Activation and splitting of carbon dioxide on the surface of an inorganic electride material

Yoshitake Toda, Hiroyuki Hirayama, Navaratnarajah Kuganathan, Antonio Torrisi, Peter V. Sushko and Hideo Hosono ()
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Yoshitake Toda: Frontier Research Center, Tokyo Institute of Technology
Hiroyuki Hirayama: Tokyo Institute of Technology
Navaratnarajah Kuganathan: University College London
Antonio Torrisi: University College London
Peter V. Sushko: University College London
Hideo Hosono: Frontier Research Center, Tokyo Institute of Technology

Nature Communications, 2013, vol. 4, issue 1, 1-8

Abstract: Abstract Activation of carbon dioxide is the most important step in its conversion into valuable chemicals. Surfaces of stable oxide with a low work function may be promising for this purpose. Here we report that the surfaces of the inorganic electride [Ca24Al28O64]4+(e−)4 activate and split carbon dioxide at room temperature. This behaviour is attributed to a high concentration of localized electrons in the near-surface region and a corrugation of the surface that can trap oxygen atoms and strained carbon monoxide and carbon dioxide molecules. The [Ca24Al28O64]4+(e−)4 surface exposed to carbon dioxide is studied using temperature-programmed desorption, and spectroscopic methods. The results of these measurements, corroborated with ab initio simulations, show that both carbon monoxide and carbon dioxide adsorb on the [Ca24Al28O64]4+(e−)4 surface at RT and above and adopt unusual configurations that result in desorption of molecular carbon monoxide and atomic oxygen upon heating.

Date: 2013
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DOI: 10.1038/ncomms3378

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