Mesoporous MFI Zeolite Nanosponge Supporting Cobalt Nanoparticles as a Fischer鈥揟ropsch Catalyst with High Yield of Branched Hydrocarbons in the Gasoline Range

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• 作者：Jeong-Chul Kim ; Seungyeop Lee ; Kanghee Cho ; Kyungsu Na ; Changq Lee ; Ryong Ryoo
• 刊名：ACS Catalysis
• 出版年：2014
• 出版时间：November 7, 2014
• 年：2014
• 卷：4
• 期：11
• 页码：3919-3927
• 全文大小：409K
• ISSN：2155-5435

文摘

A zeolite nanosponge was obtained by a seed-assisted hydrothermal synthesis route using C₂₂H₄₅鈥揘⁺(CH₃)₂鈥揅₆H₁₂鈥揘⁺(CH₃)₂鈥揅₆H₁₃ as the structure-directing agent. The zeolite was composed of disordered network of 2.5-nm-thick MFI zeolite nanolayers having a narrow distribution of mesopore diameters centered at 4 nm. The highly mesoporous texture (mesopore volume = 0.5 cm³ g^鈥?) was suitable for supporting cobalt nanoparticles with a narrow distribution of particle diameters centered at 4 nm. The Co/MFI zeolite exhibited high stability of the Co nanoparticles against particle growth, and there was accordingly high catalytic conversion of carbon monoxide to hydrocarbons and long catalytic lifetime in the Fischer鈥揟ropsch synthesis. Furthermore, the Co/MFI catalyst exhibited high selectivity for branched hydrocarbons in the gasoline range (C₅鈥揅₁₁), compared to conventional alumina-based catalysts. This high selectivity could be attributed to hydroisomerization in the extremely thin zeolite frameworks that provided short diffusion path lengths for branched hydrocarbons.

Keywords:

Fischer鈭扵ropsch synthesis; bifunctional catalyst; hierarchical zeolite; uniform mesopore diameter; high cobalt dispersion; high gasoline yield