| Popis: |
A variety of characterization techniques have been applied to probing the structure - selectivity interrelationship in the selective dehydrocyclization catalyst platinum-loaded zeolite L. Powder X-ray (PXD) and neutron diffraction (PND) have yielded precise data on framework geometries, aluminum partitionings (and, at Si:Al = 1.0, evidence for long range Si:Al ordering), and the non-framework cation configurations. Hydrocarbon location and motional characteristics have been probed by PND and 2H nmr respectively, complemented by computer simulations. The preferred Pt atom sites in the zeolite loaded with Pt at high dispersion remain unmeasured, although insight has been gleaned from simple hard-sphere modeling. Aggregated Pt clusters can be detected by electron microscopy and high resolution PXD. |
