2,6-Dimethylpiridine adsorption on zirconia and sulfated zirconia systems. An FTIR and microcalorimetric study
| Autor: | C. Morterra, Elisabetta Rombi, Giuseppina Meligrana, Vincenzo Solinas, G. Cerrato, Maria Franca Sini |
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| Jazyk: | angličtina |
| Rok vydání: | 2003 |
| Předmět: |
Isothermal microcalorimetry
Materials science Inorganic chemistry law.invention chemistry.chemical_compound Tetragonal crystal system Adsorption law Desorption Electrochemistry ZrO2 General Materials Science Calcination Cubic zirconia adsorption microcalorimetry Spectroscopy sulphated ZrO2 2 6-dimethylpyridine adsorption Lewis and Brønsted acidity FTIR spectroscopy Surfaces and Interfaces Condensed Matter Physics chemistry Hydroxide Monoclinic crystal system |
| Popis: | In situ FTIR spectroscopy and adsorption microcalorimetry have been employed to study the adsorption/desorption of 2,6-dimethylpyridine (2,6-DMP) on different zirconia and sulfated zirconia (SZ) systems. Adsorption/desorption experiments were carried out at 343 K (beam temperature for all IR experiments) and at 423 K. The adsorbents were (i) a (mainly) monoclinic zirconia, (ii) a crystallographically pure tetragonal zirconia, phase stabilized by formation of a solid solution with 3 mol % Y2O3, (iii) monoclinic sulfated zirconia (m-SZ) and tetragonal sulfated zirconia (t-SZ), both noncalcined and calcined at 923 K, obtained by direct sulfation of the two crystalline ZrO2 specimens, and (iv) two t-SZ specimens (also noncalcined and calcined at 923 K), obtained through the “conventional” sulfation procedure carried out on an amorphous hydroxide precursor and leading, upon thermal treatment at T > 823 K, to crystalline t-SZ. The adsorption/desorption of 2,6-DMP turned out to be a valuable probe for both Brons... |
| Databáze: | OpenAIRE |
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