Improved Carbon Dioxide Reduction

  • ChemPubSoc Europe Logo
  • Author: Angewandte Chemie International Edition
  • Published Date: 07 March 2019
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Improved Carbon Dioxide Reduction

Carbon dioxide (CO2) is a harmful greenhouse gas. Chemists could help to find ways to reduce CO2 levels in the atmosphere. However, it costs a lot of energy to break the molecule's C=O bonds and convert CO2 back to one of its original energy-rich reduced forms.


Nature has developed several enzymes to convert CO2 efficiently on a huge scale. In the enzyme carbon monoxide dehydrogenase (CODH), for example, a nickel-iron-based catalytic active site (pictured left) reversibly reduces CO2 to carbon monoxide (CO). The enzyme features two amino acids that hold the CO2 molecule in place through hydrogen bonds while electrons and protons are being added.


Ally Aukauloo, CEA Saclay, Gif-sur-Yvette, France, and Université Paris Sud, Orsay, France, Zakaria Halime, Université Paris Sud, and colleagues have modified an iron porphyrin catalyst (pictured right) with urea groups to lock a metal-bound CO2 in place by multiple hydrogen bonds. The resulting structure resembles the hydrogen‐bond stabilization scheme of the CO2 adduct in CODH.


Using this approach, the capture of CO2 is enhanced and less energy is needed to convert it to CO. The catalyst selectively generates CO with high Faradaic efficiency. These results might be beneficial for the development of cost-effective molecular catalysts for CO2 reduction.


 

 

Article Views: 1635

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH