Citation: WEI Jian, MA Xian-gang, FANG Chuan-yan, GE Qing-jie, XU Heng-yong. Iron-silica nanocomposites as a catalyst for the selective conversion of syngas to light olefins[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(7): 827-832. shu

Iron-silica nanocomposites as a catalyst for the selective conversion of syngas to light olefins

1.
1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;

Corresponding author: GE Qing-jie,
Received Date: 22 January 2014
Available Online: 12 March 2014

A series of Fe/SiO₂ catalysts were prepared by one-pot synthesis and conventional co-precipitation methods; they were characterized by N₂ physisorption, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and temperature-programmed reduction. The performances of the Fe/SiO₂ catalysts in Fischer-Tropsch synthesis (FTS) were evaluated in a fixed-bed reactor for the production of light olefins from syngas. The results showed that in the Fe/SiO₂ catalyst prepared by one-pot synthesis method, the iron oxide is present as iron-silica nanocomposite in the form of Fe₃O₄ (magnetite). Compared with the catalyst prepared by conventional co-precipitation method, the magnetite-silica nanocomposite by one-pot synthesis exhibits a more uniform spherical-like morphology, narrower size distribution (30 nm in average) and better reducibility. In FTS, the Fe/SiO₂ catalyst prepared by one-pot synthesis method exhibits higher activity and selectivity to light olefin as well as lower selectivity to methane and better stability.
- syngas,
- Fischer-Tropsch synthesis,
- light olefins,
- magnetite,
- nanocomposites
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