Methanol oxidation on MoO3/TiO2 catalysts

Brückman, K.; Grzybowska, B.; Che, M.; Tatibouët, Jean‐Michel

doi:10.1016/0926-860x(90)80016-8

Cited by 33 publications

(14 citation statements)

References 22 publications

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“…A similar trend was observed earlier for propane oxidative dehydrogenation 33. A dependence of catalytic behaviour on the surface coverage was reported for methanol oxidation on MoO 3 /TiO 2 by Brückman et al34 They found that two different zones may be distinguished which correspond to a molybdena content higher and lower than a theoretical monolayer. In a submonolayer region, the total rate of methanol consumption depends largely on the specific surface area and on the surface coverage.…”

Section: Resultssupporting

confidence: 87%

Selective Autooxidation of Ethanol over Titania‐Supported Molybdenum Oxide Catalysts: Structure and Reactivity

et al. 2012

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We study the selective catalytic oxidation of ethanol with air as a sustainable alternative route to acetaldehyde. The reaction is catalysed by molybdenum oxide supported on titania, in a flow reactor under ambient pressure. High selectivity to acetaldehyde (70%–89%, depending on the Mo loading) is obtained at 150 °C. Subsequently, we investigate the structure/performance relationship for various molybdenum oxide species using a combination of techniques including diffuse reflectance UV-visible, infrared, X-ray photoelectron spectroscopies, X-ray diffraction and temperature programmed reduction. As their surface density increases, the monomeric molybdenum oxide species undergo two-dimensional and three-dimensional oligomerisation. This results in polymolybdates and molybdenum oxide crystallites. Importantly, the ethanol oxidation rate depends not only on the overall molybdenum loading and dispersion, but also on the type of molybdenum oxide species prevalent at each surface density and on the domain size. As the molybdenum oxide oligomerisation increases, electron delocalisation becomes easier. This lowers the absorption edge energy and increases the reaction rate.

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Section: Resultssupporting

confidence: 87%

Selective Autooxidation of Ethanol over Titania‐Supported Molybdenum Oxide Catalysts: Structure and Reactivity

et al. 2012

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“…Catalysts based on MoO 3 /TiO 2 are active in various reactions of industrial importance such as hydrodesulfurization [1][2][3], partial oxidation of methanol [4], vapour-phase ammoxidation of toluene [5], the watergas shift reaction [6], epoxidation of allylacetate with 3-butyl hydroperoxide [7], oxidation of 1-butene and butadiene [8] and selective catalytic reduction of NO x by NH 3 [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Preparation of MoO3/TiO2 Catalysts with Eggshell and Uniform Mo Distribution by Water-Assisted Spreading of MoO3

et al. 2006

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MoO 3 /TiO 2 catalysts were prepared by reaction of TiO 2 extrudates (140 m 2 g )1 ) with a MoO 3 /H 2 O slurry. The adsorption of molybdena species was strong; sharp, deep eggshell profiles of the Mo concentration were obtained. The hydrodesulfurization activity of saturated catalysts with a uniform Mo distribution (about 10 wt.% MoO 3 ) was at least the same as that of a sample prepared by conventional impregnation.

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“…Therefore, to make the regeneration and separation easier, the development of active solid cat alysts is highly desirable. Molybdenum oxide has found a wide application in the industrial processes such as dehydration, dehydrogenation, and isomeriza tion [22][23][24][25]. Earlier the reactivities of supported MoO 3 catalysts in the transesterification of dimethyl oxalate with phenol were described [18].…”

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confidence: 99%

The effect of catalyst preparation on the activity of MoO3-SiO2 catalyst in transesterification of diethyl oxalate

Bian

Wang

2014

Kinet Catal

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Transesterification of diethyl oxalate (DEO) with phenol over MoO 3 -SiO 2 catalysts prepared by the sol−gel technique (MoO 3 -SiO 2 (SG)) and the impregnation method (MoO 3 -SiO 2 (I)) was conducted to produce diphenyl oxalate (DPO), which can be used as a precursor for manufacturing diphenyl carbonate (DPC). The sample MoO 3 -SiO 2 (SG) containing 12 wt % of MoO 3 showed the best performance with 71.0% conversion of DEO and 32.0% selectivity to DPO. Compared to MoO 3 -SiO 2 (I), improvements in the DEO conversion and DPO selectivity with MoO 3 -SiO 2 (SG) were 16.1 and 7%, respectively. Crystal structure and phase composition of MoO 3 -SiO 2 (I) and MoO 3 -SiO 2 (SG) catalysts with varying MoO 3 contents were investigated. The sample MoO 3 -SiO 2 (SG) with a similar chemical composition to MoO 3 -SiO 2 (I) has a larger specific surface area, indicating that the active component is well dispersed on the surface of the MoO 3 -SiO 2 (SG) catalysts. Results of XRD and XPS measurements suggest a high degree of dispersion of MoO 3 -SiO 2 (SG) catalysts that can account for an increase in DEO conversion and DPO selectivity. Coor dinately unsaturated MoO 3 species play a significant role in the catalytic performance of MoO 3 -SiO 2 (SG) catalysts in transesterification of DEO with phenol. In addition, IR measurements of pyridine adsorption and NH 3 -TPD data indicate that the amount of acid sites on the surface of MoO 3 -SiO 2 (SG) exceeds that found for the surface of MoO 3 -SiO 2 (I). An enhanced concentration of surface MoO 3 species in tetrahedral coor dination coupled with the presence of weak Lewis acid sites appear to be the main reason why MoO 3 -SiO 2 (SG) catalysts are superior to the MoO 3 -SiO 2 (I) system.

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Methanol oxidation on MoO3/TiO2 catalysts

Cited by 33 publications

References 22 publications

Selective Autooxidation of Ethanol over Titania‐Supported Molybdenum Oxide Catalysts: Structure and Reactivity

Selective Autooxidation of Ethanol over Titania‐Supported Molybdenum Oxide Catalysts: Structure and Reactivity

Preparation of MoO3/TiO2 Catalysts with Eggshell and Uniform Mo Distribution by Water-Assisted Spreading of MoO3

The effect of catalyst preparation on the activity of MoO3-SiO2 catalyst in transesterification of diethyl oxalate

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