Rational design of syngas to isoparaffins reaction route over additive dehydrogenation catalyst in a triple-bed system

• Published in: Catalysis communications Vol. 131; p. 105799
• Main Authors: Zhang, Guihua, Amoo, Cederick Cyril, Li, Mingquan, Wang, Jingyan, Lu, Chengxue, Lu, Peng, Xing, Chuang, Gao, Xinhua, Yang, Ruiqin, Tsubaki, Noritatsu
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-11-2019
• Subjects: Dehydrogenation; Fischer-Tropsch synthesis; Isoparaffins; Olefins; ZnO; Isoparaffins; Fischer-Tropsch synthesis; ZnO; Dehydrogenation; Olefins
• ISSN: 1566-7367; 1873-3905
• DOI: 10.1016/j.catcom.2019.105799

The product of an ideal Fischer-Tropsch synthesis (FTS) reaction contains mainly linear hydrocarbons (paraffins and olefins) with limited selectivity for isoparaffins. In this work, a triple-bed with Co-SiO2 followed by ZnO-SiO2 and ZSM-5 catalysts is employed to demonstrate a promising route to enhance isoparaffins in the FTS reaction. The rationale of this route involves induction of olefins into the hydrocarbon stream prior to isomerization. Optimum olefin induction was achieved with 2%ZnO-SiO2 catalyst. The FTS reaction results showed remarkably high selectivity, ca. ~40% for isoparaffins, thus giving high prospects as a new route to synthesize high octane number fuels from syngas.
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•A triple-bed catalyzed FTS reaction demonstrates a route to enhance isoparaffins.•The catalytic system consists of 10%Co-SiO2, 2%ZnO-SiO2 and ZSM-5 in sequence.•Results show remarkable increase in isoparaffins.•Introducing ZnO-SiO2 produces more olefins, which enhance isoparaffins selectivity.