Нанокатализаторы палладия

Palladium nanoparticles for catalysis

Why palladium?
Palladium is one of the most versatile elements from the platinum group metals. Palladium nanoparticles are extensively used as catalysts in a number of industrially relevant reactions. In particular, palladium is recognized as the preferred catalyst for selective hydrogenation of hydrocarbons (e.g. hydrogenation of alkynes in the alkyne/alkene mixtures), selective oxidation of alcohols and full oxidation of methane.
Where is the room for research?
In reaction conditions, palladium nanoparticles may undergo phase changes to palladium hydrides, carbides or oxides. Formation of these phases can dramatically change the catalytic activity and selectivity of the catalysts. Despite numerous theoretical and experimantal investigation the structure-reactivity relationships and the mechanistic understanding of the catalytic reaction on the surface of palladium nanoparticles is still debated. Therefore, investigation of these phase transitions and their effect on the catalytic properties is the problem of both practical importance and fundamental scientific interest.
What problems do we solve?
We investigate the evolution of atomic and electronic structure of palladium-based catalysts by in situ, operando and time-resolved X-ray absorption spectroscopy and X-ray diffraction. Term "operando" means that we perform our measurements under industrially relevant conditions, when our material is working as catalysts for a model reaction (e.g. hydrogenation of acetylene or oxidation of alcohols). We have proposed an approach that allows to discriminate hydride, carbide and oxide phases, as well as their distribution in the volume of the particles, by simultaneous application of XRPD, EXAFS and XANES. In addition, new and original approaches for XANES analysis in combination with theoretical simulations have been developed.

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Who worked in close collaboration with

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Some publications

This list contains 11 publications with total Impact-Factor of 29.146

1. A.L. Bugaev, O.A. Usoltsev, A.A. Guda, K.A. Lomachenko, I.A. Pankin, Yu.V. Rusalev, H. Emerich, E. Groppo, R. Pellegrini, A.V. Soldatov, J.A. van Bokhoven, C. Lamberti "Palladium Carbide and Hydride Formation in the Bulk and at the Surface of Palladium Nanoparticles" The Journal of Physical Chemistry C 2018 122 (22) Accepted Manuscript (Impact-factor: 4.536) DOI: 10.1021/acs.jpcc.7b11473

2. A.L. Bugaev, O.A. Usoltsev, A. Lazzarini, K.A. Lomachenko, A.A. Guda, R. Pellegrini, M. Carosso, J. Vitillo, E. Groppo, J. van Bokhoven, A.V. Soldatov and C. Lamberti "Time-resolved operando studies of carbon supported Pd nanoparticles under hydrogenation reactions by X-ray diffraction and absorption" Faraday Discussions 2018 Accepted Manuscript (Impact-factor: 3.588) DOI: 10.1039/C7FD00211D

3. A.L. Bugaev, A.A. Guda, K.A. Lomachenko, E.G. Kamyshova, M.A Soldatov, G. Kaur, S. Øien-Ødegaard, L. Braglia, A. Lazzarini, M. Manzoli, S. Bordiga, U. Olsbye, K. Petter Lillerud, A.V Soldatov and C. Lamberti "Operando study of palladium nanoparticles inside UiO-67 MOF for catalytic hydrogenation of hydrocarbons" Faraday Discussions 2018 Accepted Manuscript (Impact-factor: 3.588) DOI: 10.1039/C7FD00224F  

4. A. Bugaev , V. Polyakov, A. Tereshchenko, A. Isaeva, A. Skorynina, E. Kamyshova, A. Budnyk, T. Lastovina, A. Soldatov "Chemical Synthesis and Characterization of Pd/SiO2: The Effect of Chemical Reagent" Metals 2018 8 (2) 135 (Impact-factor: 1.984) DOI: 10.3390/met8020135    

5. A.L. Bugaev, A.A. Guda, K.A. Lomachenko, V.V. Shapovalov, A. Lazzarini, J.G. Vitillo, L.A. Bugaev, E. Groppo, R. Pellegrini, A.V. Soldatov, J.A. van Bokhoven, C. Lamberti "Core-shell structure of palladium hydride nanoparticles revealed by combined X-ray absorption spectroscopy and X-ray diffraction" Journal of Physical Chemistry C 2017 121 (33) 18202–18213 (Journal Cover) (Impact-factor: 4.536) DOI: 10.1021/acs.jpcc.7b04152  

6. A.L. Bugaev, A.A. Guda, A. Lazzarini, K.A. Lomachenko, E. Groppo, R. Pellegrini, A. Piovano, H. Emerich, A.V. Soldatov, L.A. Bugaev, V.P. Dmitriev, J.A. van Bokhoven, C. Lamberti "In Situ Formation of Hydrides and Carbides in Palladium Catalyst: When XANES is better than EXAFS and XRD" Catalysis Today 2017 283 (1) 119–126 (Impact-factor: 4.312) DOI: 10.1016/j.cattod.2016.02.065  

7. A. L. Bugaev, A. A. Guda, K. A. Lomachenko, A. Lazzarini, V. V. Srabionyan, J. G. Vitillo, A. Piovano, E. Groppo, L. A. Bugaev, A. V. Soldatov, V. P. Dmitriev, R. Pellegrini, J. A. van Bokhoven and C. Lamberti "Hydride phase formation in carbon supported palladium hydride nanoparticles by in situ EXAFS and XRD" Journal of Physics: Conference Series 2016 712 (1) 012032 DOI: 10.1088/1742-6596/712/1/012032    

8. Aram L. Bugaev, Alexander A. Guda, Kirill A. Lomachenko, Lusegen A. Bugaev, Alexander V. Soldatov "Pd hydride and carbide studied by means of Pd K-edge X-ray absorption near-edge structure analysis" Bulletin of the Russian Academy of Sciences. Physics 2015 79 (9) 1180-1185 (Impact-factor: 0.313) DOI: 10.3103/s1062873815010098    

9. Aram L. Bugaev, Alexander A. Guda, Kirill A. Lomachenko, Vasiliy V. Srabionyan, Lusegen A. Bugaev, Alexander V. Soldatov, Carlo Lamberti, Vladimir P. Dmitriev, Jeroen A. van Bokhoven "Temperature- and Pressure-Dependent Hydrogen Concentration in Supported PdH x Nanoparticles by Pd K-Edge X-ray Absorption Spectroscopy" The Journal of Physical Chemistry C 2014 118 (19) 10416-10423 (Impact-factor: 4.772) DOI: 10.1021/jp500734p    

10. Vasiliy V. Srabionyan, Aram L. Bugaev, Vasiliy V. Pryadchenko, Leon A. Avakyan, Jeroen A. van Bokhoven, Lusegen A. Bugaev "EXAFS study of size dependence of atomic structure in palladium nanoparticles" Journal of Physics and Chemistry of Solids 2014 75 (4) 470-476 (Impact-factor: 1.517) DOI: 10.1016/j.jpcs.2013.12.012    

11. Aram L. Bugaev, Vasiliy V. Srabionyan, Alexander V. Soldatov, Lusegen A. Bugaev, Jeroen A. van Bokhoven "The role of hydrogen in formation of Pd XANES in Pd-nanoparticles" Journal of Physics: Conference Series 2013 430 (1) 012028 DOI: 10.1088/1742-6596/430/1/012028