Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/4697
Title: Coke content of spent commercial fluid catalytic cracking (FCC) catalysts: Determination by temperature-programmed oxidation
Authors: Bayraktar, Oğuz
Kugler, Edwin L.
Keywords: Coke measurement
FCC catalysts
Metal contamination
Temperature-programmed oxidation
Zeolites
Issue Date: 2003
Publisher: Springer Verlag
Source: Bayraktar, O., and Kugler, E. L. (2003). Coke content of spent commercial fluid catalytic cracking (FCC) catalysts: Determination by temperature-programmed oxidation. Journal of Thermal Analysis and Calorimetry, 71(3), 867-874. doi:10.1023/A:1023382327595
Abstract: Zeolite catalysts are widely used in oil refinery and petrochemical industries. Fluid catalytic cracking (FCC) catalysts used in a refinery consist of Y zeolite, a silica-alumina matrix and a binder. In this study, spent FCC catalysts were prepared by cracking sour imported heavy gas oil (SIHGO) in a microactivity test unit. The total amount of coke and the hydrogen-to-carbon ratio (H/C) in the coke for spent FCC catalysts contaminated with metals were determined using temperature-programmed oxidation (TPO). Total H/C ratios of the coke on FCC catalysts were found to be in the range of 0.4 to 1, indicating the majority of the coke consists of polyaromatic species. H/C ratio decreased with increasing coke contents on the catalysts. This ratio was found to be higher for the catalyst with high metal concentration compared to the catalyst with relatively low metal concentration. The high H/C ratio for highly contaminated FCC catalyst was attributed to the formation of hydrogen rich coke by hydrogenation reactions catalyzed by the contaminant metals on the catalyst. After hydrogen pre-treatment both coke amount and H/C ratio decreased significantly. This was due to the decrease in the hydrogenation activities of the contaminant-metals in their reduced forms.
URI: http://doi.org/10.1023/A:1023382327595
http://hdl.handle.net/11147/4697
ISSN: 1388-6150
1388-6150
Appears in Collections:Chemical Engineering / Kimya Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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