Vabilo na predavanje / Invitation to the Lecture

[Brigita Pirc]

VABILO NA PREDAVANJE / INVITATION TO THE LECTURE


Prof. Dr. Sena Yaşyerli
Gazi University, Department of Chemical Engineering, Ankara, Turkey
syasyerli at gazi.edu.tr<mailto:syasyerli at gazi.edu.tr>




Četrtek / Thursday, 11. 7. 2013, ob / at 13:00

Velika predavalnica Kemijskega inštituta / Lecture Hall at the National Institute of Chemistry, Hajdrihova 19, Ljubljana

High Temperature H2S Removal and Selective Catalytic Oxidation of H2S


Due to its toxic and corrosive nature, H2S should be safely removed from the gases produced in gasification or combustion processes. In our previous studies, a number of metal or mixed metal oxides (Cu, V, Mo, Mn, Fe, Ce) were investigated for high temperature removal of H2S as sorbent and selective oxidation of H2S as catalyst. These sorbents were synthesized by the complexation method. Characterization results showed that mixed metal oxides such as Cu2V2O7, CuMoO4, CeVO4 can be obtained in a highly porous structure with a moderate BET surface area. Reaction mechanisms proposed were tested by using the concentrations versus time data of H2S, SO2 and H2O in the effluent stream of the fixed-bed reactor. The deactivation model developed was applied to predict sorption rate parameters. Among the mixed oxides studied in our group, Mn-Ce and Mn-Cu mixed oxide sorbents showed higher reactivity, higher retention capacity and good regenerability properties. In addition to these mixed metal oxides, mesoporous supported (copper incorporated MCM-41) sorbents were developed and used for H2S sorption. All Cu-based, Ce-based and Fe-based mixed oxide catalysts gave high activity and selectivity for H2S oxidation. Oxidation state of active metal in catalyst structure has a crucial effect on selective oxidation of elemental sulfur. Incorporation of ceria into Fe based catalyst significantly improved the redox ability of the catalyst.
In this presentation, a review of our studies on high temperature H2S removal and selective catalytic oxidation of H2S to elemental sulfur will be given.



Vljudno vabljeni! / Kindly invited!

info: prof. dr. Albin Pintar, albin.pintar at ki.si<mailto:albin.pintar at ki.si>


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