Adsorption Removal of Hydrogen Sulfide by Activated Coke Produced from Wood Pellet in the Recycle System of Biomass

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Activated coke is produced from ligneous biomass molded pellets by different carbonization methods and conditions as the absorbents of hydrogen sulfide with the object of both the biomass recycle and the gas purification in a biomass gasification process. We clarified the differences of activated coke characteristics influenced by different production processes, such as the carbonization temperature, carbonization time and carbonization gases. The carbonization temperature was maintained from 723 to 1123 K, the carbonization time was set from 30 to 250 min and the carbonization gas used was either nitrogen or steam. The production process does not include the activation process for reducing the production steps and costs. The activated coke quality and characteristics that were evaluated were the specific surface area, pore size distribution, particle density and adsorption capacity of hydrogen sulfide. Other commercial adsorbents, such as activated carbon and activated char, were used to compare the adsorption performance. The measured adsorption performance of activated coke using the steam carbonization was better than that using the nitrogen carbonization. Comparing the activated coke with commercial absorbents, produced activated coke showed good adsorption results. There is a possibility of using activated coke in the gas purification process in a biomass recycling system instead of using expensive commercial adsorbents or other gas purification processes.

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