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Journal Archive

Platinum Metals Rev., 1962, 6, (4), 160

NEW PATENTS: October 1962

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Platinum-alumina Catalyst


american cyanamid co. British Patent 894,412

A platinum-alumina reforming catalyst having improved crush strength retentive properties is made by commingling dried ageing alumina, capable of conversion to eta alumina on calcination, with a platinum compound and aluminium chloride, drying the mixture, forming it into pellets and calcining the pellets. The platinum compound is present in proportion of 0.05-1% of platinum based on dry wt. of catalyst and the aluminium chloride in proportion of 0.25-2.5%.

Fuel Cell


general electric co. British Patent 894,530

A combination electrode structure and electrolyte for a fuel cell is formed of a hydrated ion exchange resin membrane having a gas adsorbing metal electrode embedded in each of the two major surface layers of the membrane. The electrode consists of platinum or palladium adsorbed on activated electrically conductive carbon.

Catalyst


engelhard industries inc. British Patent 894,612

A catalyst is made of platinum, palladium or rhodium supported on an asbestos cloth carrier. Suitable for use in catalytic heaters and purifiers.

Manufacture of Carbonyl Compounds


consortium fur elektrochemische industrie G.m.b.H. British Patent 895,843

Carbonyl compounds are made by treating an organic compound containing one or more carbon-to-carbon double bonds and one or more hetero atoms with an aqueous solution of a platinum group metal compound at 0°-250°C.

Zirconium Alloy


metaixgeseixschaft a.g. British Patent 896,569

An alloy which is highly resistant to corrosion by water and steam at high temperatures and has a low neutron absorption cross-section consists of 0.05-1.5% palladium and remainder zirconium. Minor additions of niobium, iron, chromium, nickel and /or beryllium may be included.

Electrode Structures


imperial chemical industries ltd. British Patent 896,912

An electrode structure is formed of a sheet of anodically polarisable metal, e.g. titanium, tantalum or niobium or their alloys in the form of expanded mesh, to the surface of which is secured a platinum group metal (platinum, rhodium or a Pt-Rh alloy). A busbar is secured along one edge of the sheet.

Electrodeposition of Platinum and Palladium


johnson, matthey – co. ltd. British Patent 897,690

A platinum or palladium plating bath consists of an aqueous solution of a complex nitrito-platinite or nitrito-palladite compound of given general formula. Numerous examples are given, the preferred bath comprising dinitritosulphato platinous (or palladous) acid H2Pt (or Pd) (NO2)2. SO4. Methods of preparation disclosed.

Catalyst for Hydrogen and Oxygen Combination


u.s. atomic energy commission British Patent 897,808

A catalyst for combining hydrogen and oxygen in a thorium oxide slurry is made by forming a thorium oxide sol in an aqueous medium containing 0.05 g (or more) of palladium nitrate per g of thorium oxide and then contacting the sol with gaseous hydrogen until the sol is converted to a flocculated suspension, the resulting suspended solids being recovered.

Platinum Catalysts


american cyanamid co. British Patent 898,395

Platinum-alumina reforming catalysts are made by impregnating aged alumina (constituting 20-80% of the final alumina content of the catalyst) with a halogen-containing compound to add 0.1-0.5% of the compound, mixing this alumina with dry aged and unimpregnated alumina (constituting 80-20% of the final alumina content of the catalyst), commingling this mixture with a solution of a platinum compound sufficient to give 0.05-1 % of platinum in the final catalyst, drying, pelleting and calcining the pellets.

Oxidation of Olefines to Aldehydes, Ketones and Acids


farbwerke hoechst a.g. British Patent 898,790

In the production of aldehydes, ketones and/or acids corresponding to the aldehydes, a hydrocarbon containing an olefinic double bond is contacted in a neutral to acid medium with molecular oxygen and /or an oxidising agent, water and a salt of palladium, iridium, ruthenium, rhodium or platinum in the presence of a redox system.

Catalysts


the british petroleum co.ltd. British Patent 898,972

A catalyst is made by impregnating a refractory oxide containing a platinum group metal with a solution of aluminium halide in an organic water-free solvent, which is subsequently removed. Alumina, aluminium chloride and 0.01-5% by wt. of platinum group metal are used.

Preparation of Cyclo-hexylsulphamic Acid


abbott laboratories British Patent 898,988

Cyclohexylsulphamic acid and salts thereof are prepared by hydrogenating phenylsulphamic acid and its salts in the presence of ruthenium as a catalyst.

