Effects of carrier gas on the properties of soot produced by ethylene pyrolysis

• Published in: Fuel processing technology 2021-03, Vol.213, p.106673, Article 106673
• Main Authors: Araki, Yoichiro, Matsukawa, Yoshiya, Saito, Yasuhiro, Matsushita, Yohsuke, Aoki, Hideyuki, Era, Koki, Aoki, Takayuki
• Format: Article
• Language: English
• Subjects: Carrier gas effect; Carrier gases; Crystallites; Ethylene; Helium; Nucleation; Particle size distribution; Primary particle diameter; Pyrolysis; Soot; Soot properties
• ISSN: 0378-3820; 1873-7188
• DOI: 10.1016/j.fuproc.2020.106673

Herein, we investigate the mechanism of soot formation produced by controlled-temperature pyrolysis of ethylene in Ar, He, or N2 and analyze the size distributions of soot particles to understand soot aggregation and nucleation behavior. Additionally, we probe the reactivity of soot, revealing that soot particles were highly unlikely to react with molecules of the above carrier gases. The use of Ar is demonstrated to promote soot production, facilitate crystalline growth, and increase the diameter of primary soot particles, while the use of He has an opposite effect, which is ascribed to the large size of the former molecules and the small size of the latter ones. Consequently, the soot generation mechanism is found to be affected by carrier gas type. •We evaluated effects of carrier gas on soot particle formation in inert gas atmosphere.•Soot particles were generated in Ar, He, or N2 atmosphere.•Soot properties and production were investigated using Raman spectroscopy, XRD, and scanning mobility particle sizer.•Atmospheric gas with larger molecules promotes soot production and graphitization.