Aqueous phase reforming was studied for the valorization to hydrogen of the aqueous fraction of bio-oil from lignocellulosic biomass pyrolysis. Aqueous phase reforming was carried out at 220 °C with a 3 % wt. Pt/carbon catalyst and an aqueous fraction of bio-oil feed containing 1 % wt. of organic matter. Binary and multicomponent mixtures representing aqueous fractions of bio-oil were studied. Strong hydrogen production dependence on aqueous fraction of bio-oil composition was evidenced. Higher processability was obtained for aqueous fractions of bio-oil rich in levoglucosan and hydroxyacetone, reaching a hydrogen production close to 40 mmol per gram of organic carbon, whereas furfural and acetic acid hampered reforming. A significant influence of minority components such as methanol and, particularly, formic acid, was observed. These components improved reforming of the whole multicomponent mixture, showing that blending with biorefinery fractions rich in them can improve the applicability of aqueous phase reforming. The catalyst exhibited stable activity and hydrogen production after 5 reaction cycles and more than 20 h. An increase in selectivity was observed during cycles 2 and 3, which was studied by characterization of fresh and used catalysts to show structure-selectivity relationships. No significant variation of Pt²⁺/Pt⁰ and metal particle mean diameter were observed, but Pt nanoparticles underwent morphological changes leading to higher prevalence of low coordination sites, in particular step-edge sites on the particle surface, resulting in higher hydrogen production. Temperature programmed desorption and oxidation analysis showed a cumulative deposition of reaction byproducts on the catalyst surface that contributed to loss of activity.

研究了水相重整，以将木质纤维素生物质热解产生的生物油的水相部分转化为氢气。水相重整在 220°C 下用 3% wt 进行。Pt/碳催化剂和含有 1% wt 的生物油原料的水相馏分。的有机物。研究了代表生物油水性部分的二元和多组分混合物。证明了氢气生产对生物油组合物的水相部分的强烈依赖性。富含左旋葡聚糖和羟基丙酮的生物油水性馏分获得了更高的加工性能，每克有机碳的产氢量接近 40 mmol，而糠醛和乙酸阻碍了重整。观察到少数成分（例如甲醇，特别是甲酸）的显着影响。这些组分改善了整个多组分混合物的重整，表明与富含它们的生物精炼馏分混合可以提高水相重整的适用性。经过5次反应循环和20小时以上，催化剂表现出稳定的活性和产氢能力。在第 2 次和第 3 次循环期间观察到选择性增加，这是通过新鲜和用过的催化剂的表征来研究的，以显示结构-选择性关系。没有观察到Pt ²⁺ /Pt ⁰和金属颗粒平均直径的显着变化，但Pt纳米颗粒经历了形态变化，导致低配位位点的普遍存在，特别是颗粒表面的阶梯边缘位点，从而导致更高的氢气产量。程序升温解吸和氧化分析显示，反应副产物在催化剂表面累积沉积，导致活性损失。