Arian Mahdi, Mollabagher Hoda, Taheri Salman, Zamanian Ali, Mousavi Seyed Amir Hossein Seyed
Biomaterials Research Group, Nanotechnology and Advanced Materials Department, Materials and Energy Research Center (MERC), Tehran, Iran.
Chemistry and Chemical Engineering Research Center of Iran (CCERCI), Tehran, Iran.
Turk J Chem. 2021 Aug 16;45(6):1882-1894. doi: 10.3906/kim-2101-26. eCollection 2021.
Hydrophilic nano MnO is shown to have significant stability in aqueous media for oxidation of styrene. Different catalysts have been used to synthesis styrene oxide, but MnO-CaL is considered the efficient and selective catalyst to produce styrene oxide. In general, this paper reported especial strategy for synthesis of novel nano MnO that stabilized with oleic acid in chloroform and changing nature of its stabilizer by exchanging oleic acid with lignosulfunate and displays its catalytic activity towards selective oxidation of styrene. The catalyst has shown good selectivity in oxidation of styrene by changing temperature. Finding the optimal conditions for reaction and determining the best time and temperature for achieving the ideal product and reducing the side products are among the issues discussed in this article. MnO-CaLs leads to selective oxidation of styrene to styrene epoxide at low temperature. By increasing the temperatures, benzaldehyde and partially 2-phenyl acetaldehyde are also produced as by-products. Furthermore, the nano catalyst could be recycled several times without any clear changing in activity, which makes nano catalyst economic and environmentally friendly.
亲水性纳米MnO在水性介质中对苯乙烯氧化具有显著稳定性。已使用不同催化剂合成环氧苯乙烷，但MnO-CaL被认为是生产环氧苯乙烷的高效且选择性的催化剂。总体而言，本文报道了一种特殊策略，用于合成在氯仿中用油酸稳定的新型纳米MnO，并通过用木质素磺酸盐交换油酸来改变其稳定剂的性质，以及展示其对苯乙烯选择性氧化的催化活性。该催化剂通过改变温度在苯乙烯氧化反应中显示出良好的选择性。寻找反应的最佳条件以及确定获得理想产物并减少副产物的最佳时间和温度是本文讨论的问题之一。MnO-CaL能在低温下将苯乙烯选择性氧化为环氧苯乙烷。随着温度升高，还会产生副产物苯甲醛和部分2-苯基乙醛。此外，该纳米催化剂可以循环使用多次，活性没有明显变化，这使得纳米催化剂既经济又环保。
