A NEW GAS PHASE PHOTOCATALYTIC REACTOR FOR CO2 CONVERSION: OPTIMAL PHOTOREDUCTION CONDITIONS WITH TIO2 P25 PHOTOCATALYST

1 HUO Pengwei
Co-authors:
1 RELI Martin 1 MATĚJOVÁ Lenka 1,2 ŠIHOR Marcel 1,2 OBALOVÁ Lucie 1,2,3 KOČÍ Kamila
Institutions:
1 Institute of Environmental Technology, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic, EU
2 Faculty of Metallurgy and Materials Engineering, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic, EU
3 Energy Units for Utilization of non Traditional Energy Sources, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic, EU
Conference:
7th International Conference on Nanomaterials - Research & Application, Hotel Voronez I, Brno, Czech Republic, EU, October 14th - 16th 2015
Proceedings:
Proceedings 7th International Conference on Nanomaterials - Research & Application
Pages:
236-241
ISBN:
978-80-87294-59-8
ISSN:
2694-930X
Published:
11th January 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
14 views / 2 downloads
Abstract

In this work, a new gas phase photocatalytic reduction system was designed to convert CO2 into fuels. The optimal conditions (such as humidity, initial concentration of CO2 and the placement of powder photocatalyst in the reactor) for CO2 photocatalytic reduction were systematically investigated with the commercial photocatalyst TiO2 Evonik P25 in the homemade gas phase reactor. Methane (CH4) and hydrogen (H2) were the main products. Also carbon monoxide (CO) was detected. The photocatalytic reduction rate was decreasing with increasing dilution of CO2 by Helium. The humidity is the key role for the CO2 photocatalytic reduction as the source of needed H+ and hydroxyl radicals, the best value of relative humidity was experimentally set to 51.8% leading to the highest yields of all products (CH4, H2 and CO). In addition, the photocatalytic conversion was also influenced by the different placement of photocatalyst, the perfectly spread sample which possessed more effective gas-solid contact showed higher conversion than that of piled one.

Keywords: CO2 reduction, Photocatalysis, TiO2
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