Platinum Metals Rev., 1969, 13, (3), 120
NEW PATENTS: July 1969
METALS AND ALLOYS
e. i. du pont de nemours & co. British Patent 1,144,930
A noble metal alloy metallising composition comprises a Pd-Au, Pt-Au, Ag-Au, Ag-Pt or Pd-Pt alloy in powder form (average particle size not greater than 40 μ). The alloy powder is dispersed in an organic vehicle (which may contain a vitreous binder) and constitutes 10−70 wt% of the metallising composition.
Finely Divided Metals of the Platinum Group
monsanto co. British Patent 1,146,530
A salt of a Pt metal is reduced in the presence of an alcohol, acetal, ketone, ether, carboxylic acid ester or olefine which complexes the metal formed. The complex is then decomposed.
Noble Metal Alloy for Porcelain Cladding
deutsche gold- & silber-scheideanstalt U.S. Patent 3,413,723
A dental alloy adapted for fixing on porcelain coverings consists essentially of 80−90% Au, 5−15% Pt, 0.1−2% In, 0.1−2% Sn and 0.05−1% Re. Other compositions with the same components are specified.
Production of Alloys of Platinum Metals
johnson matthey & co. ltd Dutch Patent 68.09,169
Thermal sensitivity in Pt metal alloys is reduced by introducing a maximum of 20 at.% of one or more of Se, Ti, V, Y, Zr, Nb, Hf and the lanthanides.
Improved Method of Coating and Inlaying
ELECTRODEPOSITION AND SURFACE COATINGS
Palladium-Nickel Alloy Plating Bath
kabushiki kaisha suwa seikosha nisshin kasei k.k. British Patent 1,143,178
A plating bath for electrodeposition of a Pd-Ni alloy comprises an aqueous solution of Pd and Ni ammines at specified critical concentrations. The relative proportions of Pd and Ni are such as to deposit an alloy with a Pd content of 30−90%. An example bath contains Pd(NH3)Cl2 and NiSO4.7H2O. Optional additives are a soluble salt of a naphthalene sulphonic acid and p − toluenesuplhonamide.
Deposition of Platinum Group Metals
national research development corp. British Patent 1,145,285
Pt or Rh is deposited on a Ni- or Ni/Fe alloy surface by (a ) subjecting the latter to a charging treatment, (b ) introducing H2 and (c ) bringing the treated surface into contact with a solution of a reducible Pt- or Rh-compound. The latter is reduced to metal by the H2. The surface is charged by cathodic treatment in an electrolytic bath.
Porous Cathode Body Coated with Osmium
philips electronic & associated industries ltd British Patent 1,145,967
A porous W cathode body, containing Ba compounds in its interior, is coated with Os by heating the body to an elevated temperature in an atmosphere of H2. The Os coating is formed by the reduction of OsO4. The heated body may be brought into contact with OsO4 vapour or immersed in a solution of OsO4.
johnson matthey & co. ltd British Patent 1,147,563
A Pt-containing dispersion, which forms adherent coatings on the substrates to which it is applied, is prepared by reducing PtO2 and/or a mixture of PtO2 with at least one oxide of the metals Rh, Ru, Ir and Pd. The Pt content should be at least 50% of the metal content of the mixture.
Iridium Coated Graphite Articles
union carbide corp. British Patent 1,149,625
A graphite substrate, resistant to oxidation at temperatures up to 2,000°C, bears an adherent, substantially pore-free coating of Ir consisting of an inner layer adjacent to the graphite substrate. This inner layer is formed of sintered finely divided particles of Ir. An intermediate layer is vapour-plated before the electroplating of an outer Ir layer.
Coating Catalyst for Chemical Plating
LABORATORY APPARATUS AND TECHNIQUE
Welding Iridium and Ruthenium or Their Alloys to Silver
international nickel ltd British Patent 1,145,071
Ag is welded to an Ir or to a Ru body (or an alloy of either) by interposing a bonding agent consisting of a Pd-Ag alloy containing 1−30% Pd (preferred 5%). The invention relates to Ir tips welded to Ag rods in sparking plugs.
