Influence of the composition and preparation method of molybdenum systems on their oxidizing properties in ethane conversion

Redox conversion of ethane at 600 °C on Mo-containing oxide systems differing in the composition and preparation method was studied. The ethane conversion and the selectivity of the ethylene formation increase in the series of MoO 3 samples supported on SiO 2 (silica gel), TiO 2 (anatase), and alumi...

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Bibliographic Details
Published in:Russian chemical bulletin 2022-08, Vol.71 (8), p.1641-1647
Main Authors: Usachev, N. Ya, Kalinin, V. P., Kazakov, A. V., Kanaev, S. A., Stakheev, A. Yu
Format: Article
Language:English
Subjects:
Additives
Aluminum oxide
Ammonium molybdate
Anatase
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Composition
Conversion
Ethane
Ethylene
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Gallium oxides
Inorganic Chemistry
Molybdenum trioxide
Organic Chemistry
Oxidation
Oxygen
Regeneration
Selectivity
Silica gel
Silicon dioxide
Titanium dioxide
Transitional aluminas
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Summary:Redox conversion of ethane at 600 °C on Mo-containing oxide systems differing in the composition and preparation method was studied. The ethane conversion and the selectivity of the ethylene formation increase in the series of MoO 3 samples supported on SiO 2 (silica gel), TiO 2 (anatase), and alumina. The efficiency of the MoO 3 /Al 2 O 3 systems increased when HNO 3 was added to a (NH 4 ) 6 Mo 7 O 24 solution used to impregnate the support, and also when γ-Al 2 O 3 was replaced with Al(OH) 3 . Gallium oxide additives improve the properties of the MoO 3 /Al 2 O 3 system, increasing the ethane conversion to 44% at ethylene formation selectivity of more than 96%. The systems under consideration are characterized by high stability and retain their activity after five reaction—regeneration cycles. Based on the data obtained during the reaction of ethane with the Mo systems and in the course of regeneration of the reduced samples with oxygen, the content of active oxygen corresponding to the MoO 3 ↔ MoO 2 transformation was assessed.
ISSN:1066-5285
1573-9171
DOI:10.1007/s11172-022-3573-4