Determination of Extinction Coefficients for Describing Gas Adsorption on Heterogeneous Catalysts Using In-Situ DRIFT Spectroscopy
Diffuse reflection infrared Fourier transform (DRIFT) spectra have been quantitatively evaluated to determine unknown extinction coefficients as well as the number of active surface centers and the amount of adsorbed species. Sulfated zirconia with <i>n</i>-butane as probe gas was used a...
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MDPI AG
2020-07-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/10/7/735 |
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| author | Maja Glorius Tobias Reich Cornelia Breitkopf |
| author_facet | Maja Glorius Tobias Reich Cornelia Breitkopf |
| author_sort | Maja Glorius |
| collection | DOAJ |
| description | Diffuse reflection infrared Fourier transform (DRIFT) spectra have been quantitatively evaluated to determine unknown extinction coefficients as well as the number of active surface centers and the amount of adsorbed species. Sulfated zirconia with <i>n</i>-butane as probe gas was used as model system. For quantitative evaluation of <i>n</i>-butane adsorption at 323 K, the sulfate band S=O at 1400 cm<sup>−1</sup> was chosen. During adsorption, this band is red-shifted to lower wavenumbers accompanied by a structural change of the band indicating isomerization reaction. By analyzing difference spectra and determining the areas of the selected band, the extinction coefficients as well as the number of active centers and the amount of chemisorbed <i>n</i>-butane were calculated. The quantitative evaluation results in a mean internal decadic extinction coefficient of 60 cm<sup>−1</sup> µmol<sup>−1</sup>, an average amount of <i>n</i>-butane adsorbed to the sulfated zirconia of about 4 μmol, and a number of active centers of around 21 μmol/g. These results correspond very well with values from the literature obtained by microcalorimetry. Thus, this method is suggested to be transferred also to unknown systems of interest. |
| first_indexed | 2024-03-10T18:43:22Z |
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| id | doaj.art-3579bf880bdd4ba5a5fb11fe6de36001 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T18:43:22Z |
| publishDate | 2020-07-01 |
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| series | Catalysts |
| spelling | doaj.art-3579bf880bdd4ba5a5fb11fe6de360012023-11-20T05:41:51ZengMDPI AGCatalysts2073-43442020-07-0110773510.3390/catal10070735Determination of Extinction Coefficients for Describing Gas Adsorption on Heterogeneous Catalysts Using In-Situ DRIFT SpectroscopyMaja Glorius0Tobias Reich1Cornelia Breitkopf2Chair of Technical Thermodynamics, Technische Universität Dresden, Helmholtzstr. 14, 01062 Dresden, GermanyAugust Storck KG, Paulinenweg 12, 33790 Halle (Westfalen), GermanyChair of Technical Thermodynamics, Technische Universität Dresden, Helmholtzstr. 14, 01062 Dresden, GermanyDiffuse reflection infrared Fourier transform (DRIFT) spectra have been quantitatively evaluated to determine unknown extinction coefficients as well as the number of active surface centers and the amount of adsorbed species. Sulfated zirconia with <i>n</i>-butane as probe gas was used as model system. For quantitative evaluation of <i>n</i>-butane adsorption at 323 K, the sulfate band S=O at 1400 cm<sup>−1</sup> was chosen. During adsorption, this band is red-shifted to lower wavenumbers accompanied by a structural change of the band indicating isomerization reaction. By analyzing difference spectra and determining the areas of the selected band, the extinction coefficients as well as the number of active centers and the amount of chemisorbed <i>n</i>-butane were calculated. The quantitative evaluation results in a mean internal decadic extinction coefficient of 60 cm<sup>−1</sup> µmol<sup>−1</sup>, an average amount of <i>n</i>-butane adsorbed to the sulfated zirconia of about 4 μmol, and a number of active centers of around 21 μmol/g. These results correspond very well with values from the literature obtained by microcalorimetry. Thus, this method is suggested to be transferred also to unknown systems of interest.https://www.mdpi.com/2073-4344/10/7/735DRIFT spectroscopyextinction coefficientszirconia<i>n</i>-butaneadsorption |
| spellingShingle | Maja Glorius Tobias Reich Cornelia Breitkopf Determination of Extinction Coefficients for Describing Gas Adsorption on Heterogeneous Catalysts Using In-Situ DRIFT Spectroscopy Catalysts DRIFT spectroscopy extinction coefficients zirconia <i>n</i>-butane adsorption |
| title | Determination of Extinction Coefficients for Describing Gas Adsorption on Heterogeneous Catalysts Using In-Situ DRIFT Spectroscopy |
| title_full | Determination of Extinction Coefficients for Describing Gas Adsorption on Heterogeneous Catalysts Using In-Situ DRIFT Spectroscopy |
| title_fullStr | Determination of Extinction Coefficients for Describing Gas Adsorption on Heterogeneous Catalysts Using In-Situ DRIFT Spectroscopy |
| title_full_unstemmed | Determination of Extinction Coefficients for Describing Gas Adsorption on Heterogeneous Catalysts Using In-Situ DRIFT Spectroscopy |
| title_short | Determination of Extinction Coefficients for Describing Gas Adsorption on Heterogeneous Catalysts Using In-Situ DRIFT Spectroscopy |
| title_sort | determination of extinction coefficients for describing gas adsorption on heterogeneous catalysts using in situ drift spectroscopy |
| topic | DRIFT spectroscopy extinction coefficients zirconia <i>n</i>-butane adsorption |
| url | https://www.mdpi.com/2073-4344/10/7/735 |
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