Catalytic epoxidation of tall oil, a Scandinavian raw material originating from the Kraft pulping process, was studied in this work. Conversely from the industrial process, the reaction was carried out via the hydroperoxide pathway, where the epoxidation of the double bonds takes place by hydrogen peroxide without the need for a reaction carrier. Metal oxide-modified SBA-15 catalysts were screened in the experiments performed in a laboratory-scale reactor where the operating conditions, such as the reaction temperature, the reaction time, and the reactant molar ratio, were kept constant. The main aim was to identify the best catalyst among those synthesized that would give promising results, in terms of activity and selectivity, in the epoxidation reaction. For this purpose, the relationship between the physicochemical properties of the selected catalysts and the obtained performances in the reaction system were studied in depth. Characterization analysis showed that almost all of the catalysts exhibited an organized mesoporous structure typical of SBA-15 without any morphological deformation after the metal introduction, which is present for all of them as oxide. Good activity was shown by most of the catalysts, with almost complete double bond conversion after 24 h reaction. However, selectivity to the target product was not as remarkable as the actvity. Among the tested catalysts, promising results were obtained in the presence of Mn-SBA-15 with a conversion and selectivity of 25 and 23% after 8 h of reaction, respectively.

中文翻译：

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非贵金属氧化物改性非均相催化剂存在下的妥尔油环氧化


这项工作研究了妥尔油的催化环氧化，妥尔油是一种源自牛皮纸制浆工艺的斯堪的纳维亚原材料。与工业过程相反，反应是通过氢过氧化物途径进行的，其中双键的环氧化由过氧化氢发生，无需反应载体。在实验室规模的反应器中进行的实验中筛选了金属氧化物改性的 SBA-15 催化剂，其中反应温度、反应时间和反应物摩尔比等操作条件保持不变。主要目的是在合成的催化剂中确定在环氧化反应中能产生有希望的结果的最佳催化剂。为此，深入研究了所选催化剂的物理化学性质与反应体系中获得的性能之间的关系。表征分析表明，几乎所有催化剂都表现出 SBA-15 典型的有组织的介孔结构，在金属引入后没有任何形态变形，而金属则以氧化物的形式存在。大多数催化剂表现出良好的活性，反应 24 小时后几乎完全发生双键转化。然而，对目标产物的选择性不如活性显著。在测试的催化剂中，在 Mn-SBA-15 存在下获得了有希望的结果，反应 8 小时后转化率和选择性分别为 25% 和 23%。