Deactivation of a mixed oxide catalyst of Mo–V–Te–Nb–O composition in the reaction of oxidative ethane dehydrogenation


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Abstract

The operational stability of a mixed oxide catalyst of Mo–V–Te–Nb–O composition in the oxidative dehydrogenation of ethane (ratio of C2H6: O2 = 3: 1) is studied in a flow reactor at temperatures of 340–400°C, a pressure of 1 atm, and a WHSV of the feed mixture of 800 h−1. It is found that the selectivity toward ethylene is 98% at 340°C, but the conversion of ethane at this temperature is only 6%; when the temperature is raised to 400°C, the conversion of ethane is increased to 37%, while the selectivity toward ethylene is reduced to 85%. Using physical and chemical means (XPS, SEM), it is found that the lack of oxidant in the reaction mixture leads to irreversible changes in the catalyst, i.e., reduced selectivity and activity. Raising the reaction temperature to 400°C allows the reduction of tellurium by ethane, from the +6 oxidation state to the zerovalent state, with its subsequent sublimation and the destruction of the catalytically active and selective phase; in its characteristics, the catalyst becomes similar to the Mo–V–Nb–O system containing no tellurium.

About the authors

I. I. Mishanin

Department of Chemistry

Author for correspondence.
Email: arnochem@yandex.ru
Russian Federation, Moscow, 119991

A. N. Kalenchuk

Department of Chemistry; Zelinsky Institute of Organic Chemistry

Email: arnochem@yandex.ru
Russian Federation, Moscow, 119991; Moscow, 119991

K. I. Maslakov

Department of Chemistry

Email: arnochem@yandex.ru
Russian Federation, Moscow, 119991

V. V. Lunin

Department of Chemistry; Zelinsky Institute of Organic Chemistry

Email: arnochem@yandex.ru
Russian Federation, Moscow, 119991; Moscow, 119991

A. E. Koklin

Zelinsky Institute of Organic Chemistry

Email: arnochem@yandex.ru
Russian Federation, Moscow, 119991

E. D. Finashina

Zelinsky Institute of Organic Chemistry

Email: arnochem@yandex.ru
Russian Federation, Moscow, 119991

V. I. Bogdan

Department of Chemistry; Zelinsky Institute of Organic Chemistry

Email: arnochem@yandex.ru
Russian Federation, Moscow, 119991; Moscow, 119991

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