Temperature-programmed oxidation of coke deposited by 1-octene on cracking catalysts

Title
Temperature-programmed oxidation of coke deposited by 1-octene on cracking catalysts
Publication Date
1999
Author(s)
Li, Chao'en
Brown, Trevor C
( author )
OrcID: https://orcid.org/0000-0003-0008-1309
Email: tbrown3@une.edu.au
UNE Id une-id:tbrown3
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
American Chemical Society
Place of publication
United States of America
DOI
10.1021/ef980265n
UNE publication id
une:22536
Abstract
The properties of coke deposited by 1-octene on fresh cracking catalysts have been investigated by analyzing CO, CO₂, and H₂O evolution during temperature-programmed oxidation (TPO). Of particular significance in the analysis is that the combustion mechanism dependence of the CO and CO₂ profiles were taken into account. Catalysts were laboratory coked at temperatures ranging from 200 to 600 °C under otherwise identical conditions. Two types of coke are identified, with the quantity of saturated coke decreasing and polyaromatic coke increasing as the coking temperature is raised. Trends, which are observed in the combustion rate-determining steps, indicate increased stability of the polyaromatic coke. Major differences in the TPO profiles of an industrial spent cracking catalyst, when compared with the laboratory-coked samples, suggest differences in the propensity for oxide formation. Reaction orders with respect to oxygen partial pressures indicate that the intrinsic rate of carbon monoxide evolution is independent of oxygen while carbon dioxide formation shows a more complicated dependence. It follows from the isokinetic temperature for the evolution of carbon dioxide from all substrates that the characteristic vibrational frequency is 674±31 cm-¹, which corresponds to the bending motion of CO₂.
Link
Citation
Energy & Fuels, 13(4), p. 888-894
ISSN
1520-5029
0887-0624
Start page
888
End page
894

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