Platinum Metals Rev., 1976, 20, (3), 105
NEW PATENTS: July 1976
METALS AND ALLOYS
Platinum Group Metal Alloys
ELECTRODEPOSITION AND SURFACE COATINGS
Electrodeposition of Ductile Palladium
international business machines corp. U.S. Patent 3,920,526
An aqueous electrodeposition bath for electrodepositing non-porous, ductile Pd consists of 16−32 g/l Pd(NH3)2 Cl2 and 65−250 g/l of NH4Cl and aqueous NH3 to provide a pH ≥8.8.
Electroplating a Gold-Platinum Alloy
u.s. energy research and development administration U.S. Patent 3,923,612
An aqueous electrolyte solution for the electrodeposition of Pt-Au alloys consists of an alkali metal hexahydroxyplatinate and an alkali metal aurate where the pH of the solution is above 11.0. A typical solution containing 21 g/l Pt as K2Pt(OH)6 and 2.8 g/l Au as KAuO2 was used to plate clean brass parts. The bath was operated at 65°C using a 0.2A current. The composition of the final deposit was 30%Pt-70%Au and the deposit was of high quality.
Bright Palladium Electrodeposits
american chemical & refining co. inc. U.S. Patent 3,925,170
A bright plating bath contains 0.02−0.25g mole/l Pd, 0.9−3.6g mole/l NH4OH, 0.1−0.7g mole/l alkali metal or NH4 salt electrolyte, a Co and/or Ni brightener and a small amount of cetyl trimethyl NH4Br.
Palladium Electroplating Bath
LABORATORY APPARATUS AND TECHNIQUE
Explosive Gas Detectors
secretary of state for trade and industry British Patent 1,427,515
The detector has a reaction chamber containing a Pd/ThO2 catalyst, means for admitting and retaining a discrete sample of gas in the chamber, and integrating measuring means for determining the entire effect of the gas on the catalyst body.
Joining a Thermoplastic Part to a Mesh Part
joseph lucas ltd. British Patent 1,425,030
In the joining of a thermoplastic synthetic resin material part to a mesh part in a metal-air battery cell, a Pt, Pd or Ag on C catalyst layer is arranged to form the air electrode of the cell.
Metallised Isotropic Boron Nitride Body
raytheon co. U.S. Patent 3,926,571
An isotropic boron nitride body is metallised with an alloy or intimate mixture formed from an active metal, Zr, Ti or Hf, dissolved in a solder metal, such as Ni, Pt, Cu, Au or Ag, the remainder of the alloy being Mo. The solder metal has a lower melting point than the active metal hydride, and the Mo is selectively added for increasing craze resistance.
Bonded Silver Article
electro oxide corp. U.S. Patent 3,929,491
A metallising composition consists of an intimate mixture of 0.5−5.0% of an initial mixture of CdO powder and at least one Cu oxide powder, 0.25−2.0%of Pt, Ir, Rh and/or Os powder, 0.50−4.0% of Ru oxide and the balance Ag and/or Ag oxide. The metallising composition further includes about 10.0−95.0% of the intimate mixture of an organic binder.
Catalysts for Synthesis of Methane and Steam, etc. and Reforming of Hydrocarbons
british gas corp. British Patent 1,422,327
A catalyst is composed of 1−20% Ru or a Ru compound, 30−50% ZnO or a Zn compound, calculated as ZnO, and 65−35% catalyst carrier.
ford motor co. ltd. British Patent 1,424,629
In the preparation of an I.C.E. exhaust catalyst, Ru is reacted with O2 and a compound based on an alkaline earth, a rare earth or mixed rare earths to form a ruthenate compound, and the compound is powdered, slurried with a γ-Al2O3 containing substance, deposited on a support, dried and calcined.
NOx Removal with Stabilised-Ruthenium Catalysts
exxon research & engineering co. U.S. Patent 3,922,235
A stabilised supported Ru catalyst consists of Ru metal in combination with an oxide support selected from Zr titanate and Zr titanate mixed with TiO2, the Ru is present in an amount ≤0.003g Ru/g of oxide support.
Production of Secondary Alkyl Primary Amines
texaco inc. U.S. Patent 3,923,893
The amine is separated from a mixture of un-reacted paraffin and by-products by catalytic hydrogenation of the mixture in the presence of a Pt/Al2O3 catalyst at 600−700°F, and recycling the hydrogenated product for nitration with an n -paraffin.
Reaction of Chlorosilanes with Unsaturated Organic Compounds
union carbide corp. U.S. Patent 3,925,434
The Pt-catalysed addition reaction of a chlorosilane, containing at least one H bonded to Si, with an olefinically unsaturated hydrocarbon other than acrylonitrile, is accelerated by 0.001−10% of a promoter selected from phenothiazine, diphenylamine, N,N-diphenyl-p-phenylenediamine or phenoxazine.
