Effects of reaction conditions and organic sulfur compounds on coke formation and HZSM-5 catalyst performance during jet propellant fuel (JP-8) cracking

FUEL

卷:259

Article

Kim, Sungtak¹  Sasmaz, Erdem²  Pogaku, Ravindra²  Lauterbach, Jochen² 

[1] Chungnam Natl Univ, Dept Chem Engn & Appl Chem, Daejeon 34134, South Korea

[2] Univ South Carolina, Smartstate Ctr Strateg Approaches Generat Elect S, Dept Chem Engn, Columbia, SC 29201 USA

关键词: JP-8 cracking;    HZSM-5;    Deactivation;    Coking;    Sulfur poisoning;    Surrogate JP-8;   

DOI  :  10.1016/j.fuel.2019.116240

来源: Elsevier

【 摘 要 】

Coke formation and catalytic performance under various conditions, such as reaction period, temperature, presence of carrier gas and organic sulfur compounds in the feed, were investigated for JP-8 cracking over HZSM-5 catalysts. The spent HZSM-5 catalysts were characterized by N-2 adsorption/desorption, X-ray powder diffraction (XRD), Fourier-transform infrared spectroscope (FT-IR), Temperature programmed oxidation (TPO), and X-ray photoelectron spectroscopy (XPS). A significant loss of surface area and pore volume appeared in the initial period of the cracking reaction, owing to coke formation. Complex, aromatic structured coke formed and deposited on the surface the HZSM-5 catalyst. This resulted in high carbon content, carbon burn-off at higher temperatures, and a change in morphology to less well-defined shapes. As the reaction temperature increased, the aromaticity of the coke species increased, thereby resulting in the coke species having more carbon content and a lower H/C ratio. Furthermore, the absence of a carrier gas gave rise to faster catalyst deactivation and lower LPG yield. Surrogate JP-8 fuel experiments revealed that the aromatic sulfur compounds in the feed do not degrade the catalytic activity by sulfur poisoning, but rather by accelerated coke formation.

【 授权许可】

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