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- W2576363721 abstract "Catalyst deactivation is a problem of great and continuing concern in residue hydroprocessing operations. It is widely accepted that the deactivation of hydrotreating catalysts is to a great extent caused by coke deposition. Three used commercial catalysts were studied by solid-state 13 C NMR to derive structural information on the coke. 13 C NMR spectral editing (cross polarization technique in combination with the polarization inversion pulse sequence) was applied to distinguish on the one hand between quaternary and tertiary aromatic carbon and on the other hand between secondary and primary aliphatic carbon. Structural parameters, derived from those NMR measurements in combination with the aromaticity from single pulse excitation 13 C NMR and the H/C ratio from elemental analysis, have been used to obtain structural information on coke." @default.
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- W2576363721 date "2014-01-01" @default.
- W2576363721 modified "2023-09-27" @default.
- W2576363721 title "Application of solid-state NMR methods in Coke characterization" @default.
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- W2576363721 hasPublicationYear "2014" @default.
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