NEW PATENTS: April 1978
NEW PATENTS: April 1978
METALS AND ALLOYS
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).
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.
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.
LABORATORY APPARATUS AND TECHNIQUE
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.