2026-05-28T13:18:49Zhttps://riuma.uma.es/rest/oai/requestoai:riuma.uma.es:10630/240702026-02-03T10:55:27Zcom_10630_2254col_10630_37953
RIUMA. Repositorio Institucional de la Universidad de Málaga
author
Iglesias-Juez, Ana
author
Chiarello, Gian Luca
author
Patience, Gregory
author
Guerrero-Pérez, María Olga
2022-05-09T12:11:51Z
2022-05-09T12:11:51Z
2021-08-21
A. Iglesias-Juez, G.L. Chiarello, G. S. Patience, M. O. Guerrero-Pérez,Can. J. Chem. Eng.2022,100(1), 3.https://doi.org/10.1002/cjce.2429122
https://hdl.handle.net/10630/24070
10.1002/cjce.24291
Although X-ray absorption spectroscopy (XAS) was conceived in the early 20th century, it took 60 years after the advent of synchrotrons for researchers to exploit its tremendous potential. Counterintuitively, researchers are now developing bench type polychromatic X-ray sources that are less brilliant to measure catalyst stability and work with toxic substances. XAS measures the absorption spectra of electrons that X-rays eject from the tightly bound core electrons to the continuum. The spectrum from 10 to 150 eV (kinetic energy of the photoelectrons) above the chemical potential—binding energy of core electrons—identifies oxidation state and band occupancy (X-ray absorption near edge structure, XANES), while higher energies in the spectrum relate to local atomic structure like coordination number and distance, Debye-Waller factor, and inner potential correction (extended X-ray absorption fine structure, EXAFS). Combining XAS with complementary spectroscopic techniques like Raman, Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) elucidates the nature of the chemical bonds at the catalyst surface to better understand reaction mechanisms and intermediates. Because synchrotrons continue to be the light source of choice for most researchers, the number of articles Web of Science indexes per year has grown from 1000 in 1991 to 1700 in 2020. Material scientists and physical chemists publish an order of magnitude articles more than chemical engineers. Based on a bibliometric analysis, the research comprises five clusters centred around: electronic and optical properties, oxidation and hydrogenation catalysis, complementary analytical techniques like FTIR, nanoparticles and electrocatalysis, and iron, metals, and complexes.
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Espectroscopía de rayos X
Experimental methods in chemical engineering: X-rayabsorption spectroscopy—XAS, XANES, EXAFS
journal article
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Can J Chem Eng - 2021 - Iglesias‐Juez - Experimental methods in chemical engineering X‐ray absorption spectroscopy XAS .pdf