Simplification of temperature-programmed oxidation method to characterize petroleum cokes

• Published in: Fuel (Guildford) 2023-02, Vol.334, p.126548, Article 126548
• Main Authors: Lin, Cunhui, Yan, Chongxian, Zeng, Xingye, Shan, Shufeng, Zhao, Yingqiu, Duan, Linhai
• Format: Article
• Language: English
• Subjects: FCC slurry oil; Petroleum coke; Polarized-light microscopy; Temperature-programmed oxidation; X-ray diffraction
• ISSN: 0016-2361
• DOI: 10.1016/j.fuel.2022.126548

•A simplified TPO method was proposed to characterize petroleum cokes.•The effectiveness of the simplified TPO method was verified by application.•Polarized-light microscopy, XRD and TPO parameters were correlated. A series of carbonaceous materials with various structural orders were characterized by scanning electron microscopy (SEM), polarized-light microscopy, X-ray diffraction (XRD), and traditional temperature-programmed oxidation (TPO) method. A simplified TPO method was proposed, using Tmax (oxidation temperature corresponding to the maximum heat flow of the TPO profile) as the key parameter to indicate the structural orders of petroleum cokes. The Tmax parameter was compared to the Tmean parameter from traditional deconvolution of TPO profiles. The effectiveness of the simplified TPO method was verified in the characterization of petroleum cokes derived from multi-stage mild co-carbonization of FCC slurry oil narrow fractions. The Tmax parameter was further compared to the interlayer spacing parameter from XRD analysis in an attempt to correlate TPO oxidation reactivity and XRD structural parameter. The simplification of TPO method allows convenient characterization of the structural orders of petroleum cokes, especially when there are not sufficient coke samples available.