Catalyst


engelhard industries inc. British Patent 899,009

A supported ruthenium catalyst is promoted with another platinum group metal, e.g. platinum, rhodium or palladium, the ruthenium content being at least 20 wt.% and up to 95 wt.% of the catalytically active metal. Stated to be advantageous in the hydrogenation of ketones and aldehydes.

Isomerisation of Paraffin Hydrocarbons


the british petroleum co. ltd. British Patent 899,378

A fraction boiling in the range C4-400°F and containing both aromatic and paraffin hydrocarbons is treated to remove most of the aromatics and the aromatic-free fraction is then contacted in the presence of hydrogen with a catalyst comprising an aluminium halide and platinum or palladium on a refractory oxide support to cause the paraffins in the fraction to be converted into paraffins having a higher degree of branching by isomerisation.

Hydrogenation of Acetylenes


imperial chemical industries ltd. British Patent 899,949

Acetylenes are selectively hydrogenated in the presence of olefins by contacting a mixture of at least one acetylene, at least one olefin and hydrogen, sufficient to hydrogenate the acetylenes to olefins, with a catalyst composed of palladium (more than 0.1% but not more than 1%) supported on activated alumina.

Oxidation of Organic Compounds


engelhard industries inc. British Patent 900,107

An olefin, N-alkyl substituted aliphatic amide or cyclic ether is oxidised to, respectively, an aldehyde, ionide or lactone by reacting it with ruthenium tetroxide at a temperature at most not much greater than ambient temperature, e.g. o-20°C, and in a solvent inert to the action of the tetroxide. The solvent may be water, carbon tetrachloride, chloroform or acetone.

Decomposition of 1,1-Dimethymydrazine


engelhard industries inc. British Patent 900,453

Unsymmetrical dimethylhydrazine is decomposed by contacting it with a platinum group metal catalyst, supported on a carrier, such as asbestos.

Combustion Equipment


rolls-royce ltd. British Patent 900,765

A combustion stabilising device for use with combustion equipment for gas turbines is formed of a V-section member disposed in the combustion space, the sides diverging in the direction of gas flow forming a channel open in the downstream direction and a foraminate platinum or platinum alloy catalyst element extending across the channel.

Coating for Metals


compagnie franÇaise thomson-houston British Patent 901,292

A protective coating is formed on oxidisable metals by first electrodepositing a layer of rhodium and then a layer of silver. The thickness of the rhodium layer is such that the diffusion of the silver and the base metal through this layer is negligible even during heating.

Removal of Acetylene from Gases


consortium fÜr elektrochemische industrie g.m.b.h. British Patent 902,136

Acetylene and/or other compounds containing at least one carbon-to-carbon triple bond is/are removed from a gas by catalytically contacting the gas with an oxidising agent, e.g. oxygen, in the presence of a platinum group metal compound, preferably a palladium compound, at 50°-170°C.

Brazing Alloy


general electric co. British Patent 902,521

A high temperature brazing alloy contains 15-40 wt.% chromium, 5-35 wt.% palladium and balance nickel.

Silver Alloy


u.s. atomic energy commission German Patent 1,119,522

A silver alloy having high neutron-absorption and strength properties contains 0.5-1.5% platinum, ruthenium, rhodium, osmium or palladium, 2-20% indium, with, if desired, up to 10% cadmium and balance of not over 85% silver.

Thermoelement Alloy


deutsche gold-und silber-scheideanstalt German Patent 1,119,933

A gold-palladium-vanadium alloy containing 59-68 wt.% gold, 30-39 wt.% palladium and 0.7-2.5 wt.% vanadium is used as the positive limb of a thermoelement.

Gold Alloys


deutsche gold-und silber-scheideanstalt German Patent 1,121,339

Workable gold alloys for electric conductors with high specific resistance, such as potentiometer wires, are made of 1-5% titanium 3-8% iron and remainder gold and palladium.

Method of Making Cyanogen


rohm – haas g.m.b.h. U.S. Patent 3,031,265

Cyanogen is made by contacting hydrogen cyanide at at least 300°C with a platinum group metal catalyst.

Catalyst Manufacture


universal oil products co. U.S. Patent 3,031,419

A catalyst is made by treating a refractory oxide-platinum group metal (in a reduced valence state) composite with a hydrohalide at 500-650°C, then vaporising a Friedel-Crafts metal halide into the composite and heating the latter at above 400°C to remove any unreacted metal halide.

Catalysts


american cyanamid co. U.S. Patent 3,032,512

A platinised alumina catalyst is made by leaching pieces of active alumina by contact with a mixture of nitric acid and hydrochloric acid of sufficient strength to react with alumina until 2-15% thereof is solubilised, washing the pieces with water and then impregnating them with an aqueous solution of chloroplatinic acid.

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