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EXAFS was used in this paper to study 4 sulfided catalysts that have the same structure as their {sup 57}Co counterparts characterized by Mossbauer emission spectroscopy. The {open_quotes}Co-Mo-S{close_quotes} phase in Co/C is similar to CoMo/C due to a very highly dispersed Co species. Without Mo, the sulfidic Co results in a Co{sub 9}S{sub 8} phase during sulfidation at 673K, Mo prevents Co sintering in CoMo/C. 37 refs., 6 figs., 2 tabs.

the journal of physical chemistry

An EXAFS study on the so-called "cobalt-molybdenum-sulfur" phase in cobalt/carbon and cobalt-molybdenum/carbon, compared with a Moessbauer emission spectroscopy study