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Showing papers on "Noble metal published in 1985"



Patent
27 Sep 1985
TL;DR: In this paper, Fischer-Tropsch synthesis over a special Zr, Ti or Cr promoted co-catalyst is followed by hydroconversion of the total synthesized product over a supported noble metal catalyst.
Abstract: Middle distillates are prepared from syngas by a two-stage series-flow process comprising (1) Fischer-Tropsch synthesis over a special Zr, Ti or Cr promoted Co-catalyst followed by (2) hydroconversion of the total synthesized product over a supported noble metal catalyst.

143 citations



Journal ArticleDOI
TL;DR: The Journal of Physical Chemistry is published by the American Chemical Society as discussed by the authors, which is a journal of the American Society of Chemical Engineers (A.C.S. 1155 Sixteenth Street N.W., Washington, DC 20036.
Abstract: The Journal of Physical Chemistry is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Photoassisted hydrogen production using visible light and coprecipitated zinc sulfide.cntdot.cadmium sulfide without a noble metal N. Kakuta, K. H. Park, M. F. Finlayson, A. Ueno, A. J. Bard, A. Campion, M. A. Fox, S. E. Webber, and J. M. White J. Phys. Chem., 1985, 89 (5), 732-734• DOI: 10.1021/j100251a002 • Publication Date (Web): 01 May 2002 Downloaded from http://pubs.acs.org on February 12, 2009

102 citations


Journal ArticleDOI
01 Dec 1985-Talanta
TL;DR: The properties of the new ehelate-forming "POLYORGS" sorbents for concentration of noble metals are discussed and some methods of noble metal determination after preliminary concentration of POLyORGS sorbent are given.

68 citations


Journal ArticleDOI
TL;DR: In this paper, the oxidation mechanism of NiAl was investigated in the temperature range between 1170 K and 1420 K, and it was shown that NiAl diffusion through the sclae is the major material transport mechanism during oxidation, resulting in outside scale growth.

67 citations


Patent
07 Aug 1985
TL;DR: In this paper, a noble metal tip in contact with the leading end face of the center or ground electrode is enlarged to form a flange, and the strength between the welded joint is satisfactorily increased.
Abstract: A spark plug in which a noble metal tip welded to the leading end face of a center electrode is in the form of a fine wire while a noble metal tip welded to the leading end face of a ground electrode is in the form of a wire or column; and when each of the noble metal tips is electrically welded to the leading end face of the center or ground electrode, the end of the noble metal tip in contact with the leading end face of the center or ground electrode is enlarged to form a flange. Therefore the strength between the welded joint between the noble metal tip and the center or ground electrode is satisfactorily increased.

57 citations


Patent
Timothy R. Felthouse1
11 Feb 1985
TL;DR: In this article, a microcrystalline support having a noble metal located within its pores, is used as a permselective catalyst to oxidize formaldehyde and similar materials while avoiding poisoning by N-phosphonomethylamines.
Abstract: Processes are given for which a microcrystalline support having a noble metal located within its pores, is used as a permselective catalyst to oxidize formaldehyde and similar materials while avoiding poisoning by N-phosphonomethylamines. The permselective catalyst can be used as a co-catalyst with activated carbons in the oxidation of N-phosphonomethyliminodiacetic acid to N-phosphonomethylglycine.

54 citations


Patent
25 Nov 1985
TL;DR: In this paper, a process for preparing a noble metal-containing zeolite catalyst of high noble metal dispersion is described, in which the process of crystallizing a Zeolite from a forming mixture which contains an organic template is described.
Abstract: A process is disclosed for preparing a noble metal-containing zeolite catalyst of high noble metal dispersion. The process of crystallizing a zeolite from a forming mixture which contains an organic template, treating the zeolite by calcining or chemical oxidation to remove the template from the zeolite, mulling the zeolite with an inorganic oxide binder and a noble metal-containing solution, and thereafter extruding the blended mixture.

51 citations


Journal ArticleDOI
TL;DR: In this paper, the performance of a supported bimetallic catalyst was investigated with in situ Mossbauer spectroscopy and X-ray photoelectron spectrographs.

45 citations


Journal ArticleDOI
Abstract: Presentation et discussion de resultats d'essais cycliques effectues sur des catalyseurs Pt, Pd, Rh

Patent
13 Mar 1985
TL;DR: In this article, an electrically and mechanically sound conductive bond between layers of a multi-layer plated through hole circuit board is produced by depositing a layer of noble metal over the surfaces to be joined, juxtaposing the noble metal coated layers and subjecting them to a combination of pressure and heat for a sufficient period of time.
Abstract: An electrically and mechanically sound conductive bond between layers of a multi-layer plated through hole circuit board is produced by depositing a layer of noble metal over the surfaces to be joined, juxtaposing the noble metal coated layers and subjecting them to a combination of pressure and heat for a sufficient period of time. Excellent results have been obtained in a multi-layer circuit board for a microstrip microwave antenna with 0.002 inch thick polished silver layers at bonding pressures of 490 to 575 psi and temperatures of 560 to 580 degrees F. for time periods of 20 to 30 minutes.

