Open AccessMulti‐component fitting XAFS analysis of molybdate species during catalyst preparation by the molten salt method
Author(s) -
Matsubayashi Nobuyuki,
Sato Koichi,
Imamura Motoyasu,
Shimada Hiromichi,
Afanasiev Pavel,
Geantet Christophe
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500017507
Subject(s) - molybdate , molten salt , x ray absorption fine structure , catalysis , chemistry , salt (chemistry) , inorganic chemistry , extended x ray absorption fine structure , molybdenum , component (thermodynamics) , spectroscopy , absorption spectroscopy , organic chemistry , thermodynamics , physics , quantum mechanics
The goal of the present study was to elucidate the formation mechanisms of highly dispersed catalysts by the molten salt method. For this purpose, multi‐component fitting Mo K‐edge EXAFS analysis was applied to the structure of molybdate catalysts prepared in KNO 3 and NaNO 3 . The analysis revealed that MoO 3 dissolved in molten salts was at first transformed into polymolybdate anions and finally into MoO 4 2‐ anions. The transformation into MoO 4 2‐ anions took place at a lower temperature when NaNO3 was used as molten salt than KNO 3 . In contrast, polymolybdate anions were stable even at higher temperature when ZrO 2 was added as a support of molybdate.