Mild prehydrogenation of phenolics in bio-oil is known to effectively alleviate the severe coking that occurs on the surface of the cracking catalysts. This study investigated the hydrogenation of phenolic monomers (i.e., phenol, catechol, and guaiacol) over Pt–Ni/SiO₂ at different Ni/Pt ratios. The results show that the hydrogenation of aromatic rings preferentially occurred over the Pt–Ni/SiO₂ catalyst, with a slight hydrogenolysis of the C_aryl–OR bond. The prepared Pt–Ni/SiO₂ catalysts not only offered a good dispersion of the Pt and Ni species on SiO₂, but also promoted spontaneous dissociation of H₂ and facile diffusion of the resulting H atoms on Pt–Ni/SiO₂, thereby contributing to its remarkable catalytic performance. The optimized 3Pt6Ni/SiO₂ catalyst not only achieved a high phenolic conversion of 66%−99% and a high liquid product yield of 80%, but also significantly inhibited the side reaction of the products leading to gas formation. Furthermore, a stable phenolic conversion of ~80% within 24 h indicates the superior stability of 3Pt6Ni/SiO₂. Subsequently, catalytic cracking of the hydrotreated bio-oil was investigated. The results indicate that mild hydrogenation benefits the formation and aromatization of light olefin intermediates, leading to increased formation of monocyclic aromatic hydrocarbons. The oil phase yield of the bio-oil fraction was 38.6%, comprising entirely hydrocarbons, of which 82.2% were monocyclic aromatic hydrocarbons. Hence, this study provides a promising approach for converting the phenolics in bio-oil into highly hydrogenated products, which are ready for the subsequent catalytic cracking.

已知生物油中酚类化合物的轻度预氢化可有效缓解裂解催化剂表面严重的焦化。这项研究研究了在不同的Ni / Pt比下，Pt-Ni / SiO ₂上酚类单体（即苯酚，邻苯二酚和愈创木酚）的氢化反应。结果表明，芳环的氢化优先发生在Pt-Ni / SiO ₂催化剂上，C_芳基-OR键发生轻微的氢解。制备的Pt-Ni / SiO ₂催化剂不仅可以使Pt和Ni物种良好地分散在SiO _2上，而且还可以促进H _2的自发离解和所生成的H原子在Pt-Ni / SiO ₂上的容易扩散。从而有助于其出色的催化性能。优化的3Pt6Ni / SiO ₂催化剂不仅实现了66％-99％的高酚转化率和80％的高液体产物收率，而且还显着抑制了导致气体形成的副反应。此外，在24小时内〜80％的稳定酚转化率表明3Pt6Ni / SiO ₂的优异稳定性。随后，研究了加氢处理的生物油的催化裂化。结果表明，轻度加氢有利于轻烯烃中间体的形成和芳构化，从而导致单环芳烃的形成增加。生物油馏分的油相产率为38.6％，全部包含烃，其中82.2％为单环芳烃。因此，这项研究提供了一种将生物油中的酚类化合物转化为高度氢化产物的有前途的方法，这些产物可用于后续的催化裂化。