Bio-green hydrogen is an emerging and innovative biofuel that is gaining traction across various energy sectors as a sustainable alternative to fossil fuels. It represents a critical step toward achieving resilience, economic benefits, carbon neutrality, and exceptional sustainability. Despite its potential, hydrogen recovery is often hindered by the dense biomass feedstock. This research aims to significantly enhance the production of bio-green hydrogen by leveraging cerium oxide (CeO2) in combination with aquatic lettuce (Pistia stratiotes) through a hydrothermal gasification process conducted at temperatures between 500 and 800 °C for 60 min. The present investigation focuses on the impact of varying concentrations of CeO2 nanoparticles (0.1, 0.2, 0.3, and 0.4 % by volume) on the specific growth rate of Pistia stratiotes over time. The results compellingly demonstrate that higher CeO2 concentrations facilitate impressive growth, averaging 0.88 μ per day. The biomass enriched with the highest concentration of CeO2 nanoparticles undergoes a hydrothermal gasification process using a potassium hydroxide (KOH) catalyst. This catalyst effectively promotes gasification, mitigates carbon deposition, boosts hydrogen production, and minimizes biochar formation. Notably, these findings underscore the significance of operating at an optimal gasification temperature of 800 °C for 60 min, resulting in a remarkable hydrogen molar fraction of 61 %, a maximum hydrogen yield of 28.1 mol/kg, and a reduced low heating value of 8.9 MJ/Nm³. Furthermore, the process achieves an impressive hydrogen selectivity of 21.2 and an outstanding gasification efficiency of 68 %. These results illustrate the potential of bio-green hydrogen as a transformative energy source, paving the way for a more sustainable future.

中文翻译：

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氧化铈活化水生莴苣作为水热气化制氢的来源：性能措施


生物绿色氢气是一种新兴的创新生物燃料，作为化石燃料的可持续替代品，它在各个能源领域越来越受欢迎。它代表了朝着实现弹性、经济效益、碳中和卓越的可持续性迈出的关键一步。尽管氢具有潜力，但氢回收经常受到致密生物质原料的阻碍。本研究旨在通过在 500 至 800 °C 的温度下进行 60 分钟的水热气化过程，利用氧化铈 （CeO2） 和水生莴苣 （Pistia stratiotes） 来显着提高生物绿色氢的生产。本研究的重点是不同浓度的 CeO2 纳米颗粒（体积百分比为 0.1、0.2、0.3 和 0.4%）对 Pistia 层状物比生长速率随时间的影响。结果令人信服地表明，较高的 CeO2 浓度促进了令人印象深刻的生长，平均每天 0.88 μ。富含最高浓度 CeO2 纳米颗粒的生物质使用氢氧化钾 （KOH） 催化剂进行水热气化过程。这种催化剂可有效促进气化，减少积碳，促进氢气产生，并最大限度地减少生物炭的形成。值得注意的是，这些发现强调了在 800 °C 的最佳气化温度下运行 60 分钟的重要性，从而产生 61 % 的显着氢摩尔分数，最大氢气产率为 28.1 mol/kg，低热值降低至 8.9 MJ/Nm³。此外，该工艺实现了令人印象深刻的 21.2 氢气选择性和 68% 的出色气化效率。 这些结果表明，生物绿色氢能作为一种变革性能源的潜力，为更可持续的未来铺平了道路。