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This study proposes a gas-cleaning process for the simultaneous removal of sulfur compounds, tar, and particles from biomass-gasified gas using Fe-supported activated carbon and a water-gas shift reaction. On a laboratory scale, the simultaneous removal of H 2 S and COS was performed under a mixture of gases (H 2 /CO/CO 2 /CH 4 /C 2 H 4 /N 2 /H 2 S/ COS/steam). The reactions such as COS + H 2 → H 2 S + CO and COS + H 2 O → H 2 S + CO 2 and the water-gas shift reaction were promoted on the Fe-supported activated carbon. The adsorption capacity with steam was higher than that without steam. On a bench scale, the removal of impurities from a gas derived from biomass gasification was investigated using two activated filters packed with Fe-supported activated carbon. H 2 S and COS, three-and four-ring polycyclic aromatic hydrocarbons (PAHs), and particles were removed and a water-gas shift reaction was promoted through the first filter at 320-350 °C. The concentrations of H 2 S and COS decreased to less than 0.1 ppmv. Particles and the one-and two-ring PAHs, except for benzene, were then removed through the second filter at 60-170 °C. The concentration of tar and particles decreased from 2428 to 102 mg Nm and from 2244 to 181 mg Nm −3 , respectively.

Energy｛m(1Environment R＆D Center，Tokyo Electric Power Company(4−l Egasaki−cho，Tsurumi−ku，Yokohama 230−8510，Japan) apresent：Kyoto Yamashina Laboratory，DAICHIKOEN CO．，HD．(4Misasagi Torinomukai−cho，Yamashina−ku，Kyoto 607−8408，Japan) b幽nsai Research Institute(Kyoto Research Park17，Chudoji Minami−machi，Shimogyo−ku，Kyoto600−8813，JapIm) cCentral Technical Research Laboratory，Nippon Mitsubishi Oil Corporation(8Chidori−cho，Naka−ku，Yokohama231− 0815，Japan) ．

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