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Impact of the Type of Reactor and the Catalytic Conditions on the Photocatalytic Production of Hydrogen Using a Fully Noble‐Metal‐Free System
Author(s) -
Reim Immanuel,
Wriedt Benjamin,
Tastan Ümit,
Ziegenbalg Dirk,
Karnahl Michael
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800289
Subject(s) - photocatalysis , noble metal , catalysis , hydrogen production , hydrogen , batch reactor , chemistry , metal , chemical engineering , continuous reactor , materials science , inorganic chemistry , photochemistry , organic chemistry , engineering
For efficient photocatalytic hydrogen production not only the photocatalytic system itself, but also the reactor design and appropriate catalytic conditions play a central role for achieving high overall activity and long lifetimes. To investigate these points further, a fully noble‐metal‐free system for the light‐driven reduction of protons to hydrogen, consisting of a copper photosensitizer and an iron carbonyl catalyst, was chosen as a model. The traditional batch reactor was replaced by a semi‐batch photoreactor with a continuously perfused gas phase in combination with in situ gas chromatography. This allowed for the time resolved analysis of all gases formed and enabled a systematic investigation of the impact of different light sources, light intensities and carrier gases. The results revealed a significant change in activity due to CO removal from the catalyst caused by the continuous gas flow. This effect can be counteracted by supplying additional CO through the gas phase.