Temperature program adsorption of hydrogen sulfide by NaOH-impregnated activated carbons for hot fuel gas purification

2011 IEEE Conference on Clean Energy and Technology (CET) Pub Date : 2011-06-27 DOI:10.1109/CET.2011.6041502

Russamee Sitthikhankaew, Somrudee Predapitakkun, R. Kiattikomol, Sudhibhumi Pumhiran, S. Assabumrungrat, N. Laosiripojana

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引用次数: 1

Abstract

Natural gas, biogas and synthesis gas from coal gasification contain hydrogen sulfide (H2S) that is toxic and strong odorous for human. It is high corrosive for engine. Among various methods for H2S removal, the adsorption by activated carbon is known as an efficient process for low concentration H2S removal. Moreover, activated carbon is not only inexpensive but also produces from agricultural waste in Thailand. The objective of this work is for upgrading the commercial-grade activated carbon by sodium hydroxide (NaOH) impregnation and the combination of steam activation and NaOH impregnation. The aim of upgrading is to improve the performance of H2S removal from fuel gases. The commercial and NaOH-impregnated activated carbons were tested by the temperature program adsorption of H2S at 30 °C and 550 °C. The results showed that the adsorption capacities of the NaOH-impregnated activated carbons are significantly higher than the commercial activated carbon (in the range of 2–21 times higher depending on the temperature of adsorption). At high temperature of adsorption, the adsorption capacity of the NaOH-impregnated activated carbon was 30.10 mg of H2S per gram of activated carbon. It can be concluded that the upgraded activated carbons is applicable for hot fuel gas purification. The concentration of H2S comes out at the outlet gas after treatment by the upgraded materials was almost 0 ppmv, which is safe for utilizing in fuel cell system and power engine.

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氢氧化钠浸渍活性炭对高温燃气净化硫化氢的温度程序吸附

天然气、沼气和煤气化合成气中含有硫化氢(H2S)，对人体有毒且有强烈气味。对发动机有高腐蚀性。在各种脱除H2S的方法中，活性炭吸附是一种高效的脱除低浓度H2S的方法。此外，活性炭不仅价格低廉，而且在泰国可以从农业废弃物中生产。采用氢氧化钠(NaOH)浸渍和蒸汽活化与NaOH浸渍相结合的方法对商品级活性炭进行了升级改造。升级的目的是提高从燃料气体中去除H2S的性能。在30℃和550℃条件下，对工业活性炭和氢氧化钠浸渍活性炭进行了温度程序吸附实验。结果表明，氢氧化钠浸渍活性炭的吸附能力明显高于工业活性炭(根据吸附温度的不同，其吸附能力可提高2 ~ 21倍)。在高温吸附条件下，naoh浸渍活性炭的吸附量为30.10 mg / g。结果表明，改性活性炭可用于热燃气净化。升级后的材料处理后，出口气体中H2S的浓度接近0 ppmv，可安全用于燃料电池系统和动力发动机。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2011 IEEE Conference on Clean Energy and Technology (CET)

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