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Preliminary study of the E. S. R signals in unsupported cobalt sulfide-molybdenum sulfide mixed masses.

✍ Scribed by G. Hagenbach; F. Menguy; B. Delmon

Publisher
Wiley (John Wiley & Sons)
Year
2010
Weight
257 KB
Volume
83
Category
Article
ISSN
0037-9646

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✦ Synopsis

Abstract

Unsupported cobalt sulfide‐molybdenum sulfide mixed catalysts exhibit two distinct E. S. R. signals. A first signal (g= 2.007, ΔH=90G) is detected at room temperature. It is attributed to Mo^5+^. The Mo^5+^ content decreases with increasing Co content, from a value Mo^5+^/Mo of 0.01% with pure molybdenum sulfide, to negligible values for Co/(Co + No) > 0.5. A second, low temperature, signal gradually appears between 143 and 133°K (g = 2.17, ΔH = 300‐600G). It is apparently related to some cobalt containing species. This signal, practically negligible for each monometallic sulfide, exhibits a sharp maximum for a value Co(Co + Mo) of 0.2, which corresponds to maximal intrinsic (per m^2^) catalytic activities of the samples in the hydrogenolysis of thiophene, hydrogenation of cyclohexene and isomerization of cyclohexane.

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