| AVS 64th International Symposium & Exhibition | |
| Fundamental Discoveries in Heterogeneous Catalysis Focus Topic | Thursday Sessions |
| Session HC+SA+SS-ThM |
| Session: | Mechanisms and Reaction Pathways in Heterogeneously Catalyzed Reactions |
| Presenter: | Ib Chorkendorff, Technical University of Denmark |
| Correspondent: | Click to Email |
First, we shall discuss how surface science and mass-selected nanoparticles can be used to make efficient model systems for heterogeneous catalysts. We shall demonstrate how mass-selected nanoparticles of CuZn alloys can be used to elucidate the dynamics of the methanol synthesis catalysts. The produced nanoparticles will be compared to the conventional CuZnAl at 1 bar for synthesizing methanol from CO2 and H2 [1, 2, 3]. The methanol synthesis on CuZn will also be discussed with respect to our recent findings of using alloys of NiGa for methanol synthesis [4]. The use of mass-selected nanoparticles will be further demonstrated for electrochemical Oxygen Reduction Reaction, which is really the limiting reaction in Proton Exchange Membrane Fuel Cells. Here we have found entirely new classes of electro-catalysts by alloying Pt with early transition metals [5] or the lanthanides [6]. We have also shown that it is possible to make mass-selected nanoparticles of these alloys with very good activities [7] and PtGd alloys [8]. Finally, we shall also discuss how planar surface science can be used to identify new catalysts for ammonia oxidation. We shall demonstrate how Copper deposited on Ruthenium can enhance the activity substantially and give rational explanations for this enhancement which also can be transferred to high area catalysts used for diesel exhaust treatment [9].
References
1. S. Kuld,....... I. Chorkendorff and J. Sehested, Angew. Chemie 53 (2014) 1.
2. C. Holse,....., I. Chorkendorff,S. Helveg, J. H. Nielsen, J. Chem. Phys. 119 (2015) 2804-2812.
3. S. Kuld,..... I. Chorkendorff,J. Sehested, SCIENCE 352 (2016) 969-974.
4. F. Studt, ......, I. Chorkendorff, and J. K. Nørskov, Nature Chemistry. 6 (2014) 320.
5. J. Greeley, ..... I. Chorkendorff, J. K. Nørskov, Nature Chemistry. 1 (2009) 522.
6. M. Escudero-Escribano, ...., I. Chorkendorff, SCIENCE 352 (2016) 73-76.
7. P. Hernandez-Fernandez, ..... I. Chorkendorff, Nature Chemistry 6 (2014) 732-8.
8. A. Velázquez-Palenzuela,.....I. Chorkendorff, J. Catal. 328 (2015) 297-307.
9. D. Chakraborty, ....., I. Chorkendorff, Accepted Angew. Chemie. (2017).