ADVERTISEMENT
2 /3 FREE ARTICLES LEFT THIS MONTH Remaining
Chemistry matters. Join us to get the news you need.

If you have an ACS member number, please enter it here so we can link this account to your membership. (optional)

ACS values your privacy. By submitting your information, you are gaining access to C&EN and subscribing to our weekly newsletter. We use the information you provide to make your reading experience better, and we will never sell your data to third party members.

ENJOY UNLIMITED ACCES TO C&EN

Materials

Superhydrophobic packaging protects water-sensitive catalysts

Strategy calls for incorporating catalyst metals within porous water-repellent polymers

by Mitch Jacoby
October 24, 2016 | APPEARED IN VOLUME 94, ISSUE 42

Water-sensitive, solution-phase catalysts can be protected from unwanted hydrolysis by anchoring them inside highly hydrophobic porous organic polymers, according to a study (Chem 2016, DOI: 10.1016/j.chempr.2016.09.008). Enveloping the catalytic sites in a water-excluding polymeric framework can extend catalyst lifetime as well as broaden the range of reactions for which they can be used. Shengqian Ma of the University of South Florida and coworkers demonstrated the strategy by synthesizing rhodium-infused phosphite-based materials and testing how well they catalyze conversion of olefins to aldehydes, a commercially important reaction. Rhodium phosphite catalysts generally are very active but are prone to decomposition via hydrolysis of P–O bonds. To make a superhydrophobic version of the phosphite-based material, the team prepared a substituted triphenyl phosphite monomer and polymerized it. The researchers treated the water-repellent porous polymer with a rhodium precatalyst, resulting in the rhodium binding to the phosphite sites within the material. Catalysis tests showed that the superhydrophobic material was highly active, even in the presence of water, retaining its activity throughout 14 runs over a weeklong period. In contrast, the activity of traditional heterogeneous and homogeneous rhodium catalysts tested began falling after just a few runs.

Credit: Chem
A water droplet spreads on a pellet of a phosphite-based monomer, but not on the corresponding superhydrophobic polymer nor on a catalytically active metallized version of the polymer.
X

Article:

This article has been sent to the following recipient:

Leave A Comment

*Required to comment