H2-poor bio-synthesis gas model consists of H2 and CO of different molar H2/CO-ratios (2.1, 1.5, and 1) 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 ∼ 2.1 above the catalyst surface. For the ratios < 2.1, a water-gas- shift activity is desired 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. This is an abstract of a paper presented at the 231st ACS National Meeting (Atlanta, GA 3/26-30/2006).