Structural Analysis of Coke on Used Catalysts during Residue Hydrotreating by Ruthenium Ion Catalyzed Oxidation Reaction

Abstract

The structure of coke from five spent residue hydrotreating catalysts was investigated based on ruthenium ion catalyzed oxidation reaction. The distribution of n-alkyl chains and bridges attached to aromatic carbon of coke on catalysts was quantified. Results showed the concentrations of n-alkyl chains and bridges in coke were declined with the increase of carbon number. The substituential group is methyl mainly, and it had no >C 5 alkyl chains in coke. Various isomeric benzenepolycarboxylic acids from oxidated products were identified. Then the condensation mode of some aromatic structure was discussed. The precursor of coke affected the coke structure. Catalysts made coke dehydrogenate to form graphite type aromatic condensate. About 60% of coke was graphite type.

Ruthenium Ion-Catalyzed Oxidation for Petroleum Molecule Structural Features: A Review

“…However, by combining the compositions of all other products, the most likely logical explanation for the formation of dicarboxylic acids is from oxidized naphthenic ring in the partial saturated aromatics, based on the presence of (1) abundant 1,4-butanedioic acid, 1,5-pentanedioic acid, and 1,6-hexanedioic acid, which were the only dicarboxylic acids detected in the RICO products; (2) increased abundance of these compounds in deep hydroprocessed products; and (3) the longest alkyl chain of fatty acids which was C 5 [88].…”