Journal article

Authors list: Timmer, Phillip; Weber, Tim; Glatthaar, Lorena; Over, Herbert

Publication year: 2023

Journal: Inorganics

Volume number: 11

Issue number: 3

eISSN: 2304-6740

Open access status: Gold

DOI Link: https://doi.org/10.3390/inorganics11030102

Publisher: MDPI

Abstract: 

We combine operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) with on-line mass spectrometry (MS) to study the correlation between the oxidation state of titania-supported IrO₂ catalysts (IrO₂@TiO₂) and their catalytic activity in the prototypical CO oxidation reaction. Here, the stretching vibration of adsorbed CO_ad serves as the probe. DRIFTS provides information on both surface and gas phase species. Partially reduced IrO₂ is shown to be significantly more active than its fully oxidized counterpart, with onset and full conversion temperatures being about 50 °C lower for reduced IrO₂. By operando DRIFTS, this increase in activity is traced to a partially reduced state of the catalysts, as evidenced by a broad IR band of adsorbed CO reaching from 2080 to 1800 cm⁻¹.

Harvard Citation style: Timmer, P., Weber, T., Glatthaar, L. and Over, H. (2023) Operando CO Infrared Spectroscopy and On-Line Mass Spectrometry for Studying the Active Phase of IrO2 in the Catalytic CO Oxidation Reaction, Inorganics, 11(3), Article 102. https://doi.org/10.3390/inorganics11030102

APA Citation style: Timmer, P., Weber, T., Glatthaar, L., & Over, H. (2023). Operando CO Infrared Spectroscopy and On-Line Mass Spectrometry for Studying the Active Phase of IrO2 in the Catalytic CO Oxidation Reaction. Inorganics. 11(3), Article 102. https://doi.org/10.3390/inorganics11030102