Study on biochar as desulfurizer for SOFC application
Study on biochar as desulfurizer for SOFC application
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DOI：
10.1002/fuce.202100025
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发表时间：
2021-10
期刊：
影响因子：
2.8
通讯作者：
H. Setiawan;Mio Sakamoto;Y. Shiratori
中科院分区：
文献类型：
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作者：
H. Setiawan;Mio Sakamoto;Y. Shiratori
沼气作为固体氧化物燃料电池（SOFC）运行的氢气来源的潜力，近年来受到了广泛关注。然而，为了实现以沼气为燃料的SOFC系统的商业水平的稳定性，必须消除沼气中的杂质，例如使重整催化剂和阳极材料中毒的H2S。在这项研究中，探索了一种使用生物炭的环境友好型沼气净化工艺。以竹子（BB）和稻壳（RH）为原料，在500°C、无氧气氛下热处理120 min，分别制备BB-和RH-生物炭BB-BC和RH-BC，然后用蒸汽或氨处理。对这些生物炭样品进行H2S吸附试验，并评价穿透容量（ACPH 2S（0））和总H2S吸附容量（ACPH 2S）。蒸汽处理有效地增加了BB-BC的ACPH 2S（0）和ACPH 2S，然而，强烈的蒸汽处理具有负面影响，特别是对于RH-BC，因为二氧化硅暴露在表面上。氨处理的生物炭形成的吡啶氮网站上的碳是相当有效的，以提高生物炭作为脱硫剂的性能。通过在900°C下对RH-BC进行氨处理，ACPH 2S（0）和ACPH 2S分别增加了2倍和30倍。
The potential of biogas as a source of H2 for the operation of solid oxide fuel cells (SOFC) has received much attention in recent years. However, in order to achieve commercial‐level stability of a biogas‐fueled SOFC system, impurities in biogas such as H2S, which poisons the reforming catalyst and anode material, must be eliminated. In this study, an environmentally‐friendly biogas purification process using biochar was explored. Bamboo (BB) and rice husk (RH) were chosen as starting materials and heat‐treated at 500°C for 120 min in an O2‐free atmosphere to produce BB‐ and RH‐derived biochars, BB‐BC and RH‐BC, respectively, then treated with steam or ammonia. H2S adsorption tests were performed for these biochar samples, and breakthrough capacity (ACPH2S(0)) and total H2S adsorption capacity (ACPH2S) were evaluated. Steam treatment effectively increased ACPH2S(0) and ACPH2S for BB‐BC, however, intense steam treatment had a negative effect, especially for RH‐BC because of the silica exposed on the surface. Ammonia treatment of biochar to form pyridinic N sites on the carbon surface was considerably effective to enhance the performance of a biochar as desulfurizer. By the ammonia treatment of RH‐BC at 900°C, ACPH2S(0) and ACPH2S increased by 2 and 30 times, respectively.