A5091278191- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Laser-Ablation Synthesis of Nanoparticles
- Catalysts for Methane Reforming
- Crystallization and Solubility Studies
- Nanomaterials for catalytic reactions
- X-ray Diffraction in Crystallography
- Ammonia Synthesis and Nitrogen Reduction
- Copper-based nanomaterials and applications
- Advanced Photocatalysis Techniques
- Diamond and Carbon-based Materials Research
- Electrocatalysts for Energy Conversion
- Catalysis and Hydrodesulfurization Studies
- ZnO doping and properties
- Semiconductor materials and devices
- nanoparticles nucleation surface interactions
- Carbon Nanotubes in Composites
- Graphene research and applications
- Gas Sensing Nanomaterials and Sensors
- Laser-induced spectroscopy and plasma
- Copper Interconnects and Reliability
- Nanoparticles: synthesis and applications
- Electronic and Structural Properties of Oxides
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Chemical Physics Studies
Boreskov Institute of Catalysis
2015-2024
Siberian Branch of the Russian Academy of Sciences
2009-2022
Novosibirsk State University
2011-2020
Novosibirsk Tuberculosis Research Institute
2020
Russian Academy of Sciences
2007-2013
Copper(II) oxide nanopowders exhibit a high catalytic activity in CO oxidation at low temperatures. The combination of situ XPS, XRD, and HRTEM methods was applied to investigate initial steps CuO nanoparticles reduction, identify oxygen copper species revealed structural features the dependence on reducing power reaction medium. At deficient surface metastable Cu4O3 formed under mild conditions −10–5 mbar or + O2 mixture with excess. Destruction structures strong medium (P(CO) ≥ 10–2 mbar)...
Reducing the operating temperature of oxidation catalysts is important for designing energy efficient processes, extending catalyst lifetime, and abating pollutants, especially in cold climates. Herein, high CO activity at sub-ambient temperatures reported Pt/CeO2 with content Pt form dispersed Pt2+ Pt4+ centers. Whereas reference 1 wt%Pt was active only above 100ᵒC, 8 20 converted 60 90 % CO, respectively, below 0ᵒC. Ionic platinum shown to facilitate oxygen release from ceria lower...
Oxidized palladium nanoparticles, PdOx (x ≈ 1.3), measuring approximately 3 nm in size were prepared by RF-discharge under an oxygen atmosphere. The Pd3d X-ray photoelectron spectra (XPS) of oxidized nanoparticles show two main peaks with binding energy Eb(Pd3d5/2) at ∼336.5 and 338.6 eV, which assigned to Pd2+ Pd4+ species, respectively. Attempts synthesize pure plasma treatment without the presence unsuccessful. High-resolution transmission electron microscopy (HRTEM) data defect structure...
Studies of highly oxidized rhodium species as potential active sites in catalytic oxidation reactions are great interest. In this work, we investigated the properties nanostructured film prepared by radio frequency discharge an oxygen atmosphere. The charge states Rh RhOx particles, their thermal stability, and reactivity toward CO were analyzed comparison with thermally Rh2O3 oxide. formation Rh4+ a composition Rh4+/Rh3+ oxyhydroxide structures was shown to take place plasma-synthesized...
Pt–CeO2 nanocomposites were obtained by coprecipitation, varying the Pt loading over a wide range of 1–30 wt %. The samples calcined in air at 450–1000 °C. investigated set structural (X-ray diffraction, extended X-ray absorption fine structure (EXAFS), pair distribution function (PDF), and transmission electron microscopy) spectroscopic photoelectron spectroscopy Raman spectroscopy) methods. Over whole loading, main species Pt2+ Pt4+. They localized either single-atom state or form PtOx...
CO molecules can be efficiently oxidized over Pt/CeO2 catalysts, but the stability and reactivity of different states Pt in catalysts are still unclear. Here we combine experimental computational methods to characterize subjected reductive oxidative pre-treatments exposed oxidation reaction conditions. Particles metallic Pt, known catalytically active at elevated temperature, shown precursors for formation, under operando conditions, more stable PtOx particles that enable below room...
