研究目的
The study aims at the use of a photo-microfluidic chip reactor with packed-bed configuration using TiO2 (P25) as the active phase in order to reach the total photo-oxidation of propene (VOC), using a LED lamp to irradiate the photo-microreactor.
研究成果
The photo-microfluidic chip reactor illuminated with LED represents a highly efficient system to achieve total photocatalytic propene oxidation at low concentration, using a few milligrams of catalyst (TiO2, P25) inside the microreactor with excellent performance in terms catalytic activity compared to the same catalyst in a conventional reactor and in a microcapillary reactor.
研究不足
The main drawback of the packed-bed configuration is the immobilization of the catalyst inside the reactor. The in-situ synthesis of a catalytic filling is not straightforward, and it is very important to properly control the synthesis conditions to generate an adequate interparticle spacing to avoid high pressure drops in the system.
1：Experimental Design and Method Selection
The study involves the use of a photo-microreactor illuminated with a low power LED light for the total oxidation of propene using a TiO2 photocatalyst. The methodology includes the incorporation of TiO2 (P25) inside a commercial glass microchannel chip using a packed-bed configuration.
2：Sample Selection and Data Sources
The samples used include commercial titanium dioxide (P25, Evonik), absolute ethanol (EtOH, 99.8%, Fisher Scientific), Pluronic F-127 (F-127, Sigma-Aldrich), and deionized water. The propene-containing stream contained 100 ppmv of propene diluted in synthetic air.
3：List of Experimental Equipment and Materials
UV light transparent microfluidic chips (Borosilicate glass) with a length of channel of 250 mm and an internal volume of 9.5 μl (Micronit Microtechnologies, Product Code: 000756), a LED light (LED ENGIN, model: LZ4-04UV00) with a maximum radiation peak at 365 nm, and a DC regulated power supply from Promax (model: FAC-662B).
4：Experimental Procedures and Operational Workflow
The incorporation of P25 inside the microfluidic chip was carried out by introducing a dispersion of P25 in EtOH in the presence of a surfactant (F-127). The filled microreactor was sealed and left to set at room temperature for 4 h, then annealed at 60 °C for 24 h, and calcined at 350 °C for 6 h.
5：Data Analysis Methods
The photocatalytic performance was studied using two different experimental systems designed in the laboratory. The propene-containing stream was passed through the microreactor or conventional reactor with photocatalyst, and the outlet was injected in a GC chromatograph (Agilent 6890 N) equipped with a CTR-I column (Alltech) operating at 30 °C.
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