Entity

Time filter

Source Type


Pakharukova V.P.,Novosibirsk State University | Moroz E.M.,RAS Boreskov Institute of Catalysis | Zyuzin D.A.,RAS Boreskov Institute of Catalysis | Ishchenko A.V.,RAS Boreskov Institute of Catalysis | And 2 more authors.
Journal of Physical Chemistry C | Year: 2015

The structure of copper oxide species in Cu/ZrO2 catalysts with monoclinic zirconia as a support was studied. The catalysts with various copper loadings (3-40 wt % of Cu) prepared by impregnation technique were characterized using N2O titration, X-ray diffraction (XRD) analysis, radial distribution function (RDF) of electron density, and high-resolution transmission electron microscopy (HRTEM). It was established that the Cu/ZrO2 catalysts contained highly dispersed CuO particles along with the large ones. Geometrical similarity between the CuO and ZrO2 monoclinic structures favors stabilization of the highly dispersed CuO particles on the support with low specific surface area. © 2015 American Chemical Society. Source


Pakharukova V.P.,Novosibirsk State University | Moroz E.M.,RAS Boreskov Institute of Catalysis | Zyuzin D.A.,RAS Boreskov Institute of Catalysis | Zaikovskii V.I.,RAS Boreskov Institute of Catalysis | And 3 more authors.
Journal of Physical Chemistry C | Year: 2012

The structure development of nanocrystalline yttria-stabilized zirconia (ZrO 2-3.4 mol % Y 2O 3) synthesized by coprecipitation of hydroxides followed by microwave drying and calcination in the temperature range from 300 to 1000 °C was investigated. A complex series of methods was used for the structure characterization: X-ray diffraction (XRD) analysis, radial distribution function of electronic density (RDF), small-angle X-ray scattering (SAXS), and high-resolution transmission electron microscopy (HRTEM). The wide range of the used techniques allowed us to reveal the structure formation at all hierarchic levels of organization: atomic level, where features of the local atomic arrangement were discovered; crystallite level; and the level of secondary particles (aggregates), where grain boundaries are formed and nanostructuring takes place. The nanostructure features, the grain boundaries containing a lot of defects, were found to improve the catalytic performance of zirconia in CO oxidation. The results demonstrated that significant changes of zirconia properties can be expected when the material is transformed into the nanostructural state. © 2012 American Chemical Society. Source

Discover hidden collaborations