Dc(XJsition of coke on FCC catalyst received considerable attention in Catalysis field~little '{Irk has been reported on non-oxidative regeneration especially hyd~ogen at 300°C and high pressure of 20 bar for 8hrs over coked catalysts followed by extraction. The deficient h)'drogen type cracked catalyst was treated for 8hrs at different temperatures of25, 110 and 300'C. Coked zeolite was left under hydrogen pressure overnight to increase the adsorption time of hydrogen on zeolite surface and pores. Cyclic regenerations were applied on heavily coked catalysts to enhance the. volatility of coke precursors at longer time. Dcconvoluted peaks of TGA-DTG were showing several volatile peaks at certain dissociation temperatures indicating the type of coke. There was correlation between peaks of adsorbed materials of coke precursors in TGA and TPD. Hydrogen adsorbed above 400'e in TPD spectra i.mplies that high temperature hydrogen diffused through catalyst matrix nnd caused significant reduction and morphological changes of coke species. FTIR ptnks showed the intensity of the coke profiles appeared in coked and diminished in regenerated ones. The acidic and metallic sites of the deactivated catalyst were restored lIccording to their functional groups in FTIR spectra. Continuous regeneration of coked 5nmples wns showing gradual loss of coke percentage weight. Toluene and more polar wh-cnt like pyridine leached the hydrocarbon cOffiFOunds adsorbed on the surface of the . zeOlite before or after hydrocracking. The resulted extract was sent for GC-Ms to identify the kind of hydrocarbons products restored. The activity of FCC catalyst was restored by more than 60% due to the removal of polycyclic type of coke depending on the feed type. The regenerated catalyst can be used in catalytic reactions with high activity and selectivity for light products.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:486453 |
| Date | January 2007 |
| Creators | Ghaloum, Narjes |
| Publisher | University of Strathclyde |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
Page generated in 0.0015 seconds