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Suppression of Deactivation Processes in Photocatalytic Reduction of CO 2 Using Pulsed Light
Author(s) -
Pschenitza Markus,
Meister Simon,
von Weber Alexander,
Kartouzian Aras,
Heiz Ueli,
Rieger Bernhard
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201600530
Subject(s) - photocatalysis , irradiation , rhenium , materials science , catalysis , photochemistry , pulse (music) , analytical chemistry (journal) , chemistry , optics , biochemistry , physics , chromatography , detector , nuclear physics , metallurgy
The one‐electron‐reduced (OER) species of rhenium‐based catalysts in the homogeneous photocatalytic reduction of CO 2 represents the starting point of light‐induced deactivation processes, which lead to low catalyst activity and productivity. Herein, we report the suppression of these processes using pulsed light. Experimental parameters to avoid the irradiation of the OER species were estimated, leading us to conclude that pulse lengths shorter than 1 ns and repetition rates lower than 33 Hz should be employed. [Re(bpy)(CO) 3 X] (bpy=2,2′‐bipyridine; X=Cl ( 1 ), Br ( 3 )) catalysts were employed in pulsed irradiation experiments using different light sources, pulse lengths and repetition rates. Pulsed irradiation experiments using LEDs revealed that a minimum average photon flux is necessary to enable CO 2 conversion. Furthermore, pulsed laser light with a 10 ns pulse length partially prevented lightinduced deactivation processes, whereas efficient suppression was achieved using a 30 ps pulse length.