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Visible‐Light‐Assisted Selective Catalytic Reduction of Nitric Oxide with Ammonia over Dye‐Modified Titania Photocatalysts
Author(s) -
Yamamoto Akira,
Teramura Kentaro,
Hosokawa Saburo,
Shishido Tetsuya,
Tanaka Tsunehiro
Publication year - 2015
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.201500207
Subject(s) - photocatalysis , visible spectrum , catalysis , photochemistry , chemistry , diffuse reflectance infrared fourier transform , selectivity , nitrite , adsorption , irradiation , selective catalytic reduction , ammonia , reactivity (psychology) , inorganic chemistry , diffuse reflection , nuclear chemistry , nitrate , materials science , organic chemistry , medicine , physics , alternative medicine , optoelectronics , optics , pathology , nuclear physics
Dye‐modified TiO 2 photocatalysts showed a high photocatalytic activity for the selective catalytic reduction of NO with NH 3 in the presence of O 2 under visible‐light irradiation. Among the 15 dyes investigated, the maximum conversion was achieved using a Ru(2,2′‐bipyridyl‐4,4′‐dicarboxylic acid) 2 (NCS) 2 complex (N3‐dye) for the modification of TiO 2 (NO conversion >99 %, N 2 selectivity >99 %). Diffuse reflectance infrared Fourier transform spectroscopy showed that nitrite (NO 2 − ) and nitrate (NO 3 − ) species were generated on the N3‐TiO 2 surface under visible‐light irradiation. In gas‐switching reactions, NO 2 − on the N3‐TiO 2 surface became N 2 by a reaction with adsorbed NH 3 under visible‐light irradiation, although NO 3 − reacted with NH 3 to form N 2 and N 2 O. Based on the reactivity with NH 3 , we concluded that the NO 2 − species is an intermediate in the selective photocatalytic reduction and reacts with NH 3 adsorbed on the surface of N3‐TiO 2 under visible‐light irradiation to form N 2 selectively.