Thermal study of adsorbents prepared from waste tyres

Magdalena Hofman-Bieniek, Robert Pietrzak

Laboratory of Applied Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, 61-614 Poznan, Poland

Abstract


Carbonaceous materials were obtained from waste tyres and their potential application as hydrogen sulphide adsorbents was investigated. The adsorbents were obtained by pyrolysis of waste tyres and physical (CO2) or chemical (KOH) activation at 550 and 800 C. The effect of modification conditions on the performance of waste tyres based materials as adsorbents of H2S at room temperature in dry and wet conditions was investigated. Sorption capacity of such adsorbents was found to strongly depend on the temperature and type of modification. Thermogravimetric analysis indicated that the temperature ranges of the mass loss maxima in the samples before and after H2S adsorption process are different. The most significant difference is the appearance of a new peak with a maximum at about 880 C, which can be assigned to the release of compounds containing a sulphur group, generated as a result of H2S adsorption, indicating their strong thermal stability. Moreover, according to TG results the sulphur groups can undergo not only physisorption, but also chemisorption on the surface of adsorbent.

Keywords


chemical activation; H2S adsorption/reduction; pyrolysis; physical activation; waste tyres

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