Baran Talat, Sargin Idris, Kaya Murat, Menteş Ayfer, Ceter Talip
Department of Chemistry, Faculty of Science and Letters, Aksaray University, 68100 Aksaray, Turkey.
Department of Biotechnology and Molecular Biology, Faculty of Science and Letters, Aksaray University, 68100 Aksaray, Turkey.
J Colloid Interface Sci. 2017 Jan 15;486:194-203. doi: 10.1016/j.jcis.2016.09.071. Epub 2016 Sep 28.
Bio-based catalyst support materials with high thermal and structural stability are desired for catalysts systems requiring harsh conditions. In this study, a thermally stable palladium catalyst (up to 440°C) was designed from sporopollenin, which occurs naturally in the outer exine layer of pollens and is widely acknowledged as chemically very stable and inert biological material. Catalyst design procedure included (1) extraction of sporopollenin microcapsules from Betula pendula pollens (∼25μm), (2) amino-functionalisation of the microcapsules, (3) Schiff base modification and (4) preparation of Pd(II) catalyst. The catalytic activity of the sporopollenin microcapsule supported palladium catalyst was tested in catalysis of biaryls by following a fast, simple and green microwave-assisted method. We recorded outstanding turnover number (TON: 40,000) and frequency (TOF: 400,000) for the catalyst in Suzuki coupling reactions. The catalyst proved to be reusable at least in eight cycles. The catalyst can be suggested for different catalyst systems due to its thermal and structural durability, reusability, inertness to air and its eco-friendly nature.
对于需要苛刻条件的催化剂体系而言，具有高热稳定性和结构稳定性的生物基催化剂载体材料是很有必要的。在本研究中，一种热稳定的钯催化剂（最高可达440°C）是由孢粉素设计而成的，孢粉素天然存在于花粉的外壁层，被广泛认为是化学性质非常稳定且惰性的生物材料。催化剂的设计过程包括：（1）从垂枝桦花粉（约25μm）中提取孢粉素微胶囊；（2）对微胶囊进行氨基官能化；（3）席夫碱修饰；（4）制备Pd(II)催化剂。通过一种快速、简单且绿色的微波辅助方法，测试了孢粉素微胶囊负载钯催化剂在联芳基催化反应中的催化活性。我们记录到该催化剂在铃木耦合反应中的出色周转数（TON：40,000）和频率（TOF：400,000）。该催化剂被证明至少可重复使用八次。由于其热稳定性、结构耐久性、可重复使用性、对空气的惰性以及生态友好性，该催化剂可用于不同的催化剂体系。
