Papadopoulos, GKStocker, MMcElhiney, GBerger, CPerez, MWeitkamp, JElia, MFZikanova, AKortunov, PVasenkov, SGlaser, RHansen, EWKarger, JJirglova, HKocirik, MTheodorou, DDrescher, BBernauer, BKrystl, VPulsed-field gradient nuclear magnetic resonance (PFG NMR) has been applied to study molecular diffusion in industrial fluid catalytic cracking (FCC) catalysts and in USY zeolite for a broad range of molecular displacements and temperatures. The results of this study have been used to elucidate the relevance of molecular transport on various displacements for the rate of molecular exchange between catalyst particles and their surroundings. It turned out that this rate, which may determine the overall rate and selectivity of FCC process, is primarily related to the diffusion mode associated with displacements larger than the size of zeolite crystals located in the particles but smaller than the size of the particles. This conclusion has been confirmed by comparative studies of the catalytic performance of different FCC catalysts. (c) 2005 Elsevier Inc. All rights reserved.http://hdl.handle.net/123456789/31433ISI:00022865840001810.1016/j.mri.2004.11.016232 SPEC. ISS.2332370730-725XengELSEVIER SCIENCE INCMagnetic Resonance Imagingparticle sizecomparative studydiffusionpulsed field gel electrophoresiscrystalcatalysisindustryFluid catalytic cracking catalystZeolitesfluid transporttemperaturePulsed-field gradientNuclear magnetic resonancepriority journalCatalysisDiffusionphysical chemistryMagnetic Resonance Spectroscopynuclear magnetic resonanceParticle Sizeconference paperzeolitecatalystmoleculePorosityPulsed-field gradient nuclear magnetic resonance study of transport properties of fluid catalytic cracking catalystsconferenceItem2005Ραδιολογία, Πυρηνική ιατρική και ΑπεικονιστικήRadiology, Nuclear Medicine and Imagingisi - Radiology, Nuclear Medicine & Medical Imaging covers resources on radiation research in biology and biophysics. Resources in this category focus on interventional radiology, investigative radiology, neuroradiology, radiotherapy, and oncology. Nuclear Medicine resources are concerned with the diagnostic, therapeutic, and investigative use of radionuclides. Medical Imaging resources are concerned with computerized medical imaging and graphics.Τεκμήριο συνεδρίουConference itemΕθνικό Μετσόβιο ΠολυτεχνείοGreek Aggregator OpenArchives.gr | National Documentation Centre (EKT)other