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Photocatalytic Deacon Reaction over SrTiO 3
Author(s) -
Rath Tobias,
Deitermann Michel,
Zhao Guixia,
Wilma Busser G.,
Jansen Henning,
Schwiderowski Philipp,
Xia Wei,
Muhler Martin
Publication year - 2021
Publication title -
chemphotochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.13
H-Index - 18
ISSN - 2367-0932
DOI - 10.1002/cptc.202000314
Subject(s) - photocatalysis , x ray photoelectron spectroscopy , calcination , catalysis , scanning electron microscope , analytical chemistry (journal) , chemistry , materials science , chemical engineering , organic chemistry , engineering , composite material
SrTiO 3 was prepared by a polymeric precursor method and applied in the photocatalytic aerobic oxidation of HCl in a flat‐plate reactor equipped with a UV LED array (368 nm). Reaction rates up to 240 mmol h −1 m −2 and apparent quantum yields up to 33 % using an illuminated area of 60 cm −2 were achieved with highly crystalline SrTiO 3 calcined at 750 °C, outperforming commercially available SrTiO 3 by a factor of almost 2. A gradual catalyst deactivation was observed, which was due to the formation of crystalline SrCl 2 ×2 H 2 O on the surface confirmed by X‐ray diffraction, electron microscopy and X‐ray photoelectron spectroscopy (XPS). Increasing the HCl partial pressure accelerated both Cl 2 formation and catalyst deactivation. XP spectra revealed an intrinsic surface segregation of Sr and the presence of several Sr‐ or O‐containing surface species. High Cl 2 yields up to 42 % obtained with an illuminated area of 120 cm −2 encourage further research on a photocatalytic Deacon process for improved HCl recycling.