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Rapid‐Scan Operando Infrared Spectroscopy
Author(s) -
DavóQuiñonero Arantxa,
BuenoLópez Agustín,
LozanoCastelló Dolores,
McCue Alan J.,
Anderson James A.
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.201600302
Subject(s) - nox , absorbance , catalysis , chemistry , infrared spectroscopy , spectroscopy , photochemistry , infrared , diesel fuel , reaction mechanism , organic chemistry , combustion , chromatography , quantum mechanics , optics , physics
Novel methodology, referred to as rapid‐scan operando, has been demonstrated to be a highly powerful tool for studying reaction mechanisms in heterogeneous catalysis, because it combines rapid scan for IR monitoring in the milliseconds time frame and operando methodology. As proof of concept, the NO x –CO and NO x –H 2 reactions were studied as model catalyzed reactions with practical interest for removal of NO x in diesel exhausts. Rapid‐scan operando experiments confirmed state‐of‐the‐art knowledge concerning the reaction mechanisms and, more importantly, allowed us to elucidate, for the first time, the different roles of the surface hydroxy groups depending on the reductant used (CO or H 2 ). Moreover, this new tool was used to distinguish the behavior of carbonates and nitrites under reaction conditions that could not be monitored by conventional IR spectroscopy approaches owing to overlap of their absorbance bands.