Catalytic Oxidation of Oleic Acid in Supercritical Carbon Dioxide Media with Molecular Oxygen
Catalytic Oxidation of Oleic Acid in Supercritical Carbon Dioxide Media with Molecular Oxygen
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DOI：
10.1007/s11244-009-9212-6
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发表时间：
2009-06-01
影响因子：
3.6
通讯作者：
Ikushima, Yutaka
中科院分区：
文献类型：
--
作者：
Dapurkar, Sudhir E.;Kawanami, Hajime;Ikushima, Yutaka
在超临界二氧化碳（scCO(2)）和分子氧介质中，采用多种含过渡金属的有序多孔催化剂对油酸进行了氧化。油酸在多孔催化剂上，即介孔分子筛（CrMCM-41、MnMCM-41、CoMCM-41）和微孔分子筛（CrAPO-5、CoMFI、MnMFI）上，用scCO(2)在353 K下反应8 h，完全分解为一羧酸和二羧酸。在所研究的不同催化剂中，含铬的微孔和介孔催化剂在scCO(2)存在下，与含钴或锰的类似物相比，偶氮酸和壬二酸的分布较高。催化剂中scCO(2)介质的存在增加了杜鹃花酸和天竺葵酸的分布。考察了CO2压力、反应温度和反应时间对油酸在CrMCM-41上氧化的影响。此外，值得注意的是，催化剂可以回收，催化活性的损失可以忽略不计。
Oxidation of oleic acid was performed over various ordered porous catalysts containing transition metal in supercritical carbon dioxide (scCO(2)) media with molecular oxygen. Oleic acid was completely decomposed into mono- and dicarboxylic acids over porous catalysts, viz., mesoporous molecular sieves (CrMCM-41, MnMCM-41, CoMCM-41) and microporous molecular sieves (CrAPO-5, CoMFI, MnMFI) using scCO(2) at 353 K for 8 h. Among the different catalysts studied, microporous and mesoporous catalysts containing chromium, in presence of scCO(2) showed high distribution of azelaic and pelargonic acids as compared to their analogs containing cobalt or manganese. The presence of scCO(2) medium with the catalysts increased the distribution of azelaic and pelargonic acids. The effect of CO2 pressure, reaction temperature and reaction time on oxidation of oleic acid over CrMCM-41 was also investigated. Additionally it is noticed that the catalyst can be recycled with negligible loss of catalytic activity.