Journal ArticleDOI
TL;DR: In this article, it was shown that the reduction of ClO4− on Ru electrodes appears to be a very slow process which is only detected at low potential scan rates but is markedly enhanced by temperature and perchlorate concentration.


Patent
07 Aug 1985
TL;DR: In this paper, the authors present a collection of thin film conductor compositions comprising an admixture of finely divided particles of A. noble metal, noble metal alloy or mixtures thereof, and B. organic medium.
Abstract: TITLE THICK FILM CONDUCTOR COMPOSITION ABSTRACT Thick film conductor compositions comprising an admixture of finely divided particles of A. noble metal, noble metal alloy or mixtures thereof, and B. inorganic binder comprising a glass corresponding to the formula Bi4Si3-xGex012, having ZnO dissolved therein, and C. A glass bleed-out inhibitor selected from pyrochlore-related oxides, metal resinates and mixtures thereof, all of A through C being dispersed in. D. organic medium.

Patent
24 Oct 1985
TL;DR: In this paper, a film of noble metal or corrosion resisting metal is formed on the surface of minute high impurity copper wire having the specified value of impurity, which comprises noble metal such as alloy, whose main components are Au, Ag, Pt, Pd, and corrosion resistances metal, such as Ni, Co, Cr, Ti, and Ni, Ag and Ag.
Abstract: PURPOSE:To prevent oxidation of a surface, by forming a film of noble metal or corrosion resisting metal on the surface of minute high impurity copper wire having the specified value of impurity. CONSTITUTION:On the surface of minute high impurity copper wire having the impurity of 99.999% or higher, a film, which comprises noble metal such as alloy, whose main components are Au, Ag, Pt, Pd, and corrosion resisting metal, whose main components are Ni, Co, Cr, Ti, is formed. The surface property of the surface-coated minute high impurity copper is excellent. There is almost no time change. Even after bonding, stable performances can be obtained.

Journal ArticleDOI
TL;DR: In this article, the results from voltammetric studies (i.e., linear potential sweep and rotating disc electrode) using the bulk metal electrodes are described and compared with residual current voltage plots in acid electrolyte alone.

Patent
21 Nov 1985
TL;DR: A method for reactivating noble metal-containing zeolites containing sulfur oxide poisoned noble metal such as oxygen regenerated platinum zeolite beta catalysts, by contacting the catalyst with an acidic aqueous solution having a pH below about 7.
Abstract: A method for reactivating noble metal-containing zeolites containing sulfur oxide poisoned noble metal such as oxygen regenerated platinum zeolite beta catalysts, by contacting the catalyst with an acidic aqueous solution having a pH below about 7. The solution contains a Bronsted acid compound having a dissociation constant ranging from about 1×10 -14 to about 2×10 -1 .

Patent
11 Feb 1985
TL;DR: In this paper, the authors describe a process in which formaldehyde or formic acid and similar materials are oxidized to produce carbon dioxide and water by contact with oxygen in the presence of a noble metal catalyst on a carbon support that is protected from poisonous amines by a polymer coating.
Abstract: Processes are described wherein formaldehyde or formic acid and similar materials are oxidized to produce carbon dioxide and water by contact with oxygen in the presence of a noble metal catalyst on a carbon support that is protected from poisonous amines by a polymer coating.

Patent
02 Jul 1985
TL;DR: In this article, a novel catalytic composite consisting of Group VIII, noble metal, a co-formed IVA metal component, an alkali metal or alkaline earth metal component and an alumina support having a surface area of from 5 to 150 m 2 /g.
Abstract: A novel catalytic composite is disclosed. Also disclosed is a use for the novel composite and a method for preparing the same. The catalytic composite comprises a Group VIII, noble metal component, a co-formed IVA metal component, an alkali metal or alkaline earth metal component and an alumina support having a surface area of from 5 to 150 m 2 /g. Additionally the alumina support is such that less than about 18% of the total pore volume of the support is associated with pores having mean diameters of about 300 Angstroms or less and more than about 55% of the total pore volume of the support is associated with pores having mean diameters of about 600 Angstroms or more. The novel catalytic composite has particular utility as a paraffin dehydrogenation catalyst.