Platinum-oxide nanoparticles were prepared through the radio-frequency (RF) discharge sputtering of a Pt electrode in an oxygen atmosphere. The structure, particles size, electronic properties, and surface composition RF-sputtered studied by using transmission electron microscopy X-ray photoelectron spectroscopy. application RF method resulted formation highly oxidized Pt(4+) species that stable under ultrahigh vacuum conditions up to 100 °C, indicating capability -O play important role...
Abstract Two series of Pt/γ‐Al 2 O 3 catalysts for low temperature NH oxidation were prepared using Pt(NO ) 4 and H PtCl 6 precursors. Using both precursors results in the formation small Pt particles (d<1.5 nm), however, Cl‐containing give a higher fraction highly dispersed species. Such species show high stability against thermal or treatment probably due to presence substantial amount chlorine on surface. Treatment samples from with leads metallic nanoparticles accompanied by...
Abstract The pulsed laser ablation (PLA) in alcohol and water media was employed to prepare Pt CeO 2 PLA‐nanoparticles of different sizes degrees defectiveness. Interactions metallic platinum ceria particles were studied using the thermal activation Pt–CeO mechanical mixtures CO+O reaction medium or O atmosphere. resulted oxidized 2+ /Pt 4+ states surface solid solutions PtCeO x and/or PtO clusters. Catalysts formed after calcination PLA‐ablated oxygen at 450–600 °C revealed CO conversion...
Abstract This review analyzes the literature data and results of studies Pt/CeO 2 ‐based catalysts that are capable providing low‐temperature CO oxidation (LTO CO). The summarizes catalytic characteristics main properties necessary for at T<50 °C. Analysis on use physical methods investigation their correlation with activity allowed us to conclude active forms platinum small metallic clusters, single atoms Pt 2+ ‐SA oxide clusters PtO x interacting ceria nanoparticles. It has been...
Abstract The results of study the surface chemistry nanodiamonds treated by a mixture HClO4 and H2SO2 acids are presented. Changes composition diamond groups brought up thermal annealing were monitored Fourier transformed infrared spectroscopy temperature‐programmed desorption. decomposition oxygen‐containing is observed at 300–900°C; CHx decompose 700–1150°C. process ND was investigated X‐ray photoelectron spectroscopy. clear onset graphitization temperature 950°C that supported appearance...
A series of tetraalkylammonium salts with anionic platinum nitrato complexes (Me4N)2[Pt2(μ-OH)2(NO3)8] (1), (Et4N)2[Pt2(μ-OH)2(NO3)8] (2), (n-Pr4N)2[Pt2(μ-OH)2(NO3)8] (3b), (n-Pr4N)2[Pt(NO3)6] (3a), and (n-Bu4N)2[Pt(NO3)6] (4) were isolated from nitric acid solutions [Pt(H2O)2(OH)4] in high yield. The structures 2, 3a, 3b, 4, prepared for the first time, characterized by X-ray diffraction. sorption [Pt(NO3)6]2– [Pt2(μ-OH)2(NO3)8]2– onto ceria surface acetone 4 1 was examined. dimeric anion...
NAP-XPS and<italic>operando</italic>XAS study of Pt/TiO<sub>2</sub>catalysts shows that Pt<sup>0</sup>species stabilized on TiO<sub>2</sub>surface have the highest activity at low-temperature NH<sub>3</sub>oxidation.
The oxidized palladium nanoparticles comprising Pd4+ species were prepared by radio frequency (RF) discharge in an O2 atmosphere and analyzed with X-ray photoelectron spectroscopy. PdOx particles deposited on CeO2 or the reference support (Ta2O5) variation of RF sputtering time. Regardless used support, small (d < 1 nm) contained only Pd2+ species, while increase particle size led to appearance additional Pd state—Pd4+. stabilization surface defect PdO was proposed. PdOx/CeO2 system stable...