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Nagendra Kulal, Speaker at Chemical Engineering Conferences
King Fahd University of Petroleum and Minerals, Saudi Arabia
Title : Perovskite GdFeO3 to reduces the deactivation of catalyst in dehydrogenation of ethylbenzene to styrene reaction

Abstract:

Styrene (ST) is a key monomer for the synthesis of polymers produced from the dehydrogenation of ethylbenzene (EB) over an iron-based catalyst. However, due to the endothermic nature of the reaction at higher temperatures, Fe-based catalysts deactivate. At 600 °C reaction temperature, Fe2O3 is converted to Fe3O4 via reduction utilizing H2 as a byproduct. As a result, EB and ST significantly bind strongly to the Fe3O4 sites, leading to the deactivate the catalyst. In this work, we synthesized a Gd-promoted Fe/Al2O3 stable catalyst and compared its catalytic activity with Fe/Al2O3. The presence of GdFeO3 perovskite in Gd/Fe/Al2O3 reduces catalyst deactivation due to the fact that the Fe3+ reduction temperature in GdFeO3 is greater than that in Fe2O3. The catalyst was synthesized by the coprecipitation method and tested at 600 °C with WHSV 1.15 h-1 using CO2 as an oxidant.

Audience TakeWay

The endothermic dehydrogenation reaction of EB to ST at a higher temperature with a Fe-based catalyst undergoes deactivation over a period of time. At a reaction temperature of 600 °C, Fe2O3 is converted to Fe3O4 via reduction, utilizing H2 as a byproduct. As a result, EB and ST significantly bind strongly to the Fe3O4 sites, leading to the deactivation of the catalyst. In this study, Gd/Fe2O3/Al2O3 is the novel catalyst for dehydrogenation of EB to ST and shows better catalytic performance than Fe2O3/Al2O3. The formation of the new perovskite phase GdFeO3 in the Gd/Fe/Al2O3 is due to the reaction of Gd and Fe during the synthesis. The Fe in the GdFeO3 is stable and reduces at higher temperatures compared to the Fe in the Fe2O3. The activity of the 4% Gd/10% Fe/Al2O3 catalyst for dehydrogenation of EB to ST was compared with that of the 10% Fe/Al2O3 catalyst using CO2 as a mild oxidant under atmospheric pressure with 1.15 h-1 WHSV at 600 °C. During 30 hours’ time on the stream study, EB conversion decreased from 66% to 38% while using the 10%Fe/Al2O3 catalyst. Conversely, using a 4%Gd/10%Fe/Al2O3 catalyst marginally decreased the EB conversion from 52% to 48%. This result indicates that at 600 °C, the Fe2O3 phase reduces to Fe3O4 in 10% Fe/Al2O3, which leads to the deactivation of the catalyst. Whereas in the 4% Gd/10%Fe/Al2O3 catalyst, the presence of perovskite GdFeO3 is more stable than Fe2O3, which reduces the deactivation of the catalyst.

Biography:

Dr. Nagendra Kulal studied MSc Chemistry at St. Alysiuos College, Mangalore, India, and graduated in 2014. Later, he began working as an industrial project researcher at the Poornaprajna Institute of Scientific Research in Bengaluru, India. He received his PHD degree in 2021 from the Manipal Academy of Higher Education, India. He is currently working as a postdoctoral researcher at King Fahd University of Petroleum Minerals, Saudi Arabia.

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