Oxidation of thiophene over copper-manganese mixed oxides |
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Authors: | Małgorzata I Szynkowska Aneta Węglińska Elżbieta Wojciechowska Tadeusz Paryjczak |
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Institution: | (1) Institute of General and Ecological Chemistry, Technical University of Lodz, Zeromskiego 116, 90 - 924 Lodz, Poland |
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Abstract: | Commercial hopcalite calcined at different temperatures and hopcalite modified with noble metals (Pt, Pd, and Au) were studied
in oxidation of thiophene. Surface and bulk properties of catalysts were studied using temperature-programmed reduction (TPRH2), X-ray diffraction method (XRD) and thermal analysis (TG-DTA-MS). It was shown that calcined samples displayed higher activity
in comparison with commercial untreated hopcalite; however, a lower temperature of calcination was favourable. High temperature
of thermal treatment induced an increase in the crystallinity and a decrease in the surface area of the samples, and, as a
consequence, the loss of catalysts activity. Moreover, marked improvement in the catalytic performance of platinum and palladium
modified catalysts in relation to base hopcalite was observed. The obtained results indicate that the higher activity of samples
containing Pt and Pd was accompanied by better reducibility of the catalysts.
Presented at the 35th International Conference of the Slovak Society of Chemical Engineering, Tatranské Matliare, 26–30 May
2008. |
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Keywords: | thiophene VOC oxidation odours hopcalite |
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