Premium
Determination of the copper oxidation state in a zeolite catalyst through the X‐ray absorption edge/self‐absorption effect by electron probe microanalysis
Author(s) -
Wang Frank ChengYu
Publication year - 1994
Publication title -
x‐ray spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.447
H-Index - 45
eISSN - 1097-4539
pISSN - 0049-8246
DOI - 10.1002/xrs.1300230608
Subject(s) - copper , microanalysis , zeolite , absorption (acoustics) , catalysis , absorption edge , analytical chemistry (journal) , inorganic chemistry , extended x ray absorption fine structure , oxidation state , materials science , chemistry , absorption spectroscopy , metallurgy , optics , composite material , organic chemistry , optoelectronics , band gap , physics
Owing to improvements in impregnation techniques, the impregnation of copper compounds into a zeolite framework to form copper zeolite catalysts results in more uniformly distributed and finer (nanoscale size) copper‐containing particles. In order to determine the oxidation state of copper in a copper zeolite catalyst, a method utilizing the X‐ray absorption‐induced (absorption edge/self‐absorption) effect was developed using electron probe microanalysis. This method can provide oxidation state information that is not possible with traditional quantitative microanalysis owing to the electron beam and specimen interaction volume. The advantages and limitations of this method are discussed.