Determination of photocatalytic properties of supported catalysts with low-cost NOx sensors and the Arduino platform

Abstract

Carrier-bound titanium dioxide catalysts were used for the photocatalytic conversion of nitrogen dioxide. In this context, inexpensive metal oxide sensors were tested for their usefulness in the investigation and characterization of the photocatalysts. UV-A light emitting diodes of wavelength 365 nm stimulated the catalysts. By dimming the light emitting diodes, the influence of the energy flux density on the conversion kinetics could be investigated. The observed conversation followed first-order kinetics. The light intensity has shown a large influence at lower irradiances. At high irradiances an increase in recombination effects can be assumed, which makes irradiances greater than 40 W/m2 inefficient. From that point on no significant increase in the rate of conversation could be measured. The photon efficiency at low irradiances was determined to be 4.55% decreasing to 0.59% at higher irradiances. The flow rate of gas passing through the catalysts appears to have a linear effect on the overall rate of conversion. This is evidenced by a constant half-life within the reactor in relation to variable flow rate. The sensors have been shown to be calibratable and sufficiently stable, which raises the possibility of using the sensors for spatially resolved measurements within reaction systems. mehr

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Titel	Determination of photocatalytic properties of supported catalysts with low-cost NOx sensors and the Arduino platform
Medien	Journal of Photochemistry and Photobiology A Chemistry
Band	424
Verfasser	Prof. Dr. Tobias Schnabel, Simon Mehling, Manuel Dutschke, Christian Springer
Veröffentlichungsdatum	01.02.2022
Zitation	Schnabel, Tobias; Mehling, Simon; Dutschke, Manuel; Springer, Christian (2022): Determination of photocatalytic properties of supported catalysts with low-cost NOx sensors and the Arduino platform . Journal of Photochemistry and Photobiology A Chemistry 424. DOI: 10.1016/j.jphotochem.2021.113611