Vabilo na Preglov kolokvij / Invitation to the Pregl Colloquium, 19.2.2015 ob / at 13:00

[Brigita Pirc]

VABILO NA PREGLOV KOLOKVIJ / INVITATION TO THE PREGL COLLOQUIUM

Prof. Dr. Angelos M. Efstathiou
Chemistry Department, Heterogeneous Catalysis Laboratory, University of Cyprus, 1 University Avenue,
University Campus, 1678 Nicosia, Cyprus


Četrtek / Thursday, 19. 2. 2015, ob / at 13:00
Velika predavalnica Kemijskega inštituta / Lecture Hall at the National Institute of Chemistry, Hajdrihova 19, Ljubljana

Fundamental Understanding of De-NOx and WGS Catalysis
Using Transient and Transient Isotopic Techniques

The development of new green industrial NOx control catalytic technologies operated in a low-temperature range (ca. 120-200oC), and based on other than ammonia reducing agents, remains a very important target since it could reduce the operational and investment costs compared to the present NH3- and urea-SCR technologies, and be easily retrofitted in existing industrial plants. The design of such new de-NOx catalytic systems would largely be facilitated if important kinetic and mechanistic information at the molecular level can be obtained using in situ kinetic and spectroscopic techniques (operando methodology). For example, the design of an industrial supported metal/metal oxide catalytic system would require to know whether and to what extent the support material influences the catalytic rate (bifunctional catalysis). It becomes also important to know how the support chemical composition influences specific kinetic parameters, such as the surface concentration of the active intermediate species, their site reactivity (k, s-1), and the chemical nature of the active intermediates that are found in the rate-controlling step.

The application of Steady-State Isotopic Transient Kinetic Analysis (SSITKA) technique and other transient isotopic experiments coupled with infrared spectroscopic measurements have proven to provide significant understanding towards several important de-NOx catalytic reactions. The latter is demonstrated through the present lecture by providing examples from the literature regarding the H2-SCR of NOx control. In particular, the effect of support chemical composition, Pt metal particle size, and reaction temperature on supported-Pt performance, the nature, location (metal vs. support) and surface concentration of active and inactive NOx adsorbed reaction intermediate species, and the role of gaseous oxygen on the de-NOx reaction rate and N2-selectivity will be reviewed.

The application of similar techniques towards the understanding of essential mechanistic aspects of the Low-Temperature Water-Gas Shift Reaction will also be illustrated over supported Pt catalysts.

[1] C.N. Costa, A.M. Efstathiou, J. Phys. Chem. C 111 (2007) 3010.
[2] P.G. Savva, A.M. Efstathiou, J. Catal. 257 (2008) 324.
[3] C.M. Kalamaras, S. Americanou, A.M. Efstathiou, J. Catal. 279 (2011) 287.
[4] C.M. Kalamaras, D. Dionysiou, A.M. Efstathiou, ACS Catalysis 2 (2012) 2729.

Vljudno vabljeni! / Kindly invited!

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