Brazing Alloy Compositions
north american rockwell corp. U.S. Patent 3,411,900
An alloy with brazing characteristics equivalent to a Au-Ni braze contains 80−95 wt% Ag, 1−10 wt% Pd, 1−7.5 wt% Cu and 0.5−3.5 wt% Ni with the usual impurities. A preferred composition, in wt% contains 89.5−90.5 Ag, 4.5−5.25 Pd, 3.95−4.5 Cu and 0.90−1.25 Ni.
Improvements in or Relating to the Production of Acetic Acid
b.p. chemicals (u.k.) ltd British Patent 1,142,897
C2H4, steam and a gas containing O2 are reacted in the vapour phase at temperatures of 50−350°C over a supported catalyst comprising Pd metal together with a transition metal (Fe, Ni, Mo, Ce, Cu, Cr, Mn or Co) oxide or salt, or mixtures of oxides, or salts of the same or of different transition metals, e.g. Pd/Al2O3 impregnated with Cr acetate.
Improvements in and Relating to the Oxidation of Ferrous Compounds and to the Reduction of Ferric Compounds
johnson matthey & co. ltd British Patent 1,143,139
A feedstock containing Fe2+ or Fe3+ is reacted with O2 or H2 respectively in an acid solution in the presence of a catalyst comprising at least one Pt-group metal (Pt, Pd, or an alloy of Pt-Pd) on an inert support (charcoal) in a trickle column reactor. The feedstock may be obtained from a steel-pickling liquor or by extracting Fe ore with H2SO4 or HCl.
Dehydrocyclisation of Paraffins
shell internationale research mij. n.v. British Patent 1,143,147
A paraffin with 6−20 C per molecule is contacted at elevated temperatures (482−593°C) with a sulphided catalyst containing at least one noble metal from Group VIII (e.g. a sulphided Ir, Pd or Pt). The catalyst comprises 0.01−5% of the noble metal carried on silica in the presence of 500−10,000 p.p.m. S. The catalyst is prepared by impregnating SiO2 with an aqueous solution of, for example, RhCl3, Pd(NH3)2Cl2, H2IrCl6.6H2O, H2PtCl4.6H2O and dried finally at 371°C before being sulphided with n -hexane containing 1,000 p.p.m. S as dimethylsulphide.
Process and Apparatus for the Manufacture of Nitric Acid
humphreys & glasgow ltd British Patent 1,143,946
A process for the manufacture of HNO3 by the catalytic Pt oxidation of NH3 is performed at a gas-turbine operating pressure. The hot gases from the oxidation stage are expanded in a gas turbine to recover energy.
Hydrogenation Reactions and Catalyst
laporte chemicals ltd British Patent 1,146,437
A hydrogenation catalyst consists of one or more Pt metals deposited on a macroreticular ion exchange resin (e.g. Amberlyst XN–1005) having a surface area of at least 5 m2/g.
Esters of Unsaturated Alcohols
b.p. chemicals (u.k.) ltd British Patent 1,148,583
The catalyst for the vapour phase reaction of C2H4, air and CH3COOH to give vinyl acetate is periodically reactivated by heating the catalyst/support mixture in a liquid alkaline medium. The catalyst comprises a Pt-group metal (Pd) deposited on Al2O3, alumino-silicates, heavy metal oxides, metal oxide/Al2O3 complexes, C or pumice (preferably Al2O3).
universal oil products co. U.S. Patent 3,413,213
A catalyst for reforming gasoline feedstocks is prepared from purified Al2O3 by introducing 50−5,000 p.p.m. of an Fe compound and then impregnating with H2PtCl6 and calcining, the calcined product being sulphided.
Isomerisation of Saturated Hydrocarbons
universal oil products co. U.S. Patent 3,413,369
The isomerisation catalyst is a Group VIII metal, such as Pt, deposited on a refractory support such as Al2O3 which has been treated with AlF or SiF2 vapour at 650−1,200°C. See also 3,413,370−1.
Platinum-Rhenium Naphtha Reforming Catalyst
chevron research co. U.S. Patent 3,415,737
Naphtha free from S may be reformed using a catalyst consisting of 01.−3 wt% Pt and 0.01−5 wt% Re on a porous solid support.
