Gasification can provide -gas for consequent chemical production from carbon resources. The control of CO emission produced from gasification calls for the lower temperature and the more biomass char for the feed compared with traditional gasification, and the mechanism for steam gasification of different chars is more important. The gasification behaviors of four biomass chars and four coal chars are studied. The mechanism is probed using HO/HO period step tracing method coupled with various solid-state analyses on char structures. The increment of intermediates with increasing conversion demonstrate other slow step exists during gasification, and the solid state spectra of chars after and before gasification demonstrates that the condensation of poly-aromatic clusters in chars occurs accompanied with gasification. The addition reactions of radicals generated from gasifying agents and unsaturated carbon bonds C = C in chars is the slower step during gasification and enhancing the addition of radicals to unsaturated C = C bonds may be helpful for the higher gasification rate.

中文翻译：

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同位素示踪法研究不同焦炭的蒸汽气化机理


气化可以为随后的碳资源化学生产提供气体。与传统气化相比，控制气化产生的CO排放需要更低的温度和更多的生物质焦原料，并且不同焦炭的蒸汽气化机理更为重要。研究了四种生物质焦和四种煤焦的气化行为。使用 HO/HO 周期步长追踪方法结合对炭结构的各种固态分析来探讨该机制。中间体随着转化率的增加而增加，表明气化过程中存在其他缓慢的步骤，气化前后炭的固态光谱表明，炭中多芳族簇的缩合伴随着气化发生。气化剂产生的自由基与焦炭中不饱和碳键 C = C 的加成反应是气化过程中较慢的步骤，增强自由基对不饱和 C = C 键的加成可能有助于提高气化速率。