Abstract A novel biomass conversion pathway that integrates carbon capture and storage schemes has been investigated using hemicellulose as the biomass feedstock. The alkaline thermal treatment (ATT) produces high purity H2 from biomass mixed with hydroxide and it can be considered as a bio-energy with carbon capture and storage (BECCS) technology, since the carbon in biomass becomes solid carbonates during the ATT reaction. In this study, in the presence of Ni catalyst, Group 1 and 2 hydroxides are employed to produce as high as 60 mmol H2 (96.8% purity) from 1 gram of hemicellulose (xylan) feedstock with in-situ carbon capture at mild conditions (i.e., atmospheric pressure and relatively low temperatures ≤773 K). Reaction pathways of hydrogen production in the ATT of hemicellulose are proposed via the investigation of the roles of each hydroxide and catalyst in the H2 formation from hemicellulose. Along with the previous studies on glucose and cellulose, this research lays a foundation for future development of H2 production from real biomass with carbon-neutral or possibly negative potential.

中文翻译：

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木聚糖原位碳捕集制高纯氢气催化碱性热处理的动力学和机理研究

摘要 使用半纤维素作为生物质原料，研究了一种将碳捕获和储存方案相结合的新型生物质转化途径。碱性热处理 (ATT) 从与氢氧化物混合的生物质中产生高纯度的 H2，它可以被视为具有碳捕获和储存 (BECCS) 技术的生物能源，因为生物质中的碳在 ATT 反应过程中变成固体碳酸盐。在这项研究中，在 Ni 催化剂的存在下，使用第 1 族和第 2 族氢氧化物从 1 克半纤维素（木聚糖）原料中生产高达 60 mmol H2（纯度为 96.8%），并在温和条件下进行原位碳捕获（即大气压和相对较低的温度≤773 K）。通过研究每种氢氧化物和催化剂在半纤维素形成 H2 中的作用，提出了半纤维素 ATT 中制氢的反应途径。连同之前对葡萄糖和纤维素的研究，这项研究为未来从具有碳中性或可能负潜力的真实生物质中生产 H2 的发展奠定了基础。