In this work, an aqueous pentaethylenehexamine (PEHA) solution was studied for CO₂ removal from bio-syngas for the first time. Firstly, pure CO₂ absorption in aqueous PEHA solution under different conditions was conducted, and 20 wt% PEHA solution was identified as the best option. Secondly, the capture of CO₂ was tested with synthetic syngas from a gas cylinder, and the species other than CO₂ showed a negligible impact on CO₂ removal. Finally, to evaluate the practical feasibility of using aqueous PEHA solution on the downstream CO₂ capture, the pilot experiments of gasification with boreal forest-based biomasses were designed to provide real syngas with a realistic distribution in composition for further testing. The results showed that the operating conditions and the type of feedstocks affected the distribution in the bio-syngas composition. Among these feedstocks, at the optimal oxygen supply, using spruce needles generated the highest yields of CO and H₂ and, meanwhile, gave rise to similar yields of other gases such as CO₂, CH₄, etc. The influence of the species other than CO₂ for CO₂ removal was negligible. Additionally, aqueous PEHA solution was tested as a biomass pretreatment agent, showing that no significant changes could be identified by the ultimate analysis (except for increased nitrogen content), but the yields of CO were affected negatively. On the other hand, when using the pretreated biomass by the aqueous PEHA solution, the NH₃ concentration in bio-syngas reached to the highest (4000 parts per million), which slightly affected the CO₂ absorption capacity and initial absorption rate of 20 wt% PEHA solution in a positive way.

在这项工作中，首次研究了五亚乙基六胺（PEHA）水溶液从生物合成气中去除CO ₂的能力。首先，在不同条件下在纯PEHA水溶液中进行纯CO ₂吸收，确定20％（重量）的PEHA溶液是最佳选择。其次，用来自气瓶的合成合成气测试了CO ₂的捕集，除CO ₂之外的其他物种对CO ₂去除的影响可忽略不计。最后，评估在下游CO ₂上使用PEHA水溶液的实际可行性捕获后，利用基于北方森林的生物质进行气化的先导实验旨在提供组成上具有实际分布的真实合成气，以供进一步测试。结果表明，操作条件和原料类型影响了生物合成气成分的分布。在这些原料中，以最佳的氧气供应量，使用云杉针头可产生最高的CO和H ₂收率，同时也产生了类似的其他气体（如CO ₂，CH ₄等）收率。比CO ₂的CO _2多去除微不足道。此外，测试了PEHA水溶液作为生物质预处理剂的效果，结果表明最终分析无法确定任何重大变化（氮含量增加除外），但CO的收率受到负面影响。另一方面，当通过PEHA水溶液使用预处理的生物质时，生物合成气中的NH ₃浓度达到最高（百万分之4000），这对CO _2的吸收能力和20 wt％的初始吸收率有轻微的影响。％PEHA溶液具有积极作用。