Redetermination of the crystal structure of α-Bi2O3.3MoO3 by neutron diffraction and the catalytic oxidation of propene

Synthesis and Monitoring of α‐Bi2Mo3O12 Catalyst Formation using Thermo‐Raman Spectroscopy

“…[11] Bismuth molybdate catalyst systems have been structurally characterized, [12] and studied extensively by different the thermo-Raman spectroscopy. Additionally, the dehydration resulting in formation of anhydrous techniques such as X-ray absorption, [13] X-ray diffraction, [14] neutron diffraction, [15] time-of-flight SIMS, [16] electron diffraction techniques, [17] high-resolution electron microscopy and vibrational spectroscopy.…”

“…Matsuura et al [18] reported six bands around 900 and 800 cm Ϫ1 attributed to the stretching modes of each tetrahedral species. Theobald et al, [15] [30] ) based on the similarity of their Raman spectra. The crystal structure of Bi 2 Mo 3 O 12 ·4.75H 2 O has a monoclinic unit cell, with lattice parameters calculated to be a ϭ 6.334, b ϭ 11.593, c ϭ 5.777 Å and β ϭ 113.166°as indexed from the X-ray diffraction pattern.…”

Phase Composition and Charge Transport in Bismuth Molybdates

“…In both observed regions, the high- est electrical conductivity was found to be in the case of the γ-phase (sample 2/1) with the orthorhombic structure and the highest theoretical density, ρ theor = 8.26-8.28 g/cm 3 [13]. The lowest electrical conductivity was observed for the α-phase (sample 2/3) with the monoclinic structure and the lowest theoretical density, ρ theor = 6.19-6.26 g/cm 3 [19]. The theoretical density of the monoclinic β-phase (sample 1/1) was found to be ρ theor = 6.5 g/cm 3 [20].…”

Methods of synthesis of acrolein and its α-substituted derivatives

“…21 " 26 However, molybdenum catalysts are frequently used only for research purposes, for example, in the study of the dependence of the activity on the surface structure 27 or for the determination of the orientation of MoO 3 in the catalyst layers, which influences the selectivity of the reaction. 28 -29 Bimetallic catalysts, which contain, apart from molybdenum oxide, also bismuth, 30 cobalt, 31 or vanadium 32 oxide, are much more active. The incorporation of bismuth in an amount of even several tenths per cent increases the conversion of butene and the reaction selectivity with respect to methacrolein by tens per cent.…”