Gas Purification by Hydrogenation
catalysts and chemicals inc. U.S. Patent 3,420,618
O2, C2H4 and C2H2 are removed from a H/CO feedstock by selective hydrogenation using a Pd/Al2O3 catalyst where the Pd content varies with the gas to be removed.
Sulphided Platinum Metal Catalyst
sinclair research inc. U.S. Patent 3,422,002
Hydrocarbons, (e.g. those boiling above 450°F), which contain N impurities are hydrofined using a catalyst consisting essentially of about 0.5−5 wt% of a Pt metal and about 4−30 wt% of MoO on Al2O3. The catalyst is presulphided. Hydrofining conditions include a temperature of about 400−800°F. When using Ru and Ir, temperatures of at least about 635°F are employed.
imperial chemical industries ltd British Patent 1,141,817
An organic substrate containing two or more sites of unsaturation is selectively homogeneously hydrogenated by contacting substrate with H2 in the presence of a solution containing as catalyst a divalent Ru compound (e.g. RuCl2(PPh3)3, RuHCl(PPh3)3 or RuCl2(AsEt2Ph)3) and arresting the reaction when the substrate has reached the required degree of hydrogenation. The catalyst may also contain a hydride e.g. LiAlH4.
Curable Organopolysiloxane Compositions
dow corning corp. British Patent 1,141,868
Organopolysiloxane compositions curable in the presence of Pt compounds (e.g. the reaction product of H2PtCl6 and a vinylated organopolysiloxane) are treated with an inhibitor (e.g. an acetylenic compound) so that the composition may be stored in the presence of the curing agent for considerable length of time without being cured.
Improvements in and Relating to the Production of Organic Isocyanates
imperial chemical industries ltd British Patent 1,142,991
An aliphatic or cycloaliphatic hydrocarbon or substituted hydrocarbon containing at least one -C = CH- group is reacted with isocyanate ions under substantially anhydrous conditions in the presence of a salt or co-ordinated compound of Pd (chloride). The inert solvent may be sulpholane or methylacetamide and there may be a redox system (CuCl2 or an Fe salt) present which is reoxidised by O2. In an example, KCNO + PdCl2 are heated to 90°C in sulpholane and octene −1 added. Metallic Pd is precipitated during the reaction.
geigy (u.k.) ltd British Patent 1,143,065
Butadiene oligomers are produced by heating butadiene in the presence of a catalyst consisting of RhCl3 reduced by reaction with a mixture of C2H5OH and acrylonitrile.
Preparation of Vinyl Esters of Carboxylic Acids
denki kagaku k.k.k. British Patent 1,146,791
The olefine-carboxylic acid reaction in the presence of O2 takes place using a liquid phase containing Pt metal or a Pt compound promoted with a vanadyl salt.
Oxidation of Aromatic Compounds
imperial chemical industries ltd British Patent 1,147,793
Phenols are produced by bringing into contact a liquid aromatic hydrocarbon or phenol with H2 and O2 in the presence of a redox system and a compound of a Group VIII metal (Pd, Ru, Rh, or Pt). The redox system may be an Fe carboxylate (acetate). In examples platinous chloride is the preferred noble metal compound.
Preparation of Aroyl Halides
national distillers and chemical corp. British Patent 1,149,359
An aroyl halide (benzoyl bromide or chloride) is prepared from an arylhalide containing at least one active H by reacting the latter with CO in the presence of a Pt- or Pd-triad catalyst. The catalyst may be palladous or platinous chloride or bromide.
Butadiene Chloride Copolymerisation Catalyst
p.p.g. industries inc. U.S. Patent 3,418,298
Copolymerisation of dichlorobutadiene is catalysed by active Ir, Rh or Ru compounds, such as a cyclooctadiene complex of Rh dichloride.
Platinum Metal Azo Complexes
Catalyst for a Fuel Cell Electrode
american cyanamid co. British Patent 1,144,824
A catalyst for a fuel electrode (H2, CO) of a fuel cell comprises Rh, an amorphous W oxide (valency of W less than 6), Pt, and Mo oxide in specified proportions. It is produced by coprecipitation, from aqueous solution, to form an intimate mixture of an alkali metal borohydride, a Rh salt, a metatungstate, H2PtCl6 and a molybdate.
