X-ray photoelectron spectra of halogens in coordination compounds

Nefedov, V. I.

doi:10.1016/0368-2048(77)85097-4

Cited by 69 publications

(75 citation statements)

References 27 publications

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“…After reduction this signal was slightly shifted to a lower B. E. (335.1 eV) pointing to the presence of Pd(0) [38]. The position of this peak coincided with that reported for silica-supported Pd [39] and also for bulk metal Pd [40]. For the SiZr-1.0Pd/Pt-4 catalyst, the peak in the core level of Pt 4f 7/2 , before and after reduction (figure 1a and b), was made up of two contributions at 71.3 (56.5 %) and 73.0 eV (43.5%) assigned to Pt(0) and Pt(II) respectively [38].…”

Section: Catalyst Characterisationsupporting

confidence: 71%

Nanosized Pd/Pt and Pd/Rh Catalysts for Naphthalene Hydrogenation and Hydrogenolysis/Ring-opening

et al. 2006

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Pd/Rh and Pd/Pt catalysts supported on two different mesoporous materials -a Zr-doped MCM-41-type silica [Si/Zr = 5 w/w (SiZr)] and a commercial silica-alumina [Si/Al = 40:60 w/w (SiAl)] -were prepared by incipient wetness impregnation using nanosized suspensions of alloy particles prepared by polyol-mediated synthesis in diethylene glycol (DEG). The catalytic behaviour of these catalysts was investigated in the hydrogenation and hydrogenolysis/ring-opening of naphthalene at 6.0 MPa, by checking the role of both the main reaction conditions (temperature, contact time and H 2 /naphthalene molar ratio) and increasing amounts of dibenzothiophene (DBT). The catalysts supported on SiAl showed higher activity than catalysts supported on SiZr, thus suggesting that activity is favoured by higher acidity of the support and/or higher interaction of the nanosized metal particles with the support. While using the SiZr support, weaker metal-support interactions took place by forming catalysts with bigger metal and/or metal oxide particles. Besides, the catalyst with lowest noble-metal content (0.3 wt.%) (SiAl-0.3Pd/Pt-5) had the greatest acidity and metal surface and, consequently, the highest activity. Furthermore, it exhibited a good thiotolerance in presence of increasing amounts of DBT in the feed, thus maintaining a high catalytic activity in the hydrogenation of naphthalene, although with decreased yield in trans-and cis-decalin (decahydronaphthalene or DeHN) and high-molecular-weight compounds (H.M.W.), with a corresponding increased yield in the partially hydrogenated tetralin (tetrahydronaphthalene or TeHN).

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Section: Catalyst Characterisationsupporting

confidence: 71%

Nanosized Pd/Pt and Pd/Rh Catalysts for Naphthalene Hydrogenation and Hydrogenolysis/Ring-opening

et al. 2006

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“…3,4 The metal mass flow is equal to q Me D KÐvÐ MexCy , Pa/s, where v is the coating deposition velocity, MexCy is the density of carbide, and K is the coefficient dependent on the molecular mass of metals K Ti D 0.08; K Zr D 0.088 . 4,5 Thermodynamic properties of TiC x and ZrC x in a wide range of temperatures 6 were used for phase composition prediction. The acetylene pressures and substrate temperatures are listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…These shifts are similar to those reported for TiC, graphite and diamond. 5,6 The intensity of the free state carbon line increases with increasing concentration (pressure) of reactive gas. Free carbon in the TiC-based coating has an input in the structure of the valence band.…”

Section: Figure 1 P-t-c Diagrams With Phase Composition Of Pvd Coatimentioning

confidence: 98%

“…The energy state and relationship between intense peaks conforms with the theoretical DOS of diamond. 5 It is known that the characteristic feature of the energy-band structure of diamond is the absence of -electrons. However, in the sample under examination, the low DOS is found not only in the -states region of 5-8 eV, but also in the states region of 0-5 eV due to a small quantity of carbyne in the PVD coating.…”

Section: Figure 1 P-t-c Diagrams With Phase Composition Of Pvd Coatimentioning

confidence: 99%

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Experimental verification of PTC diagrams for TiC and ZrC PVD coatings and determination of free carbon state by AES, XPS and HREELS methods

Ковалев

Wainstein

Karpman

et al. 2004

Surface & Interface Analysis

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Several PVD coatings based on Ti and Zr carbides and on HSS steel were investigated. The partial pressure of the active gas (N 2 , C 2 H 2 ) and substrate temperature were varied over a wide range. The P-T-C diagrams for prediction of coating compositions, dependent on substrate temperature and gas pressure, were calculated using the thermodynamic technique for phase equilibria based on the principle of maximum entropy in an isolated thermodynamic system. The chemical composition, and electronic and atomic structure of coatings were investigated using the AES, XPS and HREELS methods.

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“…After elimination of the instrumental broadening, the line was divided into two parts: one, coming from the carbon dissolved in a-iron, and the other, originating from the carbon that was the part of the carbide phases. The procedure 18,19,22) was used for the purpose. The dissolved carbon atoms practically do not react with Fe, so that the position of the corresponding spectrum line was assumed to coincide with that characteristic to pure graphite.…”

Section: Discussionmentioning

confidence: 99%

Enhanced Plasticity of a Tool Steel Near .ALPHA.-.GAMMA. Transformation

2005

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Phase transformations, high-temperature mechanical properties of a tool steel as well as its structure before and after rolling were studied with the aim of clarifying why high-carbon highly-alloyed steels can be rolled with rather high degrees of deformation at moderately low temperatures (ϳ800°C). Three factors were found to bring the steel mechanical properties to the level that makes this type treatment possible. They are: 1) higher plasticity and lower strength of a-phase as compared with g-phase at the same temperature; 2) stability of the ferrite-carbide state up to temperatures exceeding 800°C; 3) plasticity induced by a→g transformation in the process of rolling.

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X-ray photoelectron spectra of halogens in coordination compounds

Cited by 69 publications

References 27 publications

Nanosized Pd/Pt and Pd/Rh Catalysts for Naphthalene Hydrogenation and Hydrogenolysis/Ring-opening

Nanosized Pd/Pt and Pd/Rh Catalysts for Naphthalene Hydrogenation and Hydrogenolysis/Ring-opening

Experimental verification of PTC diagrams for TiC and ZrC PVD coatings and determination of free carbon state by AES, XPS and HREELS methods

Enhanced Plasticity of a Tool Steel Near .ALPHA.-.GAMMA. Transformation

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