DXAFS study on the decarbonylation process of Mo(CO)(6) in NaY supercages

The decarbonylation process of Mo(CO)(6) in the NaY supercages was studied by means of a time resolved dispersive XAFS method during temperature progr ammed decarbonylation. XANES analysis demonstrated that the decarbonylation proceeded through two steps and that a stable intermediate existed between 440-490 K. The curve fitting analysis revealed that the intermediate was a molybdenum monomer subcarbonyl species coordinated by three CO ligands and three oxygen atoms of zeolite framework. Molybdenum dimer subcarbonyl spec ies were not observed. This study demonstrated that DXAFS technique is a po werful method to study the dynamic behaviour of the Mo carbonyl species dur ing decarbonylation process.