Patent
23 Dec 1985
TL;DR: In this article, a process for rejuvenation of a deactivated highly siliceous noble metal-containing zeolite catalyst which contains agglomerated noble metals was described, which consisted of initially reducing the deactivated catalyst in hydrogen, pretreating the thus reduced catalyst with an inert gas stream containing about 0.001 to 10 weight percent hydrogen chloride, redispersing the noble metal with an inactive noble metal in the form of Cl 2 or Cl-containing organic material, and subsequently reducing the catalyst.
Abstract: A process is described for rejuvenation of a deactivated highly siliceous noble metal-containing zeolite catalyst which contains agglomerated noble metals. The process comprises initially reducing the deactivated catalyst in hydrogen, pretreating the thus reduced catalyst with an inert gas stream containing about 0.001 to 10 weight percent hydrogen chloride, redispersing the noble metal with an inert gas stream containing about 0.001 to 10 weight percent Cl in the form of Cl 2 or Cl-containing organic material, and subsequently reducing the catalyst. The Cl-treatments may optionally occur in the presence of oxygen or sources of oxygen.

Journal ArticleDOI
TL;DR: In this article, the formation of both acetic acid and ethyl acetate at high temperatures is further evidence that a surface acetate species is present, and the surface ethoxy species and the adsorbed surface α-acetate have been identified usingin situ infrared spectroscopy.

Patent
24 Sep 1985
TL;DR: In this paper, a ternary catalyst for the exhaust gas discharged from an internal-combustion engine, more particularly automobile, in which the catalyst component consisting of platinum and/or rhodium is deposited on a catalyst carrier 1 and the coating layer 3 of alumina contg. of 50-95% oxide such as cerium oxide or nickel oxide acting as the oxygen storage capability lending agent and slight amt of palladium is provided on the catalyst layer 2.
Abstract: PURPOSE:To obtain a catalyst having excellent oxidation performance and heat resistance for cleaning up of an exhaust gas by providing a coating layer contg. a large amt. of an oxygen storage capability lending agent (OSC agent) and slight amt. of palladium atop of a catalyst layer contg. a catalyst component consisting of a noble metal or base metal. CONSTITUTION:This invention relates to the ternary catalyst for the exhaust gas discharged from an internal-combustion engine, more particularly automobile, in which the catalyst layer 2 contg. the catalyst component consisting of platinum and/or rhodium is deposited on a catalyst carrier 1 and the coating layer 3 of alumina contg. 50-95wt% oxide such as cerium oxide or nickel oxide acting as the oxygen storage capability lending agent and slight amt. of palladium is provided on the catalyst layer 2. Then the performance for cleaning up the exhaust gas is improved and the heat resistance is obtd. without the formation of a compd. by the active component and the OSC agent.



Journal ArticleDOI
TL;DR: Electron spectroscopic studies of Au-Ag-Cu alloys of the type used for dental castings show that small additions of palladium reduce essentially the thickness of the sulfide layer formed on surfaces of samples treated in aqueous Na2S solutions.
Abstract: Electron spectroscopic studies of Au-Ag-Cu alloys of the type used for dental castings show that small additions (less than or equal to 3 wt%) of palladium reduce essentially the thickness of the sulfide layer formed on surfaces of samples treated in aqueous Na2S solutions. Relative to silver, palladium does not enrich in the sulfide, but statistically significant enrichment is found immediately below the sulfide layer. This enrichment probably takes place during the exposure of the substrate surface to atmosphere before the sulfiding treatment. The mechanism of the impeding effect of palladium on sulfiding is assumed to be a decrease in diffusion from the bulk alloy to the surface due to the enriched layer. The effect cannot be explained by changes in the electronic structure of the alloy due to palladium alloying.

Journal ArticleDOI
TL;DR: In this paper, the performance of tritium in the Pt- or Pd-alumina catalysts is investigated and the adsorption of tritiated water in the catalyst bed is discussed.

Journal ArticleDOI
TL;DR: By using megaelectronvolt 4He ion backscattering techniques and transmission electron microscopy, this article investigated the interactions of ion beams with thin film structures in a number of silicide-forming systems.

Patent
22 Feb 1985
TL;DR: There are described noble metal alloys for dental purposes, especially for firing on dental porcelain which are low melting, do not discolor the porcelains, are repeatedly castable, and making possible brazing joints as mentioned in this paper.
Abstract: There are described noble metal alloys for dental purposes, especially for firing on dental porcelain which are low melting, do not discolor the porcelain, are repeatedly castable, and making possible brazing joints. These alloys containing 20 to 65% gold, 25 to 65% palladium, 0 to 7% gallium, 0.2 to 11% indium and/or tin, 0 to 2% copper, 0.05 to 1% ruthenium, iridium and/or rhenium, 0 to 1% vanadium, 0 to 1% iron and additionally 0.5 to 15% cobalt, with the proviso that the content of base metals must exceed 5%.

Journal ArticleDOI
TL;DR: In this paper, a unified approach based on an embedded cluster model was adopted to study the properties of surface impurities at the surface of host metals, where the electronic structure of the chemisorbed system was compared to photoemission data when available, from which interpretation of details of the experimental spectra may be made.