Removal of pyridine from liquid and gas phase by copper forms of natural and synthetic zeolites |
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Authors: | Reháková Mária Fortunová Lubica Bastl Zdeněk Nagyová Stanislava Dolinská Silvia Jorík Vladimír Jóna Eugen |
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Affiliation: | 1. Institute of Chemistry, Faculty of Science, P.J. Šafárik University, 041 54 Košice, Slovak Republic;2. J. Heyrovsky Institute of Physical Chemistry, ASCR, v.v.i., 18223 Prague 8, Czech Republic;3. Department of Physics, Electrotechnical Faculty, Technical University, 042 00 Košice, Slovak Republic;4. Institute of Geotechnics, Slovak Academy of Sciences, 043 53 Košice, Slovak Republic;5. Department of Inorganic Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, 81237 Bratislava, Slovak Republic;6. Department of Chemistry and Technology of Inorganic Materials, Faculty of Industrial Technologies, Tren?ín University of Alexander Dub?ek, 02032 Púchov, Slovak Republic |
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Abstract: | Zeoadsorbents on the basis of copper forms of synthetic zeolite ZSM5 and natural zeolite of the clinoptilolite type (CT) have been studied taking into account their environmental application in removing harmful pyridine (py) from liquid and gas phase. Sorption of pyridine by copper forms of zeolites (Cu-ZSM5 and Cu-CT) has been studied by CHN, X-ray photoelectron spectroscopy, X-ray powder diffractometry, FTIR spectroscopy, thermal analysis (TG, DTA and DTG) and analysis of the surface areas and the pore volumes by low-temperature adsorption of nitrogen. The results of thermal analyses of Cu-ZSM5, Cu-(py)(x)ZSM5, Cu-CT and Cu-(py)(x)CT zeolitic products with different composition (x depends on the experimental conditions of sorption of pyridine) clearly confirmed their different thermal properties as well as the sorption of pyridine. In the zeolitic pyridine containing samples the main part of the pyridine release process occurs at considerably higher temperatures than is the boiling point of pyridine, which proves strong bond and irreversibility of py-zeolite interaction. FTIR spectra of Cu-(py)(x)zeolite samples showed well resolved bands of pyridine. The results of thermal analysis and FTIR spectroscopy are in a good agreement with the results of other used methods. |
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Keywords: | Natural zeolite Clinoptilolite ZSM5 Copper Pyridine |
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