Fajdek-Bieda Anna, Wróblewska Agnieszka, Miądlicki Piotr, Konstanciak Anna
Technical Department, Jacob of Paradies University, Chopina 52, 66-400 Gorzow Wielkopolski, 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.
Materials (Basel). 2022 Mar 26;15(7):2449. doi: 10.3390/ma15072449.
This article presents research related to the transformation of geraniol (GA), leading to the formation of products with very valuable properties. In the planned method, heterogeneous catalysts of natural origin in the form of alum and diatomite were used as catalysts. Initially, the process which we investigated was the process of isomerization of GA, but it turned out during the studies that GA is also transformed in other reactions. Before catalytic tests, these two minerals were subjected to detailed instrumental analyses using the following methods: XRD, SEM/EDX, XRF and FTIR, which allowed to obtain their full morphological characteristics. During the catalytic tests, the influence of such relevant parameters on the GA transformations was determined: temperature from 80 to 150 °C, catalyst content from 5 to 15% by weight and the reaction time from 15 min to 24 h. The tests presented in the article were carried out under atmospheric pressure (in air) as well as without the use of a solvent. The optimal conditions for the transformations of GA were determined on the basis of its conversion and selectivities of transformation to the main products in the form of: beta-pinene (BP), 6,11-dimethyl-2,6,10-dodecatriene-1-ol (DC) and thumbergol (TH). The above products were formed with the highest selectivity, respectively: 100 mol%, 50 mol% and 52 mol%. The results of the syntheses showed that for GA the best transformation results were obtained at the temperature of 80 °C (for both tested catalysts), with the catalyst content of 1 wt % (for both tested catalysts) and for the reaction time of 1 h (for diatomite)) and 3 h (for alum).
本文介绍了与香叶醇（GA）转化相关的研究，该转化过程会生成具有非常有价值特性的产物。在所规划的方法中，以明矾和硅藻土形式存在的天然来源非均相催化剂被用作催化剂。最初，我们研究的过程是GA的异构化过程，但在研究过程中发现GA也会在其他反应中发生转化。在进行催化测试之前，使用以下方法对这两种矿物质进行了详细的仪器分析：XRD、SEM/EDX、XRF和FTIR，从而获得了它们完整的形态特征。在催化测试过程中，确定了以下相关参数对GA转化的影响：温度为80至150℃、催化剂含量为5至15重量%以及反应时间为15分钟至24小时。本文中呈现的测试是在大气压（空气中）下进行的，并且未使用溶剂。基于GA的转化率以及向主要产物β-蒎烯（BP）、6,11-二甲基-2,6,10-十二碳三烯-1-醇（DC）和苏合香醇（TH）的转化选择性，确定了GA转化的最佳条件。上述产物分别以最高选择性形成：100摩尔%、50摩尔%和52摩尔%。合成结果表明，对于GA，在80℃（两种测试催化剂均如此）、催化剂含量为1重量%（两种测试催化剂均如此）以及反应时间为1小时（对于硅藻土）和3小时（对于明矾）的条件下获得了最佳转化结果。
