Ammoxidation of C 2 hydrocarbons over Mo–zeolite catalysts prepared by solid-state ion exchange: Nature of molybdenum species

Mannei, Emna; Ayari, Faouzi; Mhamdi, Mourad; Almohalla, M.; Guerrero-Ruı́z, A.; Delahay, Gérard; Ghorbel, Abdelhamid

doi:10.1016/j.micromeso.2015.07.036

Cited by 19 publications

(10 citation statements)

References 48 publications

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“…Interestingly, [Mo 2 O 7 ] 2species were detected only over MFI solids (Figs. S4A,B and DRS results in [19] ), while the formation of heptamers was inhibited over Z26(MoCl 3 ) ( Fig. 4SB).…”

Section: Mfi Mor and Bea Zeolites Exchanged With Moclmentioning

confidence: 82%

“…S4A-D). In particular, MOR support extended the formation of MoO 3 due to its particular structure [19] , while MFI and BEA issued solids loaded with small aggregates of MoO 3 (see XRD results in [19] ). Interestingly, [Mo 2 O 7 ] 2species were detected only over MFI solids (Figs.…”

Section: Mfi Mor and Bea Zeolites Exchanged With Moclmentioning

confidence: 90%

“…The solids No III-VI were characterized in our previous work [19] . However, using DRS, we revealed in this study that these solids stabilized MoO 3 and [MoO 4 ] 2species (Figs.…”

Section: Mfi Mor and Bea Zeolites Exchanged With Moclmentioning

confidence: 99%

“…Upon the SSIE, the small 8 MR side-pockets (2.6×5.7 Å) in mordenite [19] favoured the formation of amorphous MoO3 agglomerates [19] , while DRS results revealed the presence of [MoO 4 ] 2and [Mo 7 O 24 ] 6species. In ethane ammoxidation, MOR(MoCl 3 ) is the least active catalyst since amorphous MoO 3 catalyzes the secondary reaction and inhibits the accessibility of reactants toward internal active sites.…”

Section: Mocl3 Issued Catalystsmentioning

confidence: 99%

“…In ethane ammoxidation, MOR(MoCl 3 ) is the least active catalyst since amorphous MoO 3 catalyzes the secondary reaction and inhibits the accessibility of reactants toward internal active sites. However, in ethylene ammoxidation, this catalyst exhibited an interesting behaviour due to the presence of medium-strength acid sites [19] , which easily desorbed NH3 required in Eq.(3). In fact, strong acid-sites are inefficient in acid catalysis over mordenite [30] .…”

Section: Mocl3 Issued Catalystsmentioning

confidence: 99%

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Acetonitrile Synthesis via Ammoxidation: Mo/zeolites Catalysts Screening

Ayari

Mannei

Asedegbega–Nieto

et al. 2020

Fine Chemical Engineering

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Mo/zeolites catalysts were investigated in ethane and ethylene ammoxidation into acetonitrile. The catalysts were prepared either in solid‒solid or liquid‒solid interface after varying different parameters. The stabilization of Mo species upon the exchange is dependent on the hydrophilic/hydrophobic character of the zeolite and the type of Mo precursor. In fact, zeolites with low Si/Al molar ratios should be avoided due to their higher dehydration enthalpy values (Δdehyd.H). On the other hand, the use of MoOCl4, Mo(CO)6 and MoCl3 precursors and zeolites with high Si/Al ratios led to inefficient [Mo7O24]6‒ species and amorphous MoO3 which catalyzes the combustion reaction. Nevertheless, the use of MoCl5, MoO3 and MoO2(C5H7O2)2 led to promising activities. In catalysis, [MoO4]2‒ species are required to activate C2H6 into C2H4, while [MoxO3x+1]2‒ (x =1, 2) species catalyze the ammoniation of C2H4 and the ethylamine dehydrogenation into CH3CN. Interestingly, active catalysts could be obtained by humid impregnation and a simultaneous oxidative treatment. Such a treatment improves the dispersion state of crystalline MoO3, which activate ethane molecules. It is judicious to perform C2H6 oxidative dehydrogenation before ammoxidation since the interference between the different investigated parameters could be noted.

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Section: Mfi Mor and Bea Zeolites Exchanged With Moclmentioning

confidence: 82%

Section: Mfi Mor and Bea Zeolites Exchanged With Moclmentioning

confidence: 90%

“…The solids No III-VI were characterized in our previous work [19] . However, using DRS, we revealed in this study that these solids stabilized MoO 3 and [MoO 4 ] 2species (Figs.…”

Section: Mfi Mor and Bea Zeolites Exchanged With Moclmentioning

confidence: 99%

Section: Mocl3 Issued Catalystsmentioning

confidence: 99%

Section: Mocl3 Issued Catalystsmentioning

confidence: 99%

See 3 more Smart Citations

Acetonitrile Synthesis via Ammoxidation: Mo/zeolites Catalysts Screening

Ayari

Mannei

Asedegbega–Nieto

et al. 2020

Fine Chemical Engineering

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Efficient Epimerization of Glucose to Mannose over Molybdenum‐Based Catalyst in Aqueous Media

Liu

Zhang

et al. 2020

ChemistrySelect

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Herein, the high activity and selectivity of activated carbonsupported molybdenum oxide catalysts (Mo/AC) in the epimerization of glucose to mannose is described. The catalysts afforded near-equilibrium glucose conversion (29.2 %) and selectivity (94.5 %) toward mannose in the epimerization of glucose. The catalysts were characterized by X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. It was found that the Mo/AC catalysts were mainly composed of highly dispersed MoO 2 and MoO 3 species. Compared to the soluble MoO 3 catalyst, Mo/AC showed higher stability and better catalytic performances in the epimerization of glucose to mannose. Further, the deactivation of Mo/AC catalysts was attributed to the leaching of molybdenum oxides. Isotope labeling experiments revealed that the deuterium atom at the C-1 position of mannose is formed by glucose-D2 epimerization.

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Ionic Liquid-Derived MoC Nanocomposites with Ordered Mesoporosity as Efficient Pt-Free Electrocatalyst for Hydrogen Evolution and Oxygen Reduction

Zhang

Chen

et al. 2016

Catal Lett

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Ammoxidation of C 2 hydrocarbons over Mo–zeolite catalysts prepared by solid-state ion exchange: Nature of molybdenum species

Cited by 19 publications

References 48 publications

Acetonitrile Synthesis via Ammoxidation: Mo/zeolites Catalysts Screening

Acetonitrile Synthesis via Ammoxidation: Mo/zeolites Catalysts Screening

Efficient Epimerization of Glucose to Mannose over Molybdenum‐Based Catalyst in Aqueous Media

Ionic Liquid-Derived MoC Nanocomposites with Ordered Mesoporosity as Efficient Pt-Free Electrocatalyst for Hydrogen Evolution and Oxygen Reduction

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