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.

Cite: Mishanin I.I. , Kalenchuk A.N. , Maslakov K.I. , Lunin V.V. , Koklin A.E. , Finashina E.D. , Bogdan V.I.
Deactivation of a mixed oxide catalyst of Mo–V–Te–Nb–O composition in the reaction of oxidative ethane dehydrogenation
Russian Journal of Physical Chemistry A. 2016. V.90. N6. P.1132-1136. DOI: 10.1134/s0036024416060133 WOS Scopus OpenAlex

Identifiers:

Web of science:	WOS:000376605500005
Scopus:	2-s2.0-84971671373
OpenAlex:	W2396603143

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OpenAlex	20
Scopus	18
Web of science	16

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