RT Journal Article
T1 Experimental methods in chemical engineering: X-rayabsorption spectroscopy—XAS, XANES, EXAFS
A1 Iglesias-Juez, Ana
A1 Chiarello, Gian Luca
A1 Patience, Gregory
A1 Guerrero-Pérez, María Olga
K1 Espectroscopía de rayos X
AB 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.
PB Wiley
YR 2021
FD 2021-08-21
LK https://hdl.handle.net/10630/24070
UL https://hdl.handle.net/10630/24070
LA eng
NO 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
NO The authors acknowledge travel support from the Eras-mus+KA107 (2018-1-ES01-KA107-049563) and funding for the open access charge from the Universidad deMÁlaga/CBUA. This work was undertaken, in part,thanks to funding from the Canada Research Chairs pro-gram (950-231476).
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026