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Younes, Mohamed Kadri; Ghorbel, Abdelhamid; Rives, Alain; Hubaut, R.

doi:10.1023/a:1020769331891

Cited by 17 publications

(1 citation statement)

References 5 publications

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“…6 revealed strong support-coating interaction, with a displacement of the bonding energies of the zirconium's 3d5/2 electrons, indicating the existence of two distinct chemical environments for the zirconium deposited on alumina compared with the zirconium oxide. One of these environments is related to the bonding energy of 182 eV, which is the value observed for these electrons in bulk zirconium oxide [17], while the other shows a bonding energy of 183 eV, a value that is associated with zirconium ions bound to more electronegative species [29], which in this case are Zr-O-Al-type bonds formed between the support and the modifier material in response to the incorporation of the coating. The XPS results confirm the strong interaction proposed by HRTEM, which lead the first layer assembling in the support structure.…”

Section: Resultsmentioning

confidence: 90%

Oxide surface modification: Synthesis and characterization of zirconia-coated alumina

Dalmaschio

Mastelaro

Nascente

et al. 2010

Journal of Colloid and Interface Science

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Four aluminas were used as supports for impregnation with a zirconium oxide with the aim to achieve a coating, without phase separation, between support and modifier. The supports were impregnated with different concentrations of zirconium aqueous resin, obtained through the polymeric precursor method. After impregnation the samples were calcined and then characterized by XRD, which led to identification of crystalline zirconia in different concentrations from each support used. Using a simple geometric model the maximum amount of surface modifier oxide required for the complete coating of a support with a layer of unit cells was estimated. According to this estimate, only the support should be identified below the limit proposed and crystalline zirconium oxide should be identified above this limit when a complete coating is reached. The results obtained from XRD agree with the estimated values and to confirm the coating, the samples were also characterized by EDS/STEM, HRTEM, XPS, and XAS. The results showed that the zirconium oxide on the surface of alumina support reached the coating in the limit of 15 Zr nm(-2), without the formation of the ZrO(2) phase.

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Section: Resultsmentioning

confidence: 90%