Nanostructured metal films: Fabrication and catalytic properties

Rostovshchikova, T. N.; Смирнов, В. В.; Gurevich, S. A.; Kozhevin, V. M.; Yavsin, D. A.; Nevskaya, S. M.; Николаев, С. А.; Локтева, Е. С.

doi:10.1016/j.cattod.2005.06.034

Cited by 34 publications

(17 citation statements)

References 9 publications

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“…1B, that the size of the Ni particles is 1.5 ± 0.5 nm. Narrow particle size distribution is in accordance with the data previously obtained for Ni on Si supports in [6], however, in our case the mean particle size is smaller than in the cited paper (1.5 vs. 2.3 nm). Also, short chains formed by Ni particles are clearly seen in Fig.…”

Section: Hrtem Characterizationsupporting

confidence: 93%

“…As it was demonstrated previously for Pd, Ni, and Cu deposited on C, Si, and SiO 2 /Si [3,6], the size of the metal nanoparticles deposited on the support by the LED method depends on the metal nature only: the mean particle size of Pd is about 2.1 nm, Ni forms particles about 2.3 nm in size, for Cu this value is equal to 5 nm. However, so far no Au nanostructures obtained by LED have been reported.…”

Section: Hrtem Characterizationsupporting

confidence: 64%

“…Pd/C, Ni/C, Pd/Al 2 O 3 , Au/Al 2 O 3 , Ni/Al 2 O 3 , and Au-Ni/Al 2 O 3 catalysts were prepared by LED method as described previously [6]. γ-Al 2 O 3 (180 m 2 /g, AOK-63-11B JSC "Katalizator", grain size about 1 mm) and Sibunit (carbon support [13], 410-406 m 2 /g, grain size 2.5-3.0 mm) were used as supports.…”

Section: Methodsmentioning

confidence: 99%

“…Detailed investigation of such systems for Pd, Ni, and Cu deposited onto flat (Si, SiO 2 /Si, C) and granulated (artificial carbon support Sibunit) supports was performed in a series of works [6][7][8][9]. The results can be summarized as follows:…”

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confidence: 99%

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Laser electrodispersion as a new chlorine-free method for the production of highly effective metal-containing supported catalysts

Локтева

Peristyy

Kavalerskaya

et al. 2012

Pure and Applied Chemistry

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Laser electrodispersion (LED) of metals is a promising technique for the preparation of heterogeneous catalysts as an alternative to wet impregnation of supports with the corresponding salt solutions. The LED technique can be used to deposit highly active chlorideand nitrate-free metal nanoparticles onto carbon or oxide supports. We report preparation and properties of new Ni-, Pd-, and Au-containing alumina-supported catalysts with low metal loadings (10 -3 -10 -4 % mass) and their comparison with the previously studied carbon (Sibunit) supported systems. The catalysts demonstrate high stability and extremely high specific catalytic activity (by 2-3 orders of magnitude higher than for traditional catalysts) in the gas-phase hydrodechlorination (HDC) of chlorobenzene (CB).

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Section: Hrtem Characterizationsupporting

confidence: 93%

Section: Hrtem Characterizationsupporting

confidence: 64%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Laser electrodispersion as a new chlorine-free method for the production of highly effective metal-containing supported catalysts

Локтева

Peristyy

Kavalerskaya

et al. 2012

Pure and Applied Chemistry

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“…Another interpretation may be proposed by a direct interparticle interaction as recently proposed by Rostovshchikova et al [69]. Indeed even if the calculation of the inter-particle distance, from BET surface area value, seems to give rather high values (ranging from 4 to 10 nm), one should consider the real topology of the porous support, including three-dimensional topology which may lead to real inter-particle distances much lower that theoretical ones.…”

Section: Discussionmentioning

confidence: 90%

Synthesis of highly dispersed palladium alumina supported particles: Influence of the particle surface density on physico-chemical properties

Benkhaled

Morin

Pichon

et al. 2006

Applied Catalysis A: General

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Complexation with nitrite ions in aqueous medium was used to prepare highly dispersed Pd8 particles supported on alumina. It has been possible to obtain catalysts with different Pd loading keeping the particle size lower than 1 nm as shown by HRTEM, chemisorption, or extended X-ray absorption fine structure (EXAFS) characterizations, and as a consequence with different particle surface density. We observed that electronic properties measured by IR(CO) or X-ray photoelectron spectroscopy (XPS) measurements are strongly influenced by this last parameter and that the origin of these variations can be related to the different strengths of the interactions of the palladium precursor with the alumina surface sites as shown by low temperature CO adsorption followed by FTIR spectroscopy. On increasing Pd loading, saturation of unsaturated Lewis surface sites follows their acid strength: the more acidic ones are the first to react as germination sites, followed by the medium and finally the weaker sites. These different interactions may explain the variation of electronic properties of such small reduced particles which appears to be very sensitive to the chemical nature of their initial germination site on the oxide support. On the other hand, no such effects were observed on changing the type of alumina (d or g) support, in agreement with the principle of the synthesis method which tends to limit strong interaction with the support. Comparison with Pd8 particles with the same particle size and particle surface density but prepared with the well known grafting of acetylacetonate precursor shows marked differences in terms of electronic properties followed by CO FTIR. This result illustrates the possibility to prepare highly dispersed Pd particles with different physico-chemical properties. #

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