Abstract A series of Ni/CeO2 catalysts were synthesized via a simple one-pot hydrothermal method and characterized by XRD, SEM, TEM, EDX, EDX mapping, Raman, H2-TPR, BET, XPS, TGA and ICP-MS. Their catalytic performances were systematically evaluated in hydroliquefaction of rice straw. The impact of reaction temperature, reaction time, H2 pressure and Ni/Ce molar ratios on product yields and distribution was also investigated. The conversion (89.08%) of rice straw and bio-oil yield (66.7%) obtained over Ni/CeO2 catalyst with a Ni/Ce molar ratio of 2/10 are superior to those over no catalyst (conversion of 73.65%, bio-oil yield of 47.96%) and pure CeO2 catalyst (conversion of 77.79%, bio-oil yield of 56.67%) under the optimum condition (290 °C, 1.0 h, and 2.0 MPa H2 pressure). GC–MS results show that the main components of bio-oil are phenols, which are high-value-added, important and useful chemicals in transportation and chemical industries. It is worth noting that the highly dispersed Ni nanoparticles and their stronger interaction between Ni and CeO2 with more oxygen vacancies facilitate high conversion of rice straw and bio-oil yield. In addition, a possible catalytic mechanism of Ni/CeO2 catalyst for hydrogenation of rice straw is accordingly proposed. This work thus offers an effective approach to improve the conversion of rice straw and bio-oil yield over Ni/CeO2 catalysts.

中文翻译：

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Ni/CeO 2 催化剂催化稻草加氢液化生产生物油

摘要 采用简单的一锅水热法合成了一系列Ni/CeO2催化剂，并采用XRD、SEM、TEM、EDX、EDX mapping、Raman、H2-TPR、BET、XPS、TGA和ICP-MS等手段对其进行了表征。系统评价了它们在稻草加氢液化中的催化性能。还研究了反应温度、反应时间、H2 压力和 Ni/Ce 摩尔比对产物产率和分布的影响。在 Ni/Ce 摩尔比为 2/10 的 Ni/CeO2 催化剂上获得的稻草转化率（89.08%）和生物油收率（66.7%）优于没有催化剂（转化率为 73.65%，生物油）。油产率 47.96%）和纯 CeO2 催化剂（转化率 77.79%，生物油产率 56.67%）在最佳条件下（290 °C、1.0 h 和 2.0 MPa H2 压力）。GC-MS 结果表明生物油的主要成分是酚类，是交通运输和化工行业中高附加值、重要、有用的化学品。值得注意的是，高度分散的 Ni 纳米粒子及其与 Ni 和 CeO2 之间更强的相互作用以及更多的氧空位促进了稻草的高转化率和生物油产量。此外，相应地提出了Ni/CeO2催化剂对稻草加氢的可能催化机理。因此，这项工作提供了一种有效的方法来提高 Ni/CeO2 催化剂上稻草的转化率和生物油产量。据此提出了Ni/CeO2催化剂对稻草加氢的可能催化机理。因此，这项工作提供了一种有效的方法来提高 Ni/CeO2 催化剂上稻草的转化率和生物油产量。据此提出了Ni/CeO2催化剂对稻草加氢的可能催化机理。因此，这项工作提供了一种有效的方法来提高 Ni/CeO2 催化剂上稻草的转化率和生物油产量。