Resumo

CABRERA, Marcelo; MONTENEGRO, Lucía  e  MEJIA, Stephanie. Study of Heterogeneous Catalysis with Iron (II) Disulfide as a Treatment in Gaseous Emissions Contaminated with Toluene from Paint Industries. Rev Politéc. (Quito) [online]. 2021, vol.48, n.2, pp.43-52. ISSN 2477-8990.  https://doi.org/10.33333/rp.vol48n2.04.

This research aims to develop an alternative for the treatment of gaseous emissions contaminated with toluene from paint industries, so that it minimizes the risk of affecting the health of workers and neighbors who come into contact with such emissions. To simulate the flow of contaminated air, a prototype of a system based on the evaporation process was developed at laboratory, through which a concentration of toluene equal to 108 parts per million (ppm) was obtained in the air stream. Consequently, a system was designed and developed to treat the stream, composed of the oxidizing agent hydrogen peroxide (H2O2) and the catalyst iron disulfide II (FeS2). First, the effectiveness of H2O2 as a treatment agent was studied, obtaining that at a flow rate of 2 mL/min degraded a 10.1% of the toluene present in the contaminated emission, while a flow rate of 3 mL/min degraded a 10.5%. Next, the effect of the addition of different amounts of iron II disulfide at a concentration equals to 86 %, the degradation of toluene was analyzed. It was determined that 10 g of FeS2 degrade toluene by 36.25 % , while 20 g degrades it by 61.09 % and 30 g degrades it by 70.39 %. Finally, it was concluded that the concentration of toluene in air decreases up to 32 ppm, when working under the best conditions determined of 2 mL/min of H2O2 and 30 g of FeS2.

Palavras-chave : Toluene; heterogeneous catalysis; gaseous emissions; oxidation.

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