Fast CO2 Capture at a Wide Range of Temperatures

  • Author: ChemistryViews.org
  • Published: 12 July 2018
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Nano Letters/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Fast CO<sub>2</sub> Capture at a Wide Range of Temperatures

Carbon dioxide is a greenhouse gas and a major cause of global warming. Capturing CO2 from flue gas after fossil fuel combustion is one approach to prevent its atmospheric concentration from rising. However, solid CO2 sorbents for such applications need to perform well at a wide range of temperatures, which makes their design challenging.


Jian Ru Gong, Chinese Academy of Sciences (CAS) Center for Excellence in Nanoscience and University of the Chinese Academy of Sciences, Beijing, Mahendra Sunkara, University of Louisville, KY, USA, and colleagues have synthesized lithium hexaoxotungstate (Li6WO6) nanowires as CO2 sorbents. The team used a solid-state reaction between lithium hydroxide and tungsten oxide to prepare the nanowires. They coated a quartz slide with the reaction mixture and subjected the sample to thermal oxidation at 700 °C for 3 h.


The resulting nanowires adsorb CO2 fast and efficiently at both low and high temperatures. At under dry conditions at 710 °C, the nanowires capture CO2  with a capacity of 12 % of their own weight in only 60 s. At 30−40 °C and in the presence of water vapor, the nanowires take up 7.6 % of their own weight in CO2 in the same time. According to the researchers, the synthesized material can chemisorb CO2 in the absence of water at high temperatures, but water vapor is needed to trap CO2 at lower temperatures. This can be attributed to a hydroxylation of the nanowire surface, which makes the CO2 capture thermodynamically more favorable. The nanowire material can be recycled by CO2 desorption and reused.


 

Article Views: 1386

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