A new type of heterogeneous catalyst for hydration of α-pinene was prepared. Montmorillonite K10 was treated by various acids (H2SO4, HCl, HNO3, and ClCH2COOH) and successfully used for the mentioned reaction. The used characterization techniques showed that the acid treatment improved the properties of K10 important for the catalytic activity (SBET and acidity). On the other hand, the morphology and particle size distribution remained the same. Regarding the selectivity (side and consecutive reactions can proceed), the optimal reaction conditions were found (temperature, type of the catalyst, amount of the catalyst, molar ratio α-pinene: water, type of water, solvent). Using the optimal reaction conditions, 60% conversion of α-pinene was achieved with 45% selectivity to α-terpineol (80 °C, 25 wt% of K10/HCl, or K10/H2SO4, nα-pinene:nwater 1:7.5, 1,4-dioxane as a solvent, 24 h). Higher conversions of α-pinene, as well as higher selectivity to α-terpineol, were achieved using all acid treated K10 in comparison to raw K10. Considering the heterogeneous form of prepared catalysts, its availability, low price and easy method of preparation, these catalysts dispose of a large potential for application as catalysts for hydration reactions.

中文翻译：

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酸处理蒙脱石K10催化生物质资源制备α-松油醇

制备了一种新型的α-蒎烯水合多相催化剂。蒙脱石 K10 用各种酸（H2SO4、HCl、HNO3 和 ClCH2COOH）处理并成功用于上述反应。所使用的表征技术表明，酸处理改善了 K10 对催化活性（SBET 和酸度）很重要的特性。另一方面，形态和粒度分布保持不变。关于选择性（可以进行副反应和连续反应），找到了最佳反应条件（温度，催化剂类型，催化剂量，α-蒎烯：水摩尔比，水类型，溶剂）。使用最佳反应条件，α-蒎烯的转化率为 60%，生成 α-松油醇的选择性为 45%（80 °C，25 wt% 的 K10/HCl 或 K10/H2SO4，nα-蒎烯:nwater 1:7.5，1,4-二恶烷作为溶剂，24 小时）。与未加工的 K10 相比，使用所有酸处理的 K10 实现了更高的 α-蒎烯转化率以及更高的 α-萜品醇选择性。考虑到所制备催化剂的多相形式、其可用性、低价格和易于制备的方法，这些催化剂作为水合反应催化剂具有很大的应用潜力。