NDLI: Cuo–ZnO–Al<sub>2</sub>O<sub>3</sub> mixed oxides: preparation, bulk and surface characterization

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Phase diagrams of inorganic materials: applications to complex solid-solution systems, site substitutions and stoichiometry–property correlations

Investigation of the spin-glass Sr₂FeNbO₆ by extended X-ray absorption fine structure and Mössbauer spectroscopy

Reinvestigation of the mixed-metal periodates M′MIO₆(M′= alkali metal, M = Ge, Sn, Pb)

Extended X-ray absorption fine structure study of potassium and caesium phyllomanganates

Carnotite analogues: synthesis, structure and properties of the Na_1–xK_xUO₂VO₄ solid solution (0 x1)

Controlled polymerisation of silicic acids derived from mineral silicates. Part 3.— formation and reactions of Q_xM_y(O_1/2R)_z

Effect of addition of chromium(VI) oxide on the formation of the Tl–Sr–Ca–Cu–O 1212 phase

Immobilization and photoacoustic spectroscopy of N-(2-pyridyl)acetamide cation complexes bonded to silica gel

Exchange and pyrolysis in mixed trialkylgallanes

Structure, electrical conductivity and dielectric relaxation of charge-transfer complexes with 2,4,6,8-tetramethoxydibenzoselenophene as a donor

Synthesis and non-linear optical properties of substituted styrylpyridinium–MPS₃ intercalation compounds (M = Mn, Cd)

Cuo–ZnO–Al₂O₃ mixed oxides: preparation, bulk and surface characterization

Reduction behaviour of Fe³⁺/Al₂O₃ obtained from the mixed oxalate precursor and the formation of the Fe⁰–Al₂O₃ metal–ceramic composite

Low-temperature structure of KUO₂PO₄·3D₂O determined from combined synchrotron radiation and neutron powder diffraction measurements

Solubility and water-softening properties of a crystalline layered sodium silicate, SKS-6

Inorganic crystal structure prediction using simplified potentials and experimental unit cells: application to the polymorphs of titanium dioxide

Characterisation and purity of siloxane side-chain liquid-crystalline polymers by gel-permeation chromatography and dielectric relaxation spectroscopy

Thermodynamic calculation of phase equilibria in the CaF₂–SiO₂–CaO system

Synthetic study of nanocrystalline complex oxides LaFe_1–yCo_yO₃

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Journal of Materials Chemistry Vol - 3 Issue - 4

Journal of Materials Chemistry Vol - 3 Issue - 3

Journal of Materials Chemistry Vol - 3 Issue - 2

Cuo–ZnO–Al₂O₃ mixed oxides: preparation, bulk and surface characterization

Content Provider	Royal Society of Chemistry (RSC)
Author	Jacono, Mariano Lo Campa, Maria Cristina Fierro, Giuseppe Moretti, Giuliano Stoppa, Luisa Porta, Piero Minelli, Giuliano
Copyright Year	1993
Abstract	CuO–ZnO–Al2O3 mixed oxides with different Cu : Zn : Al atomic ratios were obtained by thermal decomposition of hydroxycarbonate) precursors at 623 K in air for 24 h. Both precursors and mixed oxides were characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS); surface area determination was also performed. The XRD patterns of the precursors show that, as a function of the Cu : Zn : Al atomic ratio, parent phases to hydrozincite, aurichalcite, malachite, gerhardtite, hydrotalcite and boehmite are present. In the calcined samples zincite, tenorite and spinel-like phases are present. The occurrence of Cu2+ species in C3v and in D4h symmetries has been evidenced by DRS in the most zinc-rich CuO–ZnO and in the most aluminum-rich CuO–ZnO–Al2O3 samples, respectively. A comparative study of the photoelectron and X-ray excited Auger transition of Cu and Zn species shows an increasing covalency of the Cu—O chemical bond in the CuO–ZnO samples with low copper loading and the formation of a copper–zinc ‘surface spinet’ in the oxide samples with high aluminum content. The quantitative XPS investigation has shown that the surface Cu : Zn atomic ratios are lower than those found by chemical analysis, thus pointing to a surface segregation of ZnO and/or of zinc ‘surface spinel’ phases. The surface segregation tends to be higher when the catalyst precursors are polyphasic.
Starting Page	505
Ending Page	511
Page Count	7
File Format	PDF
ISSN	09599428
Volume Number	3
Issue Number	5
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9930300505
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	DRS Cu X-ray crystallography Spectroscopy X-ray photoelectron spectroscopy Photoemission spectroscopy Hydrozincite Aurichalcite Malachite Hydrotalcite Boehmite Calcination Zincite Tenorite Chemical bond Copper Spinet Zinc Spinel
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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