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Journal Archive

Platinum Metals Rev., 1978, 22, (2), 73

NEW PATENTS: April 1978

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METALS AND ALLOYS

Hydrogen-Diffusion Alloy

europaische atomgemeinschaft (euratom) German Offen. 2,719,807

A membrane for separation of hydrogen from HI and I is an alloy of Pd with 5−23% Sn and/or 2−7% Si.

ELECTROCHEMISTRY

Electrochemical Cell

national research development corp. British Patent 1,496,660

Pt gauze distributors are used in an electrochemical cell in which cathode and anode are provided by a fluidised bed of C particles.

Oxidative Purification of Aqueous Effluents

westinghouse electric corp. British Patent 1,498,355

Waters containing small amounts of phenol are purified by electrolytic oxidation using electrodes of Pt/C or RuO2.

Oxygen Generation Catalyst

general electric co. U.S. Patent 4,039,409

Oxygen is generated electrolytically on a catalytic anode consisting of a Pt-Ru alloy comprising reduced oxides of Pt and 5−60% Ru.

Platinum Coated Anode

g. thiele et al U.S. Patent 4,042,484

A protective cover layer for electrolytic metal anodes, for use in the production of chlorine and sodium hydroxide is of formula MnPt3O4 (M is Li, Na, K, Ag or Cu, n is 0.4–0.6).

Colloidal Platinum

prototech co. U.S. Patent 4,044,193

Very fine particulate colloidal Pt, of the 15−25Å size range, with catalytic activity, for use in fuel cell catalytic electrodes is reported.

Ion Sensitive Electrode

national research development corp. U.S. Patent 4,052,285

The electrodes may contain ion-sensitive glass particles, the composition of which may include La2O3 and/or PtO3 and Y2O3 and also contain a conductive member which may be of Pt.

ELECTRODEPOSITION AND SURFACE COATINGS

Turbine Blade Coating

gesellschaft für kernforschung m.b.H. British Patent 1,495,626

Turbine blades have a core of highly heat-resistant alloy, and an outer coating of a highly heat-resistant, non-porous, corrosion-resistant metal, such as Rh, Ir or Pt.

Gold-Palladium Alloy Electrodeposition

oxy metal industries corp. U.S. Patent 4,048,023

Pd-Au alloys are electrodeposited from a bath containing 1–50 g/l Au as a Group IA Au sulphite and 0.05–10 g/l Pd in the form of palladosamine chloride, at pH 5.5–11.0.

Iridium Coating Composition for Electrodes

solvay & cie. U.S. Patent 4,049,532

An electrode for use in electrochemical cells is formed of Ti or its alloy coated with composition containing a heat-decomposable Ir compound.

Iridium Plating

g. a. vartanova et al Russian Patent 531,896

An Ir electroplating solution contains per litre, 2–4 g potassium hexachloroiridate, 24–60 g potassium bisulphate, 6–15 g potassium chloride and 10–12 g potassium hydroxide.

LABORATORY APPARATUS AND TECHNIQUE

Platinum Group Metal Catalyst for Methane Detector

r.s.e. corp. U.S. Patent 4,045,177

The detector has a Wheatstone bridge circuit which has a refractory-coated detector element with an oxidation catalyst on it. This catalyst is Pt and/or Pd black.

HETEROGENEOUS CATALYSIS

I.C.E. Exhaust Oxidation/Reduction Catalysts

e.i. du pont de nemours & co. British Patents 1,489,785–6

The catalysts comprise mixed metal oxides having the perovskite structure and containing a Pt-group metal such as [SrxLa1−x][Co1−yRuy]O3 or [SrxLa1−x][Co1−yPty]O3.

Oxidation Catalysts

imperial chemical industries ltd. British Patent 1,491,205

Catalysts for flameless heaters are synthetic metal oxide polycrystalline fibres supporting Pt, Pd and/or Rh.

I.C.E. Exhaust Gas Purification Catalyst

u.k. atomic energy authority British Patent 1,491,445

The catalyst is a channelled strip of Al-bearing ferritic steel, at least partly coated with Al2O3, on which is deposited a catalyst which is selected from Pt, Pd, Ir, Rh and their alloys.

Metallic Substrates Catalysts

johnson matthey & co. ltd. British Patent 1,492,929

Catalysts for oxidation of NH3 in HNO3 manufacture, flameless combustion of hydrocarbon fuels and purification of automobile exhaust gases consist of a heat- and oxidation-resistant Fe-base alloy substrate coated with a refractory oxide and then with a catalytically active material selected from one or more of Ru, Rh, Pd, Ir, Pt, Au, Ag and their alloys, optionally with base metals.

