Grzeszczak Jadwiga, Wróblewska Agnieszka, Michalkiewicz Beata, Dzięcioł Małgorzata, Janda-Milczarek Katarzyna
Department of Medical Chemistry, Pomeranian Medical University, Powstańców Wlkp. 71 St., 70-111 Szczecin, Poland.
Department of Catalytic and Sorbent Materials Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Piastów Ave. 42, 71-065 Szczecin, Poland.
Molecules. 2025 Apr 5;30(7):1627. doi: 10.3390/molecules30071627.
α-Pinene is a very valuable natural raw material for organic syntheses, which is of increasing interest to scientists due to its renewability and relatively low price. This work presents the studies on the oxidation of α-pinene in the presence of two mesoporous titanium-silicate catalysts: standard Ti-SBA-15 and Ti-SBA-15 material, which was obtained by a new and green way using orange peel waste as bio-templates (Ti-SBA-15_orange peels). For the synthesis of the Ti-SBA-15 catalysts, the following raw materials were used: Pluronic P123 as the template (template usually used in the synthesis of SBA-15 materials), tetraethyl orthosilicate as the silicon source, hydrochloric acid, deionized water, and tetraisopropyl orthotitanate as the titanium source. For the synthesis of Ti-SBA-15_orange peels, a catalyst was also properly prepared, and orange peel waste as the co-templates (renewable templates) were used. The two obtained Ti-SBA-15 materials were characterized by the following instrumental methods: XRD, SEM, EDX, UV-Vis, and FTIR. Moreover, the specific surface area and pore size distribution were investigated for these catalysts with help from the nitrogen adsorption-desorption method. Catalytic tests of the obtained catalysts were performed in the oxidation of α-pinene with oxygen and by the method which did not use any solvent (α-pinene was simultaneously the raw material and solvent in this process). During the catalytic tests, the effect of temperature, catalyst content, and reaction time on the selectivities of the appropriate products and the conversion of α-pinene were studied. Depending on the conditions of the oxidation process, the catalyst obtained with the use of orange peels as co-templates showed similar or even higher activity than the standard Ti-SBA-15 catalyst.
α-蒎烯是有机合成中一种非常有价值的天然原料，由于其可再生性和相对较低的价格，受到科学家越来越多的关注。本文介绍了在两种介孔钛硅催化剂存在下对α-蒎烯氧化的研究：标准的Ti-SBA-15和通过一种新的绿色方法以橙皮废料作为生物模板获得的Ti-SBA-15材料（Ti-SBA-15_橙皮）。在Ti-SBA-15催化剂的合成中，使用了以下原料：作为模板的Pluronic P123（通常用于SBA-15材料合成的模板）、作为硅源的正硅酸乙酯、盐酸、去离子水以及作为钛源的钛酸四异丙酯。在Ti-SBA-15_橙皮的合成中，也制备了一种合适的催化剂，并使用橙皮废料作为共模板（可再生模板）。通过以下仪器方法对获得的两种Ti-SBA-15材料进行了表征：XRD、SEM、EDX、UV-Vis和FTIR。此外，借助氮气吸附-脱附法研究了这些催化剂的比表面积和孔径分布。对获得的催化剂进行了在氧气存在下氧化α-蒎烯的催化测试，且该方法不使用任何溶剂（在此过程中α-蒎烯同时作为原料和溶剂）。在催化测试过程中，研究了温度、催化剂含量和反应时间对相应产物选择性以及α-蒎烯转化率的影响。根据氧化过程的条件，以橙皮作为共模板获得的催化剂表现出与标准Ti-SBA-15催化剂相似甚至更高的活性。
