Performance of commercial and modified activated carbons for hydrogen sulfide removal from simulated biogas
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Publication Details
Author list: Sitthikhankaew R., Predapitakkun S., Kiattikomol R., Pumhiran S., Assabumrungrat S., Laosiripojana N.
Publisher: Hindawi
Publication year: 2011
Start page: 135
End page: 139
Number of pages: 5
ISBN: 9781457713545
ISSN: 0146-9428
eISSN: 1745-4557
Languages: English-Great Britain (EN-GB)
Abstract
In Thailand, biogas is one of a renewable energy that can be utilized for fuel and electricity generator. It contains methane (CH4), carbon dioxide (CO2), nitrogen (N2), Oxygen (O2) and a contaminant; hydrogen sulfide (H2S). H2S is toxicity and high corrosion for engine. H2S can be removed from biogas by adsorption over activated carbon, which can be produced from agricultural waste in Thailand. The purpose of this work is to test performance of commercial and modified activated carbons on H2S removal from simulated biogas at 30ฐC. Activated carbons were modified by steam activation, potassium hydroxide (KOH) impregnation and the combination of steam activation and KOH impregnation (S-KOH). Simulated biogas contain 3000 ppmv H2S, 40% CO2, 2% O2 and 70% humidity. It was found that modified activated carbons have adsorption capacity significantly higher than commercial activated carbon (in the range of 2-6 times higher depending on modification method). In detail, 1 gram of S-KOH can adsorb 84.75 mg of H2S. Furthermore, S-KOH removed H2S from 3000 ppmv into 0 ppmv for 100 minutes. It can be concluded that modified activated carbons are highly applicable for H2S removal in biogas at room temperature. Therefore, purified biogas is safe for using in household and industry. ฉ 2011 IEEE.
Keywords
activated carbon, adsorption, hydrogen sulfide, potassium hydroxide impregnation
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