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Platinum Metals Rev., 1963, 7, (2), 79

NEW PATENTS: April 1963

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Fuel Cells


the electric storage battery co. British Patent 910,495

An electrode for a fuel cell comprises a porous matrix of which at least the pore surfaces consist of an alloy of 1-47% nickel, 50-96% silver and balance palladium. Stated to give a high efficiency of conversion into electricity.

11 β-Methyl-5α-Steroids


the british drug houses ltd. British Patent 912,038.

A platinum or palladium catalyst is used in the preparation of 11β-methyl-5α-steroids by reacting a solution in an inert solvent of the corresponding 11β-methylene-5α-steroid with hydrogen in the presence of the catalyst.

Anode for Electrolytic Production of Chlorine


farbwerke hoechst a.g. British Patent 912,194

An anode for use in the production of chlorine by electrolysis of aqueous solutions of alkali metal chlorides or hydrochloric acid is formed of a base of niobium, or an alloy thereof, on which is a thin coating of one or more platinum group metals. Iridium or iridium-platinum are preferred.

Selective Hydrogenation Catalysts


the dow chemical co. British Patent 912,444

A catalyst (suitable for the selective hydrogenation of acetylene and substituted acetylenes in the presence of di- and mono-olefins, acetylene and diolefins in the presence of mono-olefins, and diolefins in the presence of mono-olefins) is composed of a high surface area activated alumina on which is finely dispersed metallic copper activated by ruthenium, rhodium, palladium, iridium or platinum.

Catalyst Composition


american cyanamid co. British Patent 913,449

A catalyst for oxidising hydrocarbon combustion exhaust gases is composed of a major portion of alumina, 3-30% of vanadium pentoxide, 0.001-10% of a platinum group metal (platinum or palladium) and/or 0.1-10% of a catalytically active stable copper compound, e.g. copper oxide.

Production of Formaldehyde


huttenwerk oberhausen a. g, British Patent 913, 581

In the production of formaldehyde by oxidising methane and/or homologous gaseous paraffin hydrocarbons with oxygen in the presence of a catalyst, the gaseous mixture is passed through a porous fixed bed of catalyst, e.g. pumice, and then through a metal mesh adjacent to the bed and formed of platinum or iridium or an alloy thereof, e.g. 95% platinum and 5% iridium.

Fuel Cell Electrodes


imperial chemical industries ltd. British Patent 913,592

A fuel cell has gas-permeable electrodes, one or more of which has a surface of titanium on which is deposited a platinum group metal.

Fabrication of Ruthenium


the international nickel co. (mond) ltd. British Patent 913,876

Ruthenium is fabricated by compacting ruthenium powder having a surface area of 2-10 m2/g under a pressure so correlated with the surface area and the sintering temperature that, after sintering, the density is greater than 90% of the theoretical density of solid ruthenium.

Cyclopropylamines


abbott laboratories ltd. British Patent 913,898

N-benzylcyclopropylamine is prepared by hydrogenating N-benzylidenecyclopropylamine in a solvent at room temperature in the presence of a palladium catalyst.

Hydrogenation of Olefinic Compounds


engelhard industries inc. British Patent 915,033

A ruthenium catalyst is used in the selective hydrogenation of an olefinic compound containing a vinyl group in admixture with an olefinic compound not containing a vinyl group.

Production of Ruthenium Compounds


the international nickel co. (mond) ltd. British Patent 915,785

Ruthenium dioxide monohydrate is claimed as a new compound. It is made by reaction of ruthenium tetroxide with hydrogen at below 50°C and pressure of not over 100 p.s.i.g. The compound may be used as a catalyst on an inert carrier in the decomposition of concentrated hydrogen peroxide.

Palladium Catalysts


imperial chemical industries ltd. British Patent 916,056

A catalyst suitable for mild hydrogenation reactions, e.g. selective hydrogenation of acetylenes in the presence of olefins, is formed of palladium supported on alumina, the pores of which have a mean radius of at least 200 Angstrom units, preferably 200-1400Å. Palladium content=0.01-0.40% by wt. Method of manufacture includes heating active alumina at 940°-1200°C. Gamma alumina and palladium nitrate are used.

Hydrogenation of Acetylenes


imperial chemical industries ltd. British Patent 916,057

Covers the use of the catalyst of No. 916,056 in the hydrogenation of acetylenes.

Hydrogenation of Unsaturated Aldehydes


engelhard industries inc. British Patent 916,119

The olefinic bond of an α-, β-unsaturated aldehyde or ketone is selectively hydrogenated to the corresponding saturated bond by reacting the aldehyde or ketone with hydrogen in the presence of a rhodium and /or ruthenium catalyst. Supported rhodium metal or ruthenium metal is used.

Purification of Nitric Oxide


engelhard industries inc. British Patent 916,693

Nitrogen dioxide and oxygen are selectively removed from a gaseous mixture containing them and nitric oxide by contacting a mixture of hydrogen, carbon monoxide or a gaseous hydrocarbon and the gaseous mixture with a platinum group metal catalyst at reaction temperature. Platinum, palladium, ruthenium or rhodium are preferred.

Electrical Contact Materials


siemens & halske a. g. German Patent 1,134,520

Alloys of 20-70% gold and balance iridium and/ or rhodium, produced by powder metallurgical techniques, are used for the operative parts of electrical contacts.

Rupture Disc


engelhard industries inc. U.S. Patent 3,057,718

A rupture disc in a safety device is formed of an alloy of 99.0-99.9% platinum and at least two of gold, manganese, copper, iron, nickel, calcium, silver, lead, tin, zinc, boron, aluminium, magnesium, chromium, antimony, iridium, palladium, rhodium and ruthenium. One of these metals is present to the extent of 0.1% to less than 1%.

Cyclopentadiene Polymers


velsicol chemical corp. U.S. Patent 3,062,800

Hydrogenated cyclopentadiene polymer is made by hydrogenating a benzene-soluble catalytic homopolymer of cyclopentadiene having 1,4 linkages with hydrogen in the presence of palladium catalyst at above 25°C until at least 60% of the initial polycyclopentadiene reactant has been hydrogenated.

Fuel Cell Electrode


the electric storage battery co. U.S. Patent 3,062,902

A fuel cell electrode is formed of a porous matrix the pore surfaces at least of which consist of an alloy of 1-47% nickel, 50-90% silver and 3-15% palladium, all by wt.

Alloys


union carbide corp. U.S. Patent 3,063,835

A corrosion-resistant alloy is formed of 0.005-5% by wt. in all of at least one platinum group metal and/or rhenium and balance titanium.

Method of Coating Metal


engelhard industries inc. U.S. Patent 3,066,042

A body of molybdenum, tungsten, tantalum or titanium is coated by spraying a molten platinum group metal onto the surface as a thin coating, shot peening the coating and heat-treating it at 600°-1400°C to promote solid diffusion of the coating. These steps are repeated until a sufficiently thick platinum metal coating is obtained.

Thermocouples


engelhard industries inc. U.S. Patent 3,066,177

The positive element of a thermocouple consists of 3-15% gold, 55-83% palladium and 14-34% platinum, and the negative element of 60-65% gold and 35-40% palladium.

Brazing Alloy


westinghouse electric corp. U.S . Patent 3,070,875

A filler metal composed, by wt., of 30-50% of nickel, up to 3.5% of silicon and/or beryllium and balance palladium is used for brazing stainless steel members.

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