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Title
Effect of calcination temperature and composition on the spray-dried microencapsulated nanostructured SAPO-34 with kaolin for methanol conversion to ethylene and propylene in uidized bed reactor
Type of Research Article
Keywords
Microencapsulated SAPO-34 Calcination temperature Composition Spray drying Fluidized bed reactor Methanol to ole n
Abstract
The reported research can be related to the investigation of MTO catalysts prepared via spray drying method and the corresponding catalytic evaluation with the aim of improving SAPO-34 catalyst strength and reduce its abrasion. Slurry composition and calcination temperature effect on the production of uidizable micro- encapsulated catalysts was taken into account. Characterization of the spray dried samples was investigated by NH3-TPD, BET-BJH, XRD, EDX, FESEM, FTIR and TGA analysis. Intensity reduction of the re ections at 2θ à 12.5 and 24.7 and disappearing from the XRD pattern at calcination temperatures higher than 550 C proves the conversion of kaolinite phase to metakaolinite. The results demonstrate new Brønsted acid site for the spray dried sample compared to the results of bare SAPO-34. Thus, the optimized values for the composition of the spray drying slurry and the corresponding nal calcination temperature were reported for the uidizable MTO catalyst. KA-SAPO (S/K à 0.8 Al à 11 T à 550) catalyst was introduced as an acceptable catalyst in MTO process having life time of 900 min in uidized bed reactor.
Researchers Alireza ebrahimi (First Researcher)، (Second Researcher)، sogand Aghamohammadi (Third Researcher)