Abstract Lignin is an important sustainable feedstock for producing valuable aromatics, which can be achieved by catalytic hydrogenolysis over suitable heterogeneous catalysts. Herein, Ni/TiN catalysts with different Ni loadings (5%–30%) were prepared by an incipient-wetness impregnation method. The effects of Ni loadings, reaction temperature, H2 pressure, and time on hydrogenolysis of benzyloxybenzene (BOB) were investigated. The results showed that Ni/TiN presented high active for selective hydrogenolysis of C O bond in BOB to produce aromatics. The BOB conversion reached up to 100% with high selectivity of toluene (64%) and phenol (60%) over Ni10%/TiN under the optimal reaction conditions (250 °C, 1 MPa H2, and 3 h). Ni10%/TiN showed good stability and reusability with slight decrease in BOB conversion and selectivity of toluene and phenol after five runs. The morphological characteristics of the reused Ni10%/TiN remained almost unchanged. Additionally, Ni10%/TiN showed good catalytic activity in cleaving C O bridged bonds in dealkaline lignin to produce aromatics with high selectivity. Phenols are the major aromatics with the highest relative content of 60.6% obtained at 300 °C under catalytic conditions, among which guaiacols are predominant. Possible mechanisms for hydrogenolysis of BOB and dealkaline lignin were discussed according to the product distributions.

中文翻译：

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在 Ni/TiN 上选择性氢解苄氧基苯和脱碱木质素中的 CO 键生成有价值的芳烃

摘要 木质素是一种重要的可持续生产有价值的芳烃的原料，可以通过合适的多相催化剂催化氢解来实现。在此，通过初湿浸渍法制备了具有不同 Ni 负载量（5%–30%）的 Ni/TiN 催化剂。研究了 Ni 负载量、反应温度、H2 压力和时间对苄氧基苯 (BOB) 氢解的影响。结果表明，Ni/TiN 对 BOB 中 CO 键的选择性氢解产生芳烃具有高活性。在最佳反应条件（250 °C、1 MPa H2 和 3 h）下，BOB 转化率高达 100%，甲苯（64%）和苯酚（60%）选择性高于 Ni10%/TiN。Ni10%/TiN 表现出良好的稳定性和可重复使用性，5 次运行后 BOB 转化率和甲苯和苯酚的选择性略有下降。再利用的 Ni10%/TiN 的形态特征几乎保持不变。此外，Ni10%/TiN 在裂解脱碱木质素中的 CO 桥键以生产高选择性芳烃方面表现出良好的催化活性。酚类是主要的芳烃，在 300°C 催化条件下获得的相对含量最高，为 60.6%，其中愈创木酚是主要的。根据产物分布讨论了 BOB 和脱碱木质素氢解的可能机制。Ni10%/TiN 在裂解脱碱木质素中的 CO 桥键以生产高选择性芳烃方面表现出良好的催化活性。酚类是主要的芳烃，在 300°C 催化条件下获得的相对含量最高，为 60.6%，其中愈创木酚是主要的。根据产物分布讨论了 BOB 和脱碱木质素氢解的可能机制。Ni10%/TiN 在裂解脱碱木质素中的 CO 桥键以生产高选择性芳烃方面表现出良好的催化活性。酚类是主要的芳烃，在 300°C 催化条件下获得的相对含量最高，为 60.6%，其中愈创木酚是主要的。根据产物分布讨论了 BOB 和脱碱木质素氢解的可能机制。