Synergic Actions of BEA-Type Zeolites and Ultrasonic Irradiation in Conversion of Geraniol
作者:Ts. Ramishvili、V. Tsitsishvili、I. Ivanova、N. Kokiashvili、T. Bukia、G. Kurtsikidze
DOI:10.14233/ajchem.2019.21670
日期:——
The geraniol conversion reaction was initiated by the simultaneous action of micro- and micro-mesoporous BEA-type zeolites and ultrasonic irradiation (UMR-300B hybrid reactor, 25 kHz, 100-900 W; SRF-1, 20-60 kHz, 100 W). Geraniol by ultrasonic irradiation at 27-100 ºC, had a low degree of conversion, upto 2 %. Geraniol was a resistant to ultrasound in argon atmosphere solutions of N,N-dimethylformamide and methanol. In methanolic solution, geraniol was actively converted to linalool and to methyl ethers of linalool and nerol with the selectivity of 80 % on zeolite BEA-25 under ultrasonic irradiation in air at 30 ºC. Using BEA-type zeolite/ultrasonic-assisted reaction was increased the degree of conversion of geraniol, the selectivity and yield to linalool and nerol on the most active RBEA-25 zeolite by prolonged ultrasonic irradiation (1.5-5 h) or under combined ultrasound and microwave irradiation (US 300 W/MW 550 W, 1.5 h, 80 ºC).
香芹醇的转化反应是通过微孔和微介孔BEA型沸石的同时作用以及超声辐射启动的(UMR-300B混合反应器,25 kHz,100-900 W;SRF-1,20-60 kHz,100 W)。在27-100 ºC的超声辐射下,香芹醇的转化程度较低,仅达到2%。在氩气氛围下的N,N-二甲基甲酰胺和甲醇溶液中,香芹醇对超声波具有较强的抗性。在甲醇溶液中,香芹醇被积极转化为香叶醇及其甲基醚和狄香醇,在30 ºC的空气中,使用BEA-25沸石的选择性达到80%。使用BEA型沸石/超声辅助反应可提高香芹醇的转化程度,以及在最活跃的RBEA-25沸石上对香叶醇和狄香醇的选择性和产率,经过延长的超声辐射(1.5-5小时)或在超声和微波辐射的组合下(US 300 W/MW 550 W,1.5小时,80 ºC)。