High Octane Motor Fuel Production
universal oil products co. U.S. Patent 3,930,986
The process consists of a new form of low severity hydrocracking followed by catalytic reforming. Hydrocracking is carried out in the presence of a 0.01−2% Pd catalyst, and reforming is carried out in the presence of a Pt catalyst.
I.C.E. Exhaust Catalysts
w. r. grace & co. U.S. Patent 3,932,309
An I.C.E. exhaust gas conversion catalyst is prepared from a solution of a Pt, Pd or Pt-Pd complex salt having the formula M6(Z)(SO3)4 or M2(Z) (SO3)2 where M is Na, NH4 or H ion and Z is Pt and/or Pd, then impregnating Al2O3, SiO2-Al2O3, mullite, cordierite or ZrO2 with the solution, drying in air at 800−1400°F for 1 to 4 h or in a reducing environment at 600−800°F for 0.5 to 2 h and recovering the catalyst product.
Process for Preparation of Naphthol
sumitomo chemical co. ltd. U.S. Patent 3,935,282
Alpha-naphthol is produced by dehydrogenating ketotetrahydronaphthalene in the presence of Pt, chloroplatinic acid or a chloroplatinate, a Na sulphate, carbonate, acetate, chloride or chloroplatinate and a Mn salt and/or a Cr compound on an Al2O3 support.
Hydrocarbon Hydrotreatment Catalysts
compagnie francaise de raffinage French Appl. 2,260,382
The catalyst consists of a mineral oxide support including a combined halogen, and a combination of 0.02−2%, preferably 0.1−0.7%, Pt group metals; 0.02−2%, preferably 0.02−0.6%, of at least one of Mo, Cr and Mn; 0.02−2%, preferably 0.05−1.0%, Sn and optionally 0.05−0.5% S.
Hydrodealkylation of Aromatic Alkyl Hydrocarbons
institut francais du petrole French Appl. 2,262,654
The process is carried out in the presence of a catalyst consisting of Al2O3 support, 0.05−5% of at least one metal chosen from Ni, Ru, Os, Pd, Rh, Ir, Pt and 0.05−5% of at least one metal chosen from Zn, Cd, Ga, In, Tl and Ge.
Partial Hydrogenation Catalyst
olin corp. U.S. Patent 3,923,850
In processes for preparing an organic isocyanate by reacting an organic nitro compound with CO in the presence of a catalyst, improved recovery of the isocyanate is obtained when the reaction is carried out in the presence of a hydroxyl-substituted hydrocarbon. Preferred catalysts are prepared from halides and oxides of Pd, Rh, Ir and Ru (mixtures) with a hydroxyl-substituted hydrocarbon, e.g., Pd(py)2Cl2, py is pyridine.
Alcohol Carbonylation Catalyst
b.p. chemicals international ltd. U.S. Patent 3,923,880
Alcohols and alcohol derivatives are carboxylated to carboxylic acids using as catalyst a cationic complex of Rh or Ir in which the anion is not halide. A typical complex has the formula (MLm(CO)nS1)kA in which M is Rh or Ir, L is a stabilising ligand, e.g. acetonitrile, S is a solvent ligand, e.g. benzene, and m, n, etc. are 0–5.
Production of Aromatic Isocyanates
sumitomo chemical co. ltd. U.S. Patent 3,925,436
Aromatic isocyanates are produced by reacting an aromatic nitro compound with CO in the presence of a catalyst at an elevated temperature under an elevated pressure. The catalyst is a product obtained by contacting halides, carbonyl halides, complexes and complex salts of Pd, Rh, Ir, Ru, Pt and Os with a copolymer of styrene, vinylpyridine and divinylbenzene.
Ruthenium Complexes as Catalysts for Reduction of Polyenes
phillips petroleum co. U.S. Patent 3,925,494
A catalyst for the partial hydrogenation of 1,5, 9-cyclododecatriene to cyclododecene is a Ru ligand complex catalyst consisting essentially of (Ph3P)2(CO)3Ru or [Ru(CO)4]3.
Selective Hydrocarboxylation of Unsaturated Fatty Compounds
u.s. secretary of agriculture U.S. Patent 3,928,231
Carboxy acids are prepared in high yields by reacting without isomerisation unsaturated vegetable oil with CO and H2O in the presence of a highly selective catalyst system consisting of PdCl2 mixed with a trisubstituted phosphine chosen from triphenylphosphine and trialkylphosphine.
Preparing Super-High Purity Hydrogen
uralsky ordena trudorogo krasnogo znameni politekhnichesky institut imeni s. m. kirova British Patent 1,426,644
Water vapour is added to a gaseous flow containing H2O-free H2 to form a gaseous mixture in which the partial pressure of H2O vapour is not less than 5 mm Hg, bringing the gaseous mixture into contact with a diaphragm made of Pd, or its alloys, to diffuse H2 through it, and maintaining the partial pressure of the diffused H2 less than that of the H2 in the gaseous mixture.
