Effect of 1-olefin addition on supercritical phase Fischer-Tropsch synthesis over Co/SiO{sub 2} catalyst

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:324739

Yan, S R; Zhang, Z X; Zhou, J L ^[1]; Fan, L; Fujimoto, Kaoru ^[2]

---

1. Chinese Academy of Sciences, Taiyuan, Shanxi (China). Inst. of Coal Chemistry
2. Univ. of Tokyo (Japan). Dept. of Applied Chemistry

Hydrocarbon wax produced by Fischer-Tropsch Synthesis (FTS) has been used in many fields for its high quality, such as high melting point, high hardness value, low viscosity, being nitrogen sulfur and aromatics-free. Selective synthesis of FT wax has generated great interest, especially in the case of lower oil-prices. As a polymerization process, however, in conventional gas phase FTS, selectivity of wax is constrained by the Anderson-Schultz-Flory (ASF) kinetics. Supercritical phase Fischer-Tropsch synthesis co-fed with 1-tetradecene over Co/SiO{sub 2} catalysts has been carried out. It was found that added 1-tetradecene could reach the surface of the catalyst by the aid of a supercritical fluid, and participate in the chain growth process there, which was indistinguishable from the original chain propagation. Consequently, the yield of hydrocarbons larger than C{sub 14} increased significantly, while the selectivity of C{sub 1}-C{sub 13} decreased correspondingly, which made the carbon number distribution deviate from ASF kinetics drastically. In addition, the analytical results of wax showed that average molecular weight and degree of saturation of the wax increased, while the content of oxygenates in the wax decreased due to the addition of 1-tetradecene.

• OSTI ID: 324739
• Report Number(s): CONF-970931--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ALKENES
CATALYTIC EFFECTS
CHEMICAL REACTION YIELD
COBALT
FISCHER-TROPSCH SYNTHESIS
MOLECULAR WEIGHT
ORGANIC OXYGEN COMPOUNDS
SILICON OXIDES
SUPERCRITICAL STATE
WAXES