Adsorption and photocatalytic reduction of carbon dioxide on TiO2

Oleksandr Shtyka, Viktar Shatsila, Radoslaw Ciesielski, Adam Kedziora, Waldemar Maniukiewicz, Sergey Dubkov, Dmitry Gromov, Andrey Tarasov, Jacek Rogowski, Andrey Stadnichenko, Petr Lazarenko, Roman Ryazanov, Malgorzata I. Szynkowska-Jóźwik, Tomasz Maniecki

Research output: Contribution to journalArticlepeer-review

Abstract

The photocatalytic activity of TiO2 depends on numerous factors, such as the chemical potential of electrons, charge transport properties, band-gap energy, and concentration of surface-active sites. A lot of research has been dedicated to determining the properties that have the most significant influence on the photocatalytic activity of semiconductors. Here, we demonstrated that the activity of TiO2 in the gas-phase reduction of CO2 is governed mainly by the desorption rate of the reaction intermediates and final products. This indicates that the specific surface area of TiO2 and binding strength of reaction intermediates and products are the main factors affecting the photocatalytic activity of TiO2 in the investigated process. Additionally, it was shown that rutile exhibits higher photocatalytic activity than anatase/rutile mixtures mainly due to its high efficiency in the visible portion of the electromagnetic spectrum.

Original languageEnglish
Article number47
Pages (from-to)1-12
Number of pages12
JournalCatalysts
Volume11
Issue number1
DOIs
Publication statusPublished - Jan 2021

Keywords

  • Adsorption
  • Anatase
  • CO reduction
  • Deactivation
  • Photocatalysis
  • Rutile
  • TiO

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