Announcements

CHEMISTRY SEMINAR by Emrah Özensoy

Author: COLLEGE OF SCIENCES
Time: 14:30
Location: SCI 103

KOÇ UNIVERSITY CHEMISTRY SEMINAR
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Speaker          :
Emrah Özensoy, Department of Chemistry, Bilkent University

Title                : Catalytic Nanomaterials for Environment & Renewable Energy 

Date                : February 15, 2018 Thursday
Time               : 14:30     
Cookie & Tea: 14:15  SCI 103
Place               :  SCI 103

Abstract         :  In this talk, I will provide a summary of the ongoing research activities in my group focusing on the design, synthesis, characterization, and functional utilization of catalytic nanomaterials. The major emphases of the talk will be the development of novel catalytic nanosytems for environmental and renewable energy applications. Particularly, I will highlight the power of in-situ spectroscopic techniques in obtaining a molecular level understanding of heterogeneous catalytic reaction mechanisms, catalytic activity and catalyst stability. We will start the discussion with our recent studies on the next generation Pt-free hybrid perovskite-based (LaCo1-xMnxO3+z) catalytic emission control systems for air purification and demonstrate that catalyst activity and stability can be fine-tuned by precisely controlling the catalyst composition and crystal structure at the atomic level. This will be followed by our efforts towards photocatalytic oxidation and capture of airborne toxic chemicals (e.g. NOx) without thermal assistance (i.e. at room temperature) using novel semiconductor mixed-metal oxides (e.g. CdTe(QD)/TiO2, CaO/TiO2, mpg-C3N4, Cx/TiO2). Next, we will shift gears to the catalytic production of ultra-pure H2(g) via PdAgCr/MnOx/NHx-SiO2 systems from a renewable feedstock, HCOOH, which can be obtained as a side product from biomass processing. In addition, I will provide some examples about our recent work on the catalytic conversion of bioethanol derivatives into valuable chemicals (aldehydes, esters etc.) and selective catalytic activation of C-H, O-H and N-H bonds of oxygenates and amines using Au(111) and Ag(111) planar model catalyst surfaces under ultra-high vacuum (UHV) conditions. These studies will present a detailed molecular level insight regarding the nature and function of the surface/subsurface oxygen species in selective partial oxidation reactions. Finally, I will conclude my talk by mentioning our ongoing studies on the catalytic exothermic decomposition of ionic liquids for aerospace propulsion technologies.

 

References  

1. Karatok, M.; Vovk, E. I.; Koç, A. V., Ozensoy, E. J. Phys. Chem. C,  2017 (121) 41, 22985.

2. Say, Z.; Mihai, O.; Tohumeken, M.; Ercan, K.E.; Olsson, L.; Ozensoy, E. Catal. Sci. Tech. 2017 (7) 133.

3. Erdogan, D. A; Ozensoy, E. Applied Surf. Sci., 2017 (403) 159.    

4. Kurt, M.; Say, Z.; Ercan, K. E.; Vovk, E. I.; Kim, C. H.; Ozensoy, E. Topics in Catal., 2017 (60) 40.

5. Say, Z.; Mihai, O.; Kurt, M.; Olsson, L.; Ozensoy, E. Catal. Today, 2018 (accepted for publication).

6. A. Bulut, M. Yurderi, Z. Say, H. D. Kivrak, M. Gulcan, M. Kaya, E. Ozensoy, M. Zahmakiran, ACS Catalysis, 10 (2015) 6099.

7. A. Erdogan, T. Solouki, E. Ozensoy, RSC Advances 5 (2015) 41174.

8. Ercan, K. E.; Say, Z.; Kurt, M.; Karatok, M.; Pantaleo, G.; Liotta, L. F.; Ozensoy, E. (2018) in preparation.