In this paper, the ability of an ash-coated olivine to catalyze the steam gasification of biomass-derived char is investigated in a laboratory reactor. The olivine investigated is a sample from the Chalmers dual fluidized bed gasifier and it has been activated by the in-bed addition of S and K 2 CO 3 . The char and bed material samples were analyzed by Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy (SEM-EDS). It is shown that the ash layer coating of the olivine can catalyze the steam gasification of char by transferring catalytic potassium (K) to the char particles. The mobilities of the catalytic species from the olivine ash-layer are discussed. This work furthers the current understanding of the catalytic activities of ash-coated bed material particles during the thermochemical conversion of carbonaceous feedstocks in fluidized beds. In addition, it complements the existing literature on catalytic bed materials, which to date have focused on tar removal and improving gas quality.

中文翻译：

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床层材料作为焦炭气化的催化剂：以 K 和 S 加成活化的灰涂层橄榄石为例

在本文中，在实验室反应器中研究了灰涂层橄榄石催化生物质衍生炭的蒸汽气化的能力。所研究的橄榄石是来自 Chalmers 双流化床气化炉的样品，它已通过床内添加 S 和 K 2 CO 3 进行活化。通过扫描电子显微镜结合能量色散 X 射线光谱 (SEM-EDS) 分析炭和床材料样品。结果表明，橄榄石的灰层涂层可以通过将催化钾（K）转移到炭颗粒上来催化炭的蒸汽气化。讨论了橄榄石灰层中催化物质的迁移率。这项工作进一步加深了目前对流化床中含碳原料热化学转化过程中灰涂层床材料颗粒催化活性的理解。此外，它补充了有关催化床材料的现有文献，这些文献迄今为止侧重于焦油去除和改善气体质量。