Alkaline earth metal‐based catalysts applied in the process of dichlorohydrin cyclization into epichlorohydrin were studied. A series of solid catalysts were prepared by the equivalent‐volume impregnation method using γ‐Al₂O₃ as a carrier, whereas nitrates and chlorides of the three alkaline earth metals (Mg, Ca, and Ba) were employed as precursors. Their catalytic performance was investigated and compared, taking into account the main factors influencing the catalytic efficiency, such as X‐ray diffraction (XRD), N₂ adsorption–desorption, energy dispersive spectrometry (EDS) coupled with TEM, and CO₂ temperature‐programmed desorption (CO₂‐TPD). The results have shown that the specific surface area and the number of active base sites are the main factors that are affecting the catalytic efficiency. Among the series of as‐prepared catalysts, 10BaO/γ‐Al₂O₃ had improved catalytic performance. Based on the obtained results for the characterization of catalysts, the increased catalytic activity could be mainly attributed to the increase in base strength resulting from BaO loading onto the surface of γ‐Al₂O₃. Under optimized conditions, 98.4% conversion of 1,3‐DCH and approximately 90% of ECH selectivity were achieved using 10BaO/γ‐Al₂O₃ with a reaction temperature of 270°C. During the reaction process, the catalytic activity of 10BaO/γ‐Al₂O₃ remained consistently high, and its catalytic stability was excellent.

中文翻译：

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以γ-Al2O3为载体，由1,3-二氯醇与固体催化剂合成环氧氯丙烷

研究了在二氯醇环化为表氯醇过程中应用的碱土金属催化剂。一系列固体催化剂通过使用γ-Al系的等效体积浸渍法制备₂ ö ₃作为载体，而三个碱土金属（镁，钙，和Ba）的硝酸盐和氯化物被用作前体。考虑到影响催化效率的主要因素，对它们的催化性能进行了研究和比较，例如X射线衍射（XRD），N ₂吸附-解吸，能谱仪（EDS）和TEM以及CO ₂温度-程序解吸（CO ₂-TPD）。结果表明，比表面积和活性碱位的数目是影响催化效率的主要因素。间的系列所制备的催化剂，10BaO /γ-Al系的₂ ö ₃具有改善的催化性能。基于所获得的对催化剂的表征结果，增加的催化活性可主要归因于选自BaO装载所得到γ-Al的表面的增加碱强度₂ ö ₃。在优化条件下，98.4％的1,3--DCH的转化率和选择性ECH的约90％用10BaO /γ-Al系均达到₂ ö ₃反应温度为270°C。在反应过程中，10BaO的/γ-Al系的催化活性₂ ö ₃一直很高，并且其催化稳定性良好。