Catalytic Role of Pyrite on Hydrodesulfurization of Lignite and Asphaltite

2016-04-20
Halvaci, Veysi
Kanca, Arzu
Üner, Deniz
Pyrite, FeS2 , naturally present in solid fuels can act as catalysts during hydrogenation processes. In general, metal sulfide catalysts are used as hydrogenation and hydrodesulfurization processes of petroleum fractions. The defects in crystal lattice were considered as the responsible parts of catalytic activity. Therefore, the presence of metal sulfide active sites in the structure increases the process efficiency. Since pyrite is a metal sulfide present in the coal structure, Guin et al. reported a higher reaction rate in the presence of pyrite during hydrogenation process [1]. In this study, catalytic effect of pyrite has been investigated by hydrogenation of a high sulfur Turkish lignite and asphaltite at atmospheric pressure. The first results of hydrogenation experiments for Tuncbilek lignite with high pyrite content (2.6% in weight) revealed that H2 reduction decreases the sulfur contents considerably. Additionally, the amount of residual carbon decreased as observed from the decrease in CO2 formation rate of hydrogenation residue during TPO. These effects are interpreted for the catalytic effect of pyrite [2]. Hydrodesulfurization of Şırnak asphaltite with 1.59% pyrite, is carried out under 100 sccm flow of 10% H2 and balance N2 . Gas and liquid product analysis indicated that hydrogenation of asphaltite results in a significant decrease in total sulfur while producing nearly 20% liquid fuel, which contains organics from C6 to C26.
Citation Formats
V. Halvaci, A. Kanca, and D. Üner, “Catalytic Role of Pyrite on Hydrodesulfurization of Lignite and Asphaltite,” presented at the 6th National Catalysis Conference (27 - 30 Nisan 2016), Bursa, Türkiye, 2016, Accessed: 00, 2021. [Online]. Available: http://ncc6.btu.edu.tr/index.php?sid=6680.