Add like
Add dislike
Add to saved papers

Synergetic Catalysis of Copper and Iron in Oxidation of Reduced Keggin Heteropolytungstates by Dioxygen.

Inorganic Chemistry 2018 January 3
Polyoxometalates (POMs) and in particularly Keggin heteropolytungstates are much studied and commercially important catalysts for dioxygen-based oxidation processes. The rate-limiting step in many POM-catalyzed O2 -based oxidations is reoxidation of the reduced POM by O2 . We report here that this reoxidation process, as represented by the one-electron-reduced Keggin complexes POMred (α-PW12 O40 4- and α-SiVW11 O40 6- ) reacting with O2 , is efficiently catalyzed by a combination of copper and iron complexes. The reaction kinetics and mechanism have been comprehensively studied in sulfate and phosphate buffer at pH 1.8. The catalytic pathway includes a reversible reaction between Cu(II) and Fe(II), followed by a fast oxidation of POMred by Fe(III) and Cu(I) by O2 to regenerate Fe(II) and Cu(II). The proposed reaction mechanism quantitatively describes the experimental kinetic curves over a wide range of experimental conditions. Since the oxidized forms, α-PW12 O40 3- and α-SiVW11 O40 5- , are far better oxidants of organic substrates than the previously studied POMs, α-SiW12 O40 4- and α-AlW12 O40 5- , this synergistic Fe/Cu cocatalysis of reduced-POM reoxidation could well facilitate significant new O2 /air-based processes.

Full text links

We have located links that may give you full text access.
Can't access the paper?
Try logging in through your university/institutional subscription. For a smoother one-click institutional access experience, please use our mobile app.

For the best experience, use the Read mobile app

Mobile app image

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app

All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.

By using this service, you agree to our terms of use and privacy policy.

Your Privacy Choices Toggle icon

You can now claim free CME credits for this literature searchClaim now

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app