XAFS analysis of unsupported MoS2 catalysts prepared by two methods

Structural analysis by XAFS method was applied to two kinds of unsupported molybdenum disulfide catalysts. Assuming a structural model consisting of c rystalline and non-crystalline parts, curve fitting analysis was performed for the catalysts. The residual XAFS after subtraction of the crystalline c ontribution showed that the structure of the non-crystalline part uas signi ficantly different between the catalysts prepared by the two methods. It wa s suggested that EXAFS would give the average size of the micro-domains, wh ile other methods such as TEM and TPR Would give the size of macro-domains.