Oxidation Catalysts

imperial chemical industries ltd. British Patent 1,497,414

Olefinic diamines, useful in the manufacture of nylon, are obtained by reaction of olefins with hydrogen cynanide and oxygen in the presence of a carboxylic acid and Pt or preferably Pd, optionally promoted with Cu, Sn or Fe.

Platinum Group Metal Catalyst for Halogenated Hydrocarbons Production

exxon research & engineering co. U.S. Patent 4,041,091

Halogenated hydrocarbons are selectively prepared from H2, CO and a halogen over a supported catalyst of Pt-Re, Pt-Ir, Pt, Ir or Re.

Platinum-Tin Promoted Zinc Aluminate Catalyst Reactor

phillips petroleum co. U.S. Patent 4,041,099

An improved Pt-Sn promoted Zn aluminate catalyst reactor for dehydrogenation of hydrocarbons is described.

Light Sensitive Palladium Complex Catalysts

eastman kodak co. U.S. Patent 4,042,392

Formazan dye images are prepared by the reduction of tetrazolium salts using as catalyst a Group VIII, specifically Pd complex catalyst.

Platinum Group Metal Catalyst for Upgrading Hydrocarbons

texaco inc. U.S. Patent 4,042,490

Mixtures of 6−30C n-paraffins and byproducts are converted to pure n-paraffins by hydrogenation using a catalyst system of Al2O3, 0.1−5.0% Group VIII metal, specifically Pt, Pd, Rh, Ru, Ni or Co and 0.05−2.0% Group IA, IIA and/or Tl(I) oxide.

Trimetallic Platinum Group Metal-Containing Catalyst

u.o.p, inc. U.S. Patent 4,048,099

A catalyst for the conversion of hydrocarbons contains 0.01−2.0% Pt group metal, 0.01−5.0% Group IVA metal, 0.01−3.0% Group VIB transition metal and 0.1−3.5% halogen.

Platinum Catalyst

ste. lyonnaise des applications catalytics s.a. U.S. Patent 4,048,113

A catalyst mass for the oxidation of NH4 consists of a sheet of Al2O3 fibres coated with a Pt catalyst and contacted with a layer of mineral wool.

Platinum-Ruthenium Reforming Catalyst

moore-mccormack energy inc. U.S. Patent 4,053,388

A process for obtaining a high yield of aromatics from naphtha, by integrating a catalytic reformer and a thermal hydrocracking unit, followed by fractionating the product stream to give the desired aromatic, uses Pt–Ru as the reforming catalyst.

Rhodium- and Platinum-Containing Catalyst

johnson matthey & co. ltd. U.S. Patent 4,053,556

In a process for the reduction of an oxide of N with a reducing fuel or the oxidation of an organic compound in a gas containing oxygen, a catalyst is used which consists of an inert rigid porous refractory honeycomb structure having a first coating containing at least one of the oxides of Ti, Zr, Hf and Th and preferably at least 50% by weight Al2O3 and a second coating of an alloy of Rh 1−50 wt.%, base metal 0.01−25 wt.% and balance Pt.

Cation-Exchanged Carbon Catalysts

stamicarbon b.v. Dutch Appl. 76.04669

Improved hydrogenation, oxidation and reforming catalysts are obtained by using a C support which is oxidised to introduce acidic groups, reduced and then cation-exchanged with Ir, Os, Pd, Pt, Rh, Ru, Ag, Au, Co, Cu, Fe, Ni and/or Zn compounds or complexes.

HOMOGENEOUS CATALYSIS

Olefin Hydroformylation Catalyst

e.i. du pont de nemours & co. British Patent 1,491,134

The hydroformylation catalyst has the formula LnMH+X where n is 2–4, M is Ni, Pd or Pt, L is a trivalent organophosphorus ligand and X is an anion, such as hydridotris (triethyl phosphine)Pt(II)hexafluorophosphate.

Rhodium Hydroformylation Catalyst

b.a.s.f. a.g. British Patent 1,495,595

1,6-Hexanediol is obtained by hydroformylation of butadiene in the presence of a catalyst which is a Rh carbonyl complex with a tertiary phosphine or phosphite.

CHEMICAL TECHNOLOGY

Oxidative Catalyst Recovery

johnson matthey & co. ltd. British Patent 1,493,933

A coked C-supported Group VIII noble metal catalyst, or Ag-containing photographic film, is heated in an aqueous medium under pressure in an oxidising atmosphere to destroy the support along with the coke deposit, the catalytic metal or Ag catalysing the oxidation reaction.

Palladium-Tobacco Composition

liggett & myers inc. British Patent 1,493,971

The concentration of polycyclic aromatic hydrocarbons in tobacco smoke is reduced by incorporation of 0.001−1% of Pd in the tobacco.

