Photocatalytic hydrogen generation during water splitting over a commercial TiO2 photocatalyst P25: modelling and experimental studies.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F22%3A10251132" target="_blank" >RIV/61989100:27710/22:10251132 - isvavai.cz</a>

Výsledek na webu

<a href="https://sscheconference.sk/" target="_blank" >https://sscheconference.sk/</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Photocatalytic hydrogen generation during water splitting over a commercial TiO2 photocatalyst P25: modelling and experimental studies.

Popis výsledku v původním jazyce

Poster na konferenci International Conference of SSCHE and PERMEA, 23.-26.5.2022, Tatranské Matliare, SlovakiaIncreasing energy consumption, depletion of fossil fuels, and environmental pollution caused by human activities represent major issues. Hydrogen appears to be a promising candidate for replacing fossil fuels without adversely affecting fuel process efficiency and the environment. Photocatalytic water splitting is based on harvesting light energy exploited for yielding hydrogen. In this work, was created a phenomenological kinetic model of hydrogen generation that considers a limiting rate of H2 mass transfer from the liquid to the gas phase. The model works with a spatial distribution of irradiation in the photoreactor, which intrinsically affects the reaction term in the H2 mass balance. The effect of different concentrations of commercial TiO2 photocatalyst (Evonik P25) was investigated. Reaching the maximum yield of H2 generation requires loading the optimal concentration of a photocatalyst with a sufficiently large active surface and providing uniformly distributed intensive irradiation. The comparison of experimental and theoretical efficiencies showed a reasonable agreement that the theoretical average reaction rate reached a maximum for a photocatalyst concentration of 0.23 g/l, very close to the one observed experimentally 0.25 g/l. Interestingly, the photonic efficiency remains constant beyond this optimal catalyst concentration. The results of this investigation deepen the understanding of mass transfer limitations in the photocatalytic productionof gases and their effect on the overall performance of photoreactors.

Název v anglickém jazyce

Photocatalytic hydrogen generation during water splitting over a commercial TiO2 photocatalyst P25: modelling and experimental studies.

Popis výsledku anglicky

Poster na konferenci International Conference of SSCHE and PERMEA, 23.-26.5.2022, Tatranské Matliare, SlovakiaIncreasing energy consumption, depletion of fossil fuels, and environmental pollution caused by human activities represent major issues. Hydrogen appears to be a promising candidate for replacing fossil fuels without adversely affecting fuel process efficiency and the environment. Photocatalytic water splitting is based on harvesting light energy exploited for yielding hydrogen. In this work, was created a phenomenological kinetic model of hydrogen generation that considers a limiting rate of H2 mass transfer from the liquid to the gas phase. The model works with a spatial distribution of irradiation in the photoreactor, which intrinsically affects the reaction term in the H2 mass balance. The effect of different concentrations of commercial TiO2 photocatalyst (Evonik P25) was investigated. Reaching the maximum yield of H2 generation requires loading the optimal concentration of a photocatalyst with a sufficiently large active surface and providing uniformly distributed intensive irradiation. The comparison of experimental and theoretical efficiencies showed a reasonable agreement that the theoretical average reaction rate reached a maximum for a photocatalyst concentration of 0.23 g/l, very close to the one observed experimentally 0.25 g/l. Interestingly, the photonic efficiency remains constant beyond this optimal catalyst concentration. The results of this investigation deepen the understanding of mass transfer limitations in the photocatalytic productionof gases and their effect on the overall performance of photoreactors.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/EF16_019%2F0000853" target="_blank" >EF16_019/0000853: Institut environmentálních technologií - excelentní výzkum</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů