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Catalysts 2012, 2(2), 281-298; doi:10.3390/catal2020281
Article

Hot and Dry Cleaning of Biomass-Gasified Gas Using Activated Carbons with Simultaneous Removal of Tar, Particles, and Sulfur Compounds

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Biomass Technology Research Center, National Institute of Advanced Industrial Science and Technology, Kagamiyama 3-11-32, Higashihiroshima, Hiroshima 739-0046, Japan
* Author to whom correspondence should be addressed.
Received: 29 February 2012 / Revised: 11 April 2012 / Accepted: 18 April 2012 / Published: 8 May 2012
(This article belongs to the Special Issue Catalysts for Biomass Conversion)
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Abstract

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 H2S and COS was performed under a mixture of gases (H2/CO/CO2/CH4/C2H4/N2/H2S/COS/steam). The reactions such as COS + H2 → H2S + CO and COS + H2O → H2S + CO2 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. H2S 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 H2S 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−3 and from 2244 to 181 mg Nm−3, respectively.
Keywords: biomass; gasification; tar; particles; H2S; COS; activated carbons biomass; gasification; tar; particles; H2S; COS; activated carbons
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Hanaoka, T.; Matsunaga, K.; Miyazawa, T.; Hirata, S.; Sakanishi, K. Hot and Dry Cleaning of Biomass-Gasified Gas Using Activated Carbons with Simultaneous Removal of Tar, Particles, and Sulfur Compounds. Catalysts 2012, 2, 281-298.

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