Some aspects of the stability of the so-called "Co-Mo-S" phase present in sulfided carbon-supported Co and CoMo catalysts : a Mössbauer emission spectroscopic study

M.W.J. Crajé, V.H.J. Beer, de, A.M. Kraan, van der

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Abstract

A relation between the quadrupole splitting (Q.S. value) of the Co-sulfide phase and its sensitivity to exposure to ambient air was established by means of Moessbauer emission spectroscopy (MES). For both Co/C and CoMo/C catalysts showing a quadrupole doublet with a large Q.S. value (1.20-1.30 mm/s), air exposure at room temp. for one day did not cause significant changes in the MES spectrum. In the case of catalysts showing a doublet with a smaller Q.S. value, exposure to ambient air resulted in the presence of a high-spin 2+ doublet. In addn., for these catalysts air contact gave rise to an increase of the Q.S. value of the Co-sulfide phase, which points to an increased dispersion of the Co-sulfide phase. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)799-802
Number of pages4
JournalHyperfine Interactions
Volume69
Issue number1-4
DOIs
Publication statusPublished - 1992

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