Amine Extraction of P.G.M.s

matthey rustenburg refiners (pty.) ltd. British Patent 1,495,931

An acidic aqueous solution containing salts of Pt, Rh and Ir is treated with a reducing agent to convert Ir(IV) to Ir(III), and Pt is extracted with a secondary or tertiary amine or quaternary ammonium compound. The residual aqueous solution is then treated with an oxidising agent, and the tetravalent Ir so produced extracted with a further quantity of secondary or tertiary amine or quaternary ammonium compound.

Amine Extraction of P.G.M.s (Oxidised Route)

matthey rustenburg refiners (pty.) ltd. British Patent 1,497,534

An oxidised acidic solution containing salts of Pt, Rh and Ir, is treated with an organic nitrogen compound, preferably a tertiary amine, to extract Pt and Ir, leaving the Rh in the aqueous phase. The Pt and Ir are then re-extracted into an aqueous medium, and separated by reduction of the Ir salt.

Solvent Extraction of Palladium

matthey rustenburg refiners (pty.) ltd. British Patent 1,497,535

Pd is extracted from acidic aqueous solutions containing other Group VIII noble metals and small amounts of base metals with a water-immiscible solution of a hydroxy oxime.

High-Temperature Antifriction Material

ordena trudovogo krasnogo znameni institut problem materialovedeniya an ukr. s.s.r. Russian Patent 633,653

The composition is Co containing 10−20% solid lubricant (MoS2) and 5−15% Pd.

GLASS TECHNOLOGY

Furnace Orifices

johns-manville corp. British Patent 1,489,845

A glass-melting furnace has two successive outlet orifices, the outermost of which is made from Pt, Pd, Rh, or alloys thereof.

Glass Manufacture

p.p.g. industries inc. British Patent 1,498,274

In an apparatus for the manufacture of continuous sheet flat glass, the threshold may be of Pt.

ELECTRICAL AND ELECTRONIC ENGINEERING

Platinum Metallisation Pattern

bell telephone laboratories inc. U.S. Patent 4,039,698

A Pt compound whose heat of formation is −100 to +10 kcal/mol is deposited in a pattern on a substrate and the compound reduced to metal. Suitable compounds are Pt oxide, chloride, bromide and iodide.

Platinum Group Isolating Material for Diamond Production

general electric co. U.S. Patent 4,042,673

A layer of Pt, Ir, Os, Rh, Pd and Ru is used as an isolating material in the production of boron-containing diamond crystals.

Platinum Silicide Fuse Links

advanced micro devices inc. U.S. Patent 4,042,950

Selected circuit elements and interconnections of an integrated circuit device are connected by Pt silicide fuse links which open when electrical power exceeds a threshold amount.

Platinum Resistance Layer for Resistor

w. c. heraeus g.m.b.h U.S. Patent 4,050,052

An electrical temperature measuring resistor structure, especially for resistance thermometers, has a strip of Pt contained in it.

Gold Microwire Production

veb mansfeld-kombinat “wilhelm pieck” East German Patent 126,559

Very pure Au is doped with Fe and Y, Ir, Pd and/or Zr to give a material suitable for very fine wires.

Alloy for Electrical Contacts

vsesoyuznyi nauchno-issledovatel’skii institut gosnaka Russian Patent 548,649

A contact alloy of good mechanical strength contains 10−15% Pd, 0.01−2% Mn, 0.1−3% Zn, 0.1−5% Sn, 3−6% Ni and the remainder Ag.

TEMPERATURE MEASUREMENT

Differential Thermal Probe

johnson matthey & co. ltd. British Patent 1,490,066

Apparatus for detecting compositional changes in a gas stream includes one or two “Thermafilm” devices, one of which is in contact with a catalytic layer, and means for measuring the temperature change of the one device or the temperature difference between the two, the temperature changes indicating changes in the composition of the gas stream.

Resistance Thermometer

w. c. heraeus g.m.b.h. German Offen. 2,615,473

The probe of a high-temperature resistance thermometer is a refractory support, coated with Pt and protected with a glaze containing particles of Au.

MEDICAL USES

Hydrogenation Catalysts

dr. karl thomae g.m.b.h. British Patent 1,497,857

Pd, Pt, Rh, Ru and/or their compounds may be used as hydrogenation catalysts at various stages in the synthesis of arylaliphatic ketones and secondary alcohols useful as anti-tumour agents.

Platinum Complex for Cancer Treatment

rustenburg platinum mines ltd. Dutch Appl. 77.01909

New cancer treatment agents are Pt halide complexes of one or two branched aliphatic amines, such as cis -bis(2-amino-5-methyl-hexane) dichloro-trans-dihydroxy-platinum(IV).

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