Direct use of H2-poor bio-syngas model in Fischer-Tropsch synthesis over un-promoted and rhenium promoted alumina-supported cobalt catalysts

FUEL 29

Dewi Tristantini, dtristantini@yahoo.com1, Sara Lögdberg, logdberg@ket.kth.se2, Börje Gevert, gevert@chem.chalmers.se1, Oyvind Borg, borg@chemeng.ntnu.no3, and Anders Holmen, holmen@chemeng.ntnu.se3. (1) Department of Chemical and Biological Engineering, Chalmers University of Technology, Kemivägen 10, Gothenburg, 41296, Sweden, (2) Department of Chemical Technology, KTH-Royal Institute of Technology, Stockholm, S-10044, Sweden, (3) Department of Chemical Engineering, NTNU-Norwegian University of Science and Technology, Trondheim, N-7491
H2-poor bio-syngas model consists of H2 and CO of different molar H2/CO-ratios (2.1, 1.5 and 1.0) were applied for a fixed bed Fischer-Tropsch (FT) reactor over Co/Al2O3 and Co-Re/Al2O3 catalysts. The FT-reaction requires a H2/CO-molar-ratio of approximately 2.1 above the catalyst surface. For the ratios lower than 2.1, a water-gas-shift activity is desired in order to increase the H2/CO-ratio. With lower H2/CO-ratios in the feed, the CO conversion and the CH4 selectivity decreased, while the C5+ selectivity and C3(olefin/paraffin) ratio were slightly increased. However, the catalysts studied had very low water-gas-shift activities. The Re-promoted was considerably more active and selective to longer hydrocarbons. The characterization of catalysts showed the positive effect of the Re in dispersion and reducibility of the catalysts. It is possible to utilize the advantages of an inlet ratio of 1.0 (higher selectivity to C5+, lower selectivity to CH4) if a low CO conversion is accepted.
 

Biofuels for Transportation
1:30 PM-4:45 PM, Sunday, 26 March 2006 Georgia World Congress Center -- C204, Oral

Division of Fuel Chemistry

The 231st ACS National Meeting, Atlanta, GA, March 26-30, 2006