Spectroscopic Investigation of Carbon Dioxide Interactions with Transition Metal‐Oxide Nanoparticles

• Published in: Chemical engineering & technology 2023-03, Vol.46 (3), p.587-594
• Main Authors: Alalwan, Hayder A., Alminshid, Alaa, Mohammed, Malik M., Mohammed, Mohammed Fakhir
• Format: Article
• Language: English
• Subjects: Adsorption; Bicarbonates; Carbon dioxide; CoO; Copper oxides; CuO; Diffuse reflectance infrared Fourier transform spectroscopy; Diffuse reflectance spectroscopy; Ferric oxide; Fourier transforms; Infrared spectroscopy; Metal oxides; Nanoparticles; Transition metals; α‐Fe2O3
• ISSN: 0930-7516; 1521-4125
• DOI: 10.1002/ceat.202200250

The interactions of carbon dioxide (CO2) with metal oxides are a significant subject due to the numerous applications in which this reaction is involved. Although this reaction has been extensively studied by various infrared (IR) techniques, only a few (if any) have utilized in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). DRIFTS has an essential advantage over other traditional IR techniques in that it involves minimal sample preparation before analysis. In this work, CO2 adsorption on CoO, CuO, and α‐Fe2O3 nanoparticle surfaces was investigated by using DRIFTS. While the majority of species on CoO and CuO surfaces were observed as carbonate, on α‐Fe2O3 bicarbonate was more prevalent. CO2 interaction with CoO, CuO, and α‐Fe2O3 nanoparticles was investigated by diffuse reflectance infrared Fourier transform spectroscopy. While the majority of species on CoO and CuO surfaces are observed as carbonate, on α‐Fe2O3 bicarbonate is more prevalent. Important information on the interfacial species is given which helps to develop better adsorbent and oxygen carrier materials.