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The ability of Rh based catalysts to remove undesired tars from biomass-derived syngas was examined under realistic operating conditions. Experiments were performed in a fixed bed reactor at temperatures of 650-850 °C and atmospheric pressure using C 6 H 6 as a model tar compound. Benzene conversion exhibited a strong dependence on temperature and H 2 O concentration in the feed. Significantly better catalyst performance was observed upon addition of Ce to the catalyst, which increased Rh dispersion and stability. The concentration of C 6 H 6 in the feed had very little effect on catalyst performance. CO 2 , H 2 , and CO cofeeds had positive, neutral, and negative effects, respectively, on C 6 H 6 conversion. A representative biomass-derived syngas mixture of N 2 , H 2 , CO, CO 2 , H 2 O, and C 6 H 6 was tested on the Rh-Ce catalyst at 850 °C and 2 SLPM total flow rate, resulting in almost complete C 6 H 6 conversion to a near equilibrium product stream.

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