Abstract
The local structures around Mo supported on USY zeolites containing different amounts of extra-framework Al species (EFAL) were investigated to elucidate the effects of EFAL on the location and dispersion of Mo sulfide catalysts. Mo K-edge EXAFS analysis indicated that Mo sulfide catalysts were highly dispersed and located, at least in part, in the micropores of USY zeolites, independent of the EFAL amounts. The dispersion of Mo sulfide was found to decrease with increasing amount of EFAL in the zeolites. EXAFS analysis of Mo oxide catalysts, the precursor of the sulfide catalysts, suggested that Mo oxide catalysts deposited on EFAL during the catalyst preparation were reluctant to disperse into micropores and formed larger MoS2 clusters during sulfiding that lowered the dispersion.
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