beads (Sigma Aldrich), TiO2 P25 (Evonik), ethanol, methylene blue, H2O2, and glass for reactor construction.
4：Experimental Procedures and Operational Workflow:
The coating procedure involved preparing a TiO2 suspension, coating beads, drying, calcining, and washing. Photocatalytic experiments involved pumping the reaction solution through the reactor, activating the light source, and measuring degradation rates. Irradiance was characterized using ray tracing and experimental measurements.
5：Data Analysis Methods:
Data were analyzed using the Langmuir-Hinshelwood kinetics model for apparent rate constants. Space-time yield and photocatalytic space-time yield were calculated based on reactor volume, flow rate, and lamp power. Statistical analysis included standard deviations for reproducibility.
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Spectrophotometer
Avaspec 2048L
Avantes
To perform online absorbance measurements at 666 nm
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Spectrophotometer
QE65-pro
Ocean Optics
For irradiance measurements to validate the ray tracing model
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Peristaltic Pump
VC MS/CA8
Ismatec
To supply the reactor with reaction solution
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Ultrasonic Cleaner
VWR
To place the TiO2 suspension in an ultrasonic bath for homogenization
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Microwave Digester
Berghoff
To digest TiO2 samples for catalyst loading quantification
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ICP-OES
Perkin-Elmer
To measure digested solutions for catalyst loading analysis
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LED
Roithner Lasertechnik
Used in the LED array light source with emission wavelength of 375 nm
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Borosilicate Beads
Sigma Aldrich
Used as the base structure for the reactor, coated with TiO2 catalyst
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TiO2 P25
P25
Evonik
Photocatalyst material coated on the borosilicate beads
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