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A relation between the quadrupole splitting (Q.S. value) of the “Co-sulfide” phase and its sensitivity to exposure to ambient air could be established by means of Mössbauer 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 temperature 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 addition, for these catalysts air contact is found to give 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.

hyperfine interactions

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