Effect of H 2 S co-feeding on the performance of the Fe/SiO 2 catalyst for isomerization and dehydrogenation of C 5 -monoolefin

• Published in: New journal of chemistry 2024-02, Vol.48 (8), p.3357-3363
• Main Authors: Karasawa, Fumiya, Watanabe, Ryo, Verma, Priyanka, Miyagi, Yuichi, Yamada, Hikaru, Miyanari, Setsuko, Fukuhara, Choji
• Format: Article
• Language: English
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/D3NJ04923J

In this study, we aimed to produce isoprene, a diolefin, from a mono-olefin produced by the dehydrogenation of isopentane (iso-C 5 ). Specifically, we attempted to isomerise 2-methyl-2-butene (2M2B), a C 5 mono-olefin, followed by dehydrogenation to produce isoprene. The reaction characteristics of the Fe/SiO 2 catalysts were investigated in detail. In the presence of hydrogen sulphide (H 2 S), 2M2B was converted to 2-methyl-1-butene (2M1B) and the target product, isoprene. However, in the absence of H 2 S, only the isomerisation reaction proceeded, producing 2M1B; isoprene was not produced. Notably, the isoprene yield remained almost unchanged when the concentration of H 2 S decreased. Furthermore, when isoprene was produced by mixing iso-C 5 and mono-olefins (2M2B and 2M1B), the amount of isoprene produced was significantly higher than that from iso-C 5 alone. These results indicate that our synthetic strategy is promising for isoprene production.