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Synthesis of gamma-Bi2MoO6 catalyst studied by combined high-resolution powder diffraction, XANES and Raman spectroscopy

Kongmark, C; Martis, V; Pirovano, C; Lofberg, A; van Beek, W; Sankar, G; ... Bordes-Richard, E; + view all (2010) Synthesis of gamma-Bi2MoO6 catalyst studied by combined high-resolution powder diffraction, XANES and Raman spectroscopy. CATALYSIS TODAY , 157 (1-4) 257 - 262. 10.1016/j.cattod.2010.02.071.

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Abstract

The formation of crystalline gamma-Bi2MoO6 during hydrothermal synthesis was followed by a combination of HRPD XANES and Raman scattering in situ techniques The environment of Mo species changes from isolated tetrahedral MoO42- in the initial gel to distorted octahedra in gamma-Bi2MoO6 (Raman XANES) In the initial stages spherical (Bi Mo)(2)O-3 particles form with a fluorite structure and the growth of anisotropic platelets of gamma-Bi2MoO6 follows in a second step (HRPD) The presence of molybdenum specie in the intermediate (Bi Mo)(2)O-3 mixed oxide was ascertained by EDS during complementary ex situ experiments These particles are assumed to be involved in the crystal growth process their structure acting as a skeleton for the formation of gamma-Bi2MoO6 koechlinite (C) 2010 Elsevier B V All rights reserved

Type:Article
Title:Synthesis of gamma-Bi2MoO6 catalyst studied by combined high-resolution powder diffraction, XANES and Raman spectroscopy
Location:Lille, FRANCE
DOI:10.1016/j.cattod.2010.02.071
Keywords:In situ techniques, Combined XAS/Raman/XRD, Crystallization process, gamma Bi2MoO6 catalyst, BISMUTH MOLYBDATE CATALYSTS, RAY-ABSORPTION-SPECTROSCOPY, IN-SITU, SELECTIVE OXIDATION, OXIDE CATALYSTS, VANADYL PYROPHOSPHATE, NEUTRON-DIFFRACTION, TRANSFORMATIONS, CRYSTALS, KINETICS
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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