Catalytic behaviour of molybdenum-based zeolitic materials prepared by organic-medium impregnation and sublimation methods

Mannei, Emna; Ayari, Faouzi; Asedegbega–Nieto, Esther; Mhamdi, Mourad; Delahay, Gérard

doi:10.1007/s13738-019-01837-6

Cited by 2 publications

(9 citation statements)

References 45 publications

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“…This category of solids was almost characterized in our earlier works [3][4][5]18] . However, we represent in Table 3 the data relative to the solids No VII-XI and III for comparison purpose.…”

Section: + -Zsm-5 (26) Exchanged With Moocl 4 Mocl 5 Mo(co) 6 Mmentioning

confidence: 98%

“…Our group [3,4,5] has reported Mo/zeolites as efficient catalysts for ethane ammoxidation (Eq. 1) into acetonitrile (AN).…”

Section: Will the World Have Enough Ethane?mentioning

confidence: 99%

“…(2), (3) and (4) [6] . The manufacture of acetonitrile via ammoxidation has attracted the attention of scientists till date [5,7] . In fact, AN is particularly used as electrolyte in dye-sensitized solar cells [8] (dipole moment ~3.44 Debye [9] ).…”

Section: Will the World Have Enough Ethane?mentioning

confidence: 99%

“…The nature of Mo species stabilized over Mo-OFF solid was estimated by the band gap energy values determined by DRS. The spectrum representing [F(R∞)×hν] 0.5 vs. hν [4,5] is illustrated in Fig. 2.…”

Section: Characterization Of Mo Containing Solids 321 Off and Fer Imentioning

confidence: 99%

“…The deconvolution of Mo-OFF spectrum revealed three O 2-→Mo 6+ charge transfer bands assigned to MoO 3 (E g = 3.00 eV), [Mo 7 O2 4 ] 6-(E g = 3.85 eV) and [MoO 4 ] 2-(Eg = 5.30 eV) [4,5] . In this spectrum, we were not able to detect the presence of [Mo 2 O 7 ] 2species characterized by a band between 3.85 and 5.3 eV.…”

Section: Characterization Of Mo Containing Solids 321 Off and Fer Imentioning

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: + -Zsm-5 (26) Exchanged With Moocl 4 Mocl 5 Mo(co) 6 Mmentioning

confidence: 98%

“…Our group [3,4,5] has reported Mo/zeolites as efficient catalysts for ethane ammoxidation (Eq. 1) into acetonitrile (AN).…”

Section: Will the World Have Enough Ethane?mentioning

confidence: 99%