Key Lab of Science and Technology of Eco-Textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China.
Carbohydr Polym. 2018 Jul 1;191:17-24. doi: 10.1016/j.carbpol.2018.03.002. Epub 2018 Mar 2.
It is desirable for catalyst supports to be biodegradable, easily-modifiable, and possessing high surface area. In this work, thiolated nanocellulose sponge was prepared from hydrolytic silane condensation of cellulose nanofibrils (CNF) and used as a green support to immobilize copper cations via in situ Cu to Cu reduction and complexation. The sponge featured high porosity (90.5%) and low density (29.4 mg/cm) with regular morphology. The sponge easily recovered 94% of its original shape in water after experiencing 80% deformation under stress of 95 kPa. When used in catalyzing hydroboration of alkynes, excellent conversion and up to 99% regioselectivity were achieved with the copper-loaded sponge. The sponge-supported catalysts worked well in the absence of additional ligands, had a broad substrate scope, and retained 93% of their activity after six catalytic cycles. This simple and scalable strategy offers an efficient route for immobilizing metal catalysts on porous supports.
理想的催化剂载体应具有生物降解性、易修饰性和高比表面积。在这项工作中，通过纤维素纳米纤维（CNF）的水解硅烷缩合制备了巯基化纳米纤维素海绵，并将其用作绿色载体，通过原位 Cu 到 Cu 的还原和络合来固定铜离子。该海绵具有高孔隙率（90.5%）和低密度（29.4mg/cm），形态规则。该海绵在 95kPa 的压力下经历 80%的变形后，能在水中轻松恢复 94%的原始形状。当用于催化炔烃的硼氢化反应时，负载铜的海绵可实现优异的转化率和高达 99%的区域选择性。该海绵负载的催化剂在没有额外配体的情况下效果良好，具有广泛的底物范围，并且在经过六次催化循环后保留了 93%的活性。这种简单且可扩展的策略为在多孔载体上固定金属催化剂提供了一种有效的途径。