Catalytic Fuel Cell Electrodes
Separation of Hydrogen from Other Gases
international nickel ltd British Patent 1,147,010
H2 is separated from other gases by bringing the mixture into contact with a Pd sponge or the powder of a Pd-Ag-alloy consisting of at least 70% Pd and specified amounts of Au, Ag, B, Cu, Ni, Ru, Pt and/or Rh. Alternatively inert particles coated with Pd or with such an alloy may be used.
Apparatus for the Production of Glass Filaments
owens-corning fiberglass corp. British Patent 1,143,725
In the formation of glass filaments, molten glass is drawn from Pt or Pt-alloy orifices and cooled by means of Cu or Ag fin shields. The fin shields are plated with Ni so that contact of the fin shield with the hot Pt orifice does not cause contamination of the latter.
ELECTRICAL AND ELECTRONIC ENGINEERING
Method of Producing Semiconductor Devices Having Connecting Leads Attached thereto
sylvania electric products inc. British Patent 1,143,506
The body of a semiconductor material has conductive contacts (Pt silicide) in ohmic connection with its underlying portions. A first temporary layer of conducting material (e.g. Cu) leaves exposed areas on which the conducting leads are to be formed. Then a second layer (e.g. Ti and Pt) is laid over all and the first layer is etched away.
Cathodes for Electrical Discharge Vessels
siemens a.g. British Patent 1,143,865
The emissive substance carrier of a dispenser cathode is covered with a layer of at least one Pt metal, especially a metallic Os layer to reduce the escape energy of the cathode.
Electrodes for Electrolysis
h. b. beer British Patent 1,147,442
An electrode for an electrolytic process comprises a core of a film-forming metal (Ti, Ta, Zr, Nb and alloys) and a layer, the outside portion of which is resistant to electrolyte and electrolysis products and which consists of at least one oxide of a metal selected from Pt, Ir, Rh, Pd, Ru, Os and alloys formed between these metals. The entire layer may be formed of this material or only the outer portions of it.
Composition for Electrical Contacts
e. i. du pont de nemours & co. U.S. Patent 3,413,240
Fired on contacts for Pd-based electrical resistors are produced from (a ) a finely divided Pd, Pd oxide or Pd-Ag alloy, (b ) finely divided Ag and (c ) finely divided ceramic binder.
Palladium Copper Contact
western electric co. U.S. Patent 3,413,711
A metallic lead is soldered to a base of a metal other than Cu but having an affinity with Cu (e.g. a thin film Ta nitride circuit path) by depositing on the lead a layer of Cu of specified thickness, depositing a Pd layer over the Cu layer, applying solder to the lead and the Pd layer to dissolve the Pd and form a bond with the underlying Cu layer.
Metallising Compositions for Conductors and Condenser Electrodes
e. i. du pont de nemours & co. French Patent 1,536,249
The metallising composition consists of 75−95% finely divided noble metal (100 parts Ag, 0−100 parts Pd and 5–40 parts Pt) and 25−5% of a mineral binder e.g. Bi2O3 as a Cd or Na borosilicate glass.
Resistance Film Composition
johnson matthey & co. ltd French Patent 1,541,456
A metallising composition is proposed which produces a film on a non-conducting base whose resistance does not vary firing temperature. It consists of finely divided Ru oxide (preferably 10−80 wt%) or a Ru oxide/Group V metal oxide composition and glass (preferably 90−20 wt%) with optionally up to 10 wt% of a Group I or II metal oxide.
johnson matthey & co. ltd British Patent 1,148,305
A thermocouple has a positive element of a binary Pd-Pt alloy and a negative element of a binary Au-Pd alloy. Both alloys arc made by powder metallurgical methods. The percentage compositions of the alloys are within the ranges: positive element: Pd 80−90 wt%, Pt 10−20 wt%; negative element: Au 50−60 wt%, Pd 40−50 wt%.