Alkali-thermal gasification and hydrogen generation potential of biomass
Alkali-thermal gasification and hydrogen generation potential of biomass
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DOI：
10.1007/s11705-017-1662-y
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发表时间：
2017-08
影响因子：
4.5
通讯作者：
A. Koven;S. Tong;R. Farnood;C. Jia
中科院分区：
文献类型：
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作者：
A. Koven;S. Tong;R. Farnood;C. Jia
从生物质中产生氢气是降低能源和化学原料对化石燃料的依赖以及减少温室气体排放的一种方法。使用NaOH作为模型碱的平衡模拟和分批实验，该研究建立了转化各种生物质（例如，在中等温度（低至300 °C）下，通过无催化剂的碱热气化，将葡萄糖、纤维素、木聚糖和木质素）转化为富含H2的气体。与其他类似的方法相比，该方法可以产生更多的H2，而产物中的含碳气体更少。结果表明，碱热气化反应遵循CxHyOz+ 2xNaOH +（x-z）H2O =（2x+y/2-z）H2+ xNa 2CO 3，固体产物为碳酸盐。此外，还引入了生物质产氢潜力（H2-GP）的概念。对于给定的生物质CxHyOz，H2-GP将是（2x+y/2-z）摩尔的H2。实验证明，通过调节H_2O和NaOH的量、温度和压力，可以实现H_2-GP。
Generating hydrogen gas from biomass is one approach to lowering dependencies on fossil fuels for energy and chemical feedstock, as well as reducing greenhouse gas emissions. Using both equilibrium simulations and batch experiments with NaOH as a model alkaline, this study established the technical feasibility of converting various biomasses (e.g., glucose, cellulose, xylan and lignin) into H2-rich gas via catalyst-free, alkalithermal gasification at moderate temperatures (as low as 300 °C). This process could produce more H2with less carbon-containing gases in the product than other comparable methods. It was shown that alkali-thermal gasification follows CxHyOz+ 2xNaOH + (x–z)H2O = (2x+y/2–z)H2+xNa2CO3, with carbonate being the solid product which is different from the one suggested in the literature. Moreover, the concept of hydrogen generation potential (H2-GP)—the maximum amount of H2that a biomass can yield, was introduced. For a given biomass CxHyOz, the H2-GP would be (2x+y/2–z) moles of H2. It was demonstrated experimentally that the H2-GP was achievable by adjusting the amounts of H2O and NaOH, temperature and pressure.