Journal
CARBOHYDRATE POLYMERS
Volume 191, Issue -, Pages 17-24Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.03.002
Keywords
Cellulose nanofibrils; Hydroboration; Copper; Catalysts support; Sponge
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Funding
- National Key R&D Program of China [2016YFC0802802]
- National Science Foundation of China [NSFC-21472018]
- Fundamental Research Funds for the Central Universities [17D110516]
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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-II to Cu-I reduction and complexation. The sponge featured high porosity (90.5%) and low density (29.4 mg/cm(3)) 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.
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