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Conjugation effects in ethane oxidation under the conditions of oxidative coupling of methane

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Abstract

Ethane conversion under the conditions of oxidative coupling of methane (OCM) has been investigated. In an empty reactor above 800°C, ethane oxidation occurs at a higher rate, and its main product is carbon monoxide. In the presence of NaWMn/SiO2 catalyst the rate of ethane oxidation noticeably decreases, and ethylene becomes the main product of the reaction. Thus, it is demonstrated that the catalyst, on one hand, is an effective inhibitor of unselective gas phase oxidation processes, and on the other hand, it substantially changes the hydrocarbon conversion routes. The complex kinetic conjugation during ethane oxidation in the presence of an excess of methane in the reaction mixture is observed. In the case of homogeneous ethane oxidation, methane acts as the gas-phase oxidation inhibitor, presumably by reducing chain reactions contribution to the overall reaction rate. On the contrary, during the oxidation of a methane-ethane mixture over NaWMn/SiO2 catalyst, a strong mutual effect of the hydrocarbon components on the rate and direction of their transformation is observed.

About the Authors

V. I. Lomonosov
N.N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 119991
Russian Federation


T. R. Usmanov
M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571
Russian Federation


M. Yu. Sinev
M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571
Russian Federation


S. N. Antonyuk
M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571
Russian Federation


References

1. Крылов О.В., Арутюнов В.С. // Окислительные превращения метана. М.: Наука, 1998. 350c.

2. Sinev M.Yu., Fattakhova Z.T., Lomonosov V.I., Gordienko Yu. A. Kinetics of oxidative coupling of methane: Bridging the gap between comprehension and description // J. Nat. Gas Chem. 2009. V. 18(3). Is. 3. P. 273-287.

3. Shi C., Rosynek M.P., Lunsford J.H. Origin of Carbon Oxides during the Oxidative Coupling of Methane // J. Phys. Chem. 1994. V. 98. P. 8371-8376.

4. Nelson P.F., Cant N.W. Oxidation of C2 hydrocarbon products during the oxidative coupling of methane over a lithium/magnesia catalyst // J. Phys. Chem. 1990. V. 94. P. 3756-3761.

5. Ekstrom A., Lapszewicz J.A., Campbell I. Origin of the low limits in the higher hydrocarbon yields in the oxidative coupling reaction of methane // Appl. Catal. 1989. V. 56(1). L29-L34.

6. Ломоносов В.И., Усманов Т.Р., Синев М.Ю., Бычков В.Ю. Закономерности окисления этилена в условиях реакции окислительной конденсации метана // Кинетика и катализ. 2014 Т. 55. № 4. С. 498-505.

7. Morales E., Lunsford J.H. Oxidative dehydrogenation of ethane over a lithium-promoted magnesium oxide catalyst // J. Catal. 1989. V. 118. P. 255-265.

8. Conway S.J., Lunsford J.H. The oxidative dehydrogenation of ethane over chlorine-promoted lithium-magnesium oxide catalysts // J. Catal. 1991. V. 131(2) P. 513-522.

9. Consay S.J., Wang D.J., Lunsford J.H. Selective oxidation of methane and ethane over Li+-MgO-Cl- catalysts promoted with metal oxides // Appl. Catal. A. 1991. V. 79(1). P. L1-L5.

10. Mackie J.C., Smith J.G., Nelson P.F., Tyler R.J. Inhibition of C2 oxidation by methane under oxidative coupling conditions // Energy Fuels. 1990. V. 4(3). Р. 277-285.

11. Магомедов Р.Н., Прошина А.Ю., Пешнев Б.В., Арутюнов В.С. Влияние газовой среды и гетерогенных факторов на газофазный окислительный крекинг этана // Кинетика и катализ. 2013. Т. 54. № 4. C. 413-419.

12. Синев М.Ю., Корчак В.Н., Крылов О.В. Кинетика окислительной конденсации метана в присутствии катализатора 40% РЬO/Аl2O3. 1. Кинетика окисления метана // Кинетика и катализ. 1989. T. 30. № 4. C. 855-859.

13. Синев М.Ю., Корчак В.Н., Крылов О.В. Кинетика окислительной конденсации метана в присутствии катализатора 40% РЬO/Аl2O3. 2. Кинетика окисления этана и этилена // Кинетика и катализ. 1989. T. 30. № 4. C. 860-864.

14. Ломоносов В.И., Гордиенко Ю.А., Синев М.Ю. Кинетические закономерности окислительной конденсации метана в присутствии модельных катализаторов // Кинетика и катализ. 2013. Т. 54. № 4. С.474-486.

15. Zhang Y.D., Li S.B., Liu Y., Lin J.Z., Lu G.G., Yang X.Z., Zhang J. Cofeeding of methane and ethane over Na2WO4-Mn/SiO2 catalyst to produce ethylene // Stud. Surf. Sci. Catal. 1998. V. 119. P. 599-604.

16. Labinger, J.A., Ott, K.C., Mechanistic studies on the oxidative coupling of methane // J. Phys. Chem. 1987. V. 91(11). P. 2682-2684.


For citation:


Lomonosov V.I., Usmanov T.R., Sinev M.Yu., Antonyuk S.N. Conjugation effects in ethane oxidation under the conditions of oxidative coupling of methane. Fine Chemical Technologies. 2014;9(6):55-61. (In Russ.)

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)