Colour Photographic Materials
fuji photo film co. British Patent 1,428,296
Pt group metals and Au may be used to sensitise a colour photographic material which includes a light sensitive silver halide emulsion layer containing a coupler having in its molecule an aryloxyalkoxycarbonyl arylene group, such as β-(2,4-di-tert-butylphenoxy)ethoxycarbonyl.
Recovering Osmium from Glycol Solutions
atlantic richfield co. U.S. Patent 3,927,168
Ozone is passed through the crude oxidation reaction mixture obtained during the Os catalysed oxidation of an organic compound, e.g. an olefin, to recover Os by distillation from the reaction product, e.g. glycol, and avoid the formation of insoluble deposits, principally OsO2.
Refining Platinum Group Metals
matthey rustenburg refiners (proprietary)
ltd. French Appl. 2,264,880
A particulate mineral concentrate is contacted with a gas containing a halogen at a temperature sufficiently high for the non-noble metals and Ag to be transformed into halides which are separated from the concentrate by volatilisation, then the volatilised halides are separated from the solid mixture containing the remaining precious metals.
ELECTRICAL AND ELECTRONIC ENGINEERING
Clad Wire Electric Conductors
matsushita electric industrial co. ltd. British Patent 1,432,906
The conductors are made by providing a strip including at least a base metal and at least a surface layer of a noble metal chosen from Au, Ag, Pt, Pd (alloys) bonded to the base metal, forming the strip into a transversely arcuate form with the noble metal on the convex surface and drawing the strip through a die.
Nickel Oxide Metallisation
e. i. du pont de nemours & co. U.S. Patent 3,922,387
Electrical conductors on a ceramic substrate consist of finely divided powders of noble metals and 0.1−10% nickel oxide. The noble metal is selected from Pd, Pt, Au and Ag, preferably Pd-Ag and the conductors are metallised on dielectric substrates.
Dry Plasma Process for Etching Noble Metal
international plasma corp. U.S. Patent 3,923,568
An electrically conductive pattern is produced on an electrically non-conductive substrate by forming a film of electrically conductive Au, Pt, Pd or Ag on the substrate, providing a film of resist over the film of noble metal covering those areas where the noble metal is to remain, and contacting the exposed noble metal with a plasma consisting essentially of F2, Cl2 and not more than 25% O2 by volume for a time sufficient to remove the exposed noble metal.
Platinum Oxide Lithographic Masks
bell telephone laboratories inc. U.S. Patent 3,925,677
A lithographic mask consisting of a rigid transparent substrate and a selectively applied pattern of thin Pt oxide formed on the substrate, the pattern having microscopic features suitable for microcircuit lithography, is described.
Solid Sensor Electrode
owens-illinois inc. U.S. Patent 3,929,609
A noble metal, particularly a Au, Ag, Pt or Pd (mixture)-glass composite, is screen printed on an inert substrate such as low alkali glass and fired to provide a solid sensor electrode.
Palladium Alloy for Relay Contacts
Thermosensor for I.C.E. Conversion Catalysts
nippon tokushu togyo k.k. British Patent 1,428,267
A thermosensor for use in an I.C.E. exhaust purifier consists of a thermally sensitive element with a pair of lead wires connected to it, a ceramic tube with two lengthwise holes, a ceramic coating surrounding the element, and a catalyst layer to promote oxidation of the unburnt components of the exhaust gas deposited on the ceramic coating. The electrodes in the tube holes are of Pt wire and/or a Pt-Rh alloy wire, and the catalyst is Pt.
Chemotherapeutic Agents for Cancer (Cyclo-propylamines)
rustenburg platinum mines ltd. British Patent 1,432,562
A cis coordination compound of platinum for the treatment of cancer has the formula (A)-(B)-Pt-(X)-(Y) in which (X) and (Y) are the same or different and are halogen or pseudohalogen and (A) and (B) are the same or different alicyclic amines coordinated to the Pt through their N atoms. Each amine itself has the general formula cyclo-CnR2n−1NH2, in which n is 3–7 and the R ’ s are the same or different and are preferably H, lower alkyls or solubilising groups, for example sulphonic or carboxylic acid or their salts.
Palladium Alloys for Ceramic Bonding
j. m. ney co. U.S. Patent 3,928,913
A dental casting alloy consists of 40−60% Pd or mixtures of Pd with 12−25% Pt, 20−59% of a base metal component selected from 20−50% Co and Co-Ni mixtures and a modifier selected from 1−8% In, 1−3% Sn and 1−8% of mixtures of Sn and In where the Sn does not exceed 3%, also optionally, 0−5% Zn, 0−5% Fe, 0−5% W, 0−2% Ru, 0−2% Rh and 0−10% Mo.