1 август 2021
Tabakova, T., Petrova, P., Karakirova, Y., Venezia, A. M., Liotta, L. F., Ilieva, L..
(
Йорданка Каракирова;
Петя Петрова;
Татяна Табакова;
)
Abstract
In this paper, the effect of various supports on complete benzene oxidation over Pd catalysts was studied. Benzene was selected as a representative model of volatile organic compounds (VOCs) because it is among the most emitted air pollutants with toxic and carcinogenic nature. Complete catalytic oxidation is a very effective and environmentally-friendly approach for the destructive removal of VOCs from waste gas streams due to the opportunity for а total conversion to CO2 and water at relatively low temperatures. The rational design of catalytic materials with improved efficiency in the elimination of VOCs attracts a substantial interest in the field of environmental catalysis because efficient catalysts should combine high activity with economic feasibility. The aim of the present work was the development of Pd-based catalytic materials with high benzene oxidation activity by using appropriate and economically profitable supports. Two metal oxides, namely Al2O3 and CeO2 were selected, considering the cost-effectiveness of alumina and the beneficial role of ceria in VOCs oxidation. Additionally, high surface area alumina was modified by finely dispersed ceria nanoparticles. The effect of Y-doping of alumina-supported ceria on the activity of Pd catalyst was also studied. Catalytic measurements revealed the best performance of Pd catalyst on Y-doped CeO2 supported on Al2O3. The sample exhibited complete benzene conversion at 175 °C and high stability during 24 hours in a stream. The favorable role of Y-doping in improved oxygen mobility of ceria was evidenced by X-ray photoelectron spectral analysis. A line with g-value 1.964, assigned to Ce3+, was registered in the EPR spectrum of the sample after catalytic test, focusing on the possible role of Ce3+ in oxygen activation. This catalytic material demonstrated the potential to meet the challenging emission regulations in an effective and economically profitable way.
Proceedings of the 7th World Congress on New Technologies (NewTech’21), Avestia, International ASET Inc., 2021, ISBN:978-1-927877-94-4, ISSN:2369-8128, DOI:10.11159/icepr21.108 Международно академично издателство (Друга база (не влиза в К2))
https://avestia.com/NewTech2021_Proceedings/files/paper/ICEPR/ICEPR_108.pdf
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