Characterization of fluid catalytic cracking catalyst coke by C-13 NMR and mass spectrometry

B J McGhee, J M Andresen, C E Snape, R Hughes, C L Koon, G Hutchings

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Coke has been concentrated from deactivated FCC catalysts via demineralisation to facilitate characterisation by solid state C-13 NMR and mass spectrometry. The catalysts were obtained from refinery operations with a residue feed and a hydrotreated vacuum gas oil and from microreactivity runs with n-hexadecane and various additives. As for solid fuels, the use of a low-field spectrometer in conjunction with the single pulse excitation (or Bloch decay) technique has enabled quantitative carbon skeletal parameters to be obtained from C-13 NMR for the cokes. Internal standard measurements demonstrated that most of the carbon is detectable by SPE and, therefore, NMR-invisible graphitic layers are not thought to be major structural features of the cokes. Differences in feedstock composition were reflected in the structure of the cokes with the aromatic nuclei being most highly condensed in the residue-derived coke and corresponding to 15-20 peri-condensed aromatic rings.

Original languageEnglish
Title of host publicationDeactivation and Testing of Hydrocarbon-Processing Catalysts
EditorsP O'Connor, T Takatsuka, GL Woolery
Place of PublicationWashington
PublisherAmerican Chemical Society
Pages117-132
Number of pages16
Volume634
ISBN (Electronic)9780841215832
ISBN (Print)9780841234116
DOIs
Publication statusPublished - 1996
EventSymposium on Deactivation and Testing of Hydrocarbon-Processing Catalysts, at the 210th National Meeting of the American-Chemical-Society - CHICAGO
Duration: 20 Aug 199525 Aug 1995

Conference

ConferenceSymposium on Deactivation and Testing of Hydrocarbon-Processing Catalysts, at the 210th National Meeting of the American-Chemical-Society
CityCHICAGO
Period20/08/9525/08/95

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