题目：Synergistic effects of UV-light and plasma in CO2 splitting over a TiO2 photocatalyst
时间：2026年8月3日 10:00-11:00
地点：美加墨世界杯官网 F310会议室
邀请人：刘宁 副教授（叶轮机械研究所）
Biography
Evgeny Rebrov got his PhD from Boreskov Institute of Catalysis (Novosibirsk) in 1999. In 2010 he was appointed full professor of Chemical Engineering at Queen’s University Belfast, then he moved to the University of Warwick (2014) and then joined TU Eindhoven (2019). His research at the Laboratory for Energy Intensified Chemical Reaction Engineering focuses on the development of structured multiphase reactors for flow chemistry applications to improve selectivity via precise control of temperature and residence time. Prof Rebrov is Editor of Chemical Engineering Journal and member of the editorial board of Frontiers in Chemical Engineering. He published more than 230 peer-reviewed papers, holds 9 patents and presented more than 60 invited talks.
Abstract
The combination of plasma with a photocatalyst emerged as a method to create plasma catalyst synergy. A photocatalyst is a semiconductors that accelerates the rate of chemical reactions upon exposure to light. Photocatalysis requires light activation to initiate a photoreaction on catalyst surface, where the conduction band and valence band could participate in oxidation or reduction of reactant species. In addition, UV light can modify the surface states of the titania catalyst to facilitate the activation of vibrationally excited CO2 molecules. Finally, light modifies the dielectric properties of a photocatalyst by increasing the dielectric constant, which may shift plasma pattern from filament-type to multiple surface-confined micro-discharges. Previous research into TiO2 photocatalysts in CO2 plasma DBD reactors showed that UV light intensity generated by CO2 discharge is weak and not sufficient to activate photocatalysts. In this study, we demonstrate that an external UV-light illumination can significantly enhance the CO2 decomposition rate.
The experiments were conducted in a plate-to-plate DBD reactor at an applied voltage in the range 6.0 to 8.5 kV. The high voltage (HV) electrode was made of titanium disc (diameter: 24.4 mm) and the ground electrode is made of brass (diameter: 19.5 mm). From the side the reactor is equipped with a quartz window for catalyst illumination. The UV light was produced by a set of UV LED at 365 nm with a total intensity of 3.6 W (electrical). The plasma characterization was performed from the voltage and current waveforms in the reactor. There is no photocatalytic activity in the absence of plasma.
The titania coating affects the microdischarge distribution, power consumption, and discharge regime of the reactor. It increases charge transfer across the gap, increases lifetime of microdischarges, and results in lower microdischarge density and therefore increased power consumption. The main observed effect upon irradiation is an increase in CO2 conversion, while the energy efficiency slightly decreases. The data suggests that a combination of plasma and UV-light induces a change in the nature of the micro-discharges and it may create specific surface vibrational states in the catalyst, which positively couple with the vibrationally excited CO2 species generated by the plasma.
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