During biomass gasification, both the char physical properties and the biomass inorganic composition are known to have a significant influence on the reaction kinetics. However, the impact of the inorganic content is more pronounced than the impact of the char features, though no clear explanations have been found in the literature yet. In order to clarify this point, two biomass species with significant inorganic composition differences were gasified under steam and the chars obtained at various conversion values were characterized. Both the char physicochemical properties (chemical composition, carbon structure, porosity, and surface chemistry) and the gasification kinetic behavior were analyzed. A particular focus on the inorganic elemental composition and inorganic compound nature were performed. Experimental results were compared with simulation results at thermodynamic equilibrium obtained with the FactSage 7.2 software. The results showed that the physical properties of the carbon matrix do not have a strong influence on the gasification reactivity. In contrast, the inorganic composition could explain the differences between the gasification kinetic behaviors of the two investigated chars (obtained starting from two different biomass sources).

在生物质气化期间，已知炭的物理性质和生物质无机组成均对反应动力学具有重大影响。然而，尽管在文献中还没有找到明确的解释，但是无机物含量的影响比炭特征的影响更为明显。为了阐明这一点，在蒸汽下气化了具有明显无机组成差异的两种生物质，并表征了在各种转化值下获得的焦炭。分析了炭的物理化学性质（化学组成，碳结构，孔隙率和表面化学性质）和气化动力学行为。进行了对无机元素组成和无机化合物性质的特别关注。将实验结果与通过FactSage 7.2软件获得的热力学平衡模拟结果进行比较。结果表明，碳基体的物理性质对气化反应性没有很大的影响。相比之下，无机成分可以解释两种所研究的炭（从两种不同的生物质来源获得）的气化动力学行为之间的差异。