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Investigation of CO and CO2 Adsorption on Tetragonal and Monoclinic Zirconia
Abstract
The adsorption of CO and CO 2 on tetragonal and monoclinic ZrO 2 was investigated using infrared spectroscopy and temperature-programmed desorption spectroscopy. For this study, samples were prepared of tetragonal ZrO 2 (t-ZrO 2 ) with surface areas of 20 and 187 m 2 /g and of monoclinic ZrO 2 (m-ZrO 2 ) with surface areas of 19 and 110 m 2 /g. The CO 2 adsorption capacity of m-ZrO 2 is more than an order of magnitude higher than that of t-ZrO 2 . The principal species observed on m-ZrO 2 are HCO 3 - and m- and b-CO 3 2 -, whereas the principal species observed on t-ZrO 2 are p- and b-CO 3 - . The higher CO 2 adsorption capacity of m-ZrO 2 is attributed to the higher concentration and basicity of the hydroxyl groups on this polymorph, as well as the stronger Lewis acidity of Zr 4+ cations and the stronger Lewis basicity of O 2 - anions. Depending on the adsorption temperature, the CO adsorption capacity of m-ZrO 2 is 5- to 10-fold higher than that of t-ZrO 2 . Below 450 K, CO is adsorbed as HCO 3 - and CO 3 2 - species on both polymorphs of ZrO 2 . At higher temperatures, only CO 3 2 - and HCOO species are observed. The CO adsorption capacity of m-ZrO 2 is higher than that of t-ZrO 2 because of the greater strength of the adsorption centers on this phase.
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Cited by
Chizallet, C., Lazare, S., Bazer-Bachi, D., Bonnier, F., Lecocq, V., Soyer, E., Quoineaud, A.-A., & Bats, N. (2010) · Journal of the American Chemical Society · doi:10.1021/ja103365s · Cited by 586
Sorbents for CO2 capture from flue gas—aspects from materials and theoretical chemistry
Hedin, N., Chen, L., & Laaksonen, A. (2010) · Nanoscale · doi:10.1039/c0nr00042f · Cited by 243
Metadata
- Authors
- Pokrovski, K., Jung, K. T., & Bell, A. T.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2001-06-02
- Volume
- 17
- Issue
- 14
- Pages
- 4297-4303
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2055100433
- Cited by
- 547
- References
- 0
- FWCI
- 15.95
- Type
- journal article
- Language
- en
- Open access
- closed
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- Pokrovski, K., Jung, K. T., & Bell, A. T. (2001). Investigation of CO and CO2 Adsorption on Tetragonal and Monoclinic Zirconia. Langmuir. https://doi.org/10.1021/la001723z
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