NEW PATENTS: January 1978
Journal Archive
NEW PATENTS: January 1978
METALS AND ALLOYS
CHEMICAL COMPOUNDS
Platinum or Silver Hydroxymercaptan Salts
american cyanamid co. U.S. Patent 4,018,807
Certain metal salts, such as the Pt and Ag salts of aromatic o–hydroxymercaptans, are prepared by the reaction of an aromatic o–hydroxythiocyanate with a water-soluble salt of the metal in the presence of a strong mineral acid. The salts can be incorporated into plastic lenses to afford eye protection against laser radiation.
ELECTRODEPOSITION AND SURFACE COATINGS
Platinum Coating for Electrodes
exxon research & engineering co. British Patent 1,484,645
A photogalvanic device has a thin layer of Pt on a glass surface for use as an electrode.
Platinum Group Metals for Bipolar Press Cell
b.a.s.f. wyandotte corp. British Patent 1,487,237
In the cell, a connection between the anode and cathode can be made of a Pd-Ti alloy and the anode may be coated with one or more Pt group metals or their oxides.
LABORATORY APPARATUS AND TECHNIQUE
Dissolved Oxygen Probes
fischer and porter co. British Patent 1,483,987
A probe for continuously measuring the concentration of O2 dissolved in a liquid has a Pt or Au measuring electrode.
Noble Metal Electrode for Electrochemical Gas Sensor
general electric co. U.S. Patent 4,025,412
The electrode, for the sensor, is made of a noble metal alloy, such as Pt-Ir and is used in association with a Pd foil.
HETEROGENEOUS CATALYSIS
Ruthenium Containing Perovskites
johnson matthey & co. ltd. British Patent 1,482,516
A catalyst comprises BaRuO3, CaRuO3, SrRuO3 or MgO/RuO2 together with Pt in free elemental or oxide form, and is used for the purification of I.C.E. exhaust.
Catalytic Destruction of Chlorinated Hydrocarbons
national research & development corp. British Patent 1,485,375
A fuel which is H2 and a hydrocarbon is flamelessly burned in a bed of catalyst comprising metallic Rh, Pd, Ir or Pt or compounds thereof and the chlorinated hydrocarbon is passed into the catalyst bed in which the fuel is burning.
Selective Hydrogenation Catalyst
johnson matthey & co. ltd. British Patent 1,487,915
Catalysts for the hydrogenation of nitric oxide to hydroxylamine comprise a support and a catalytic material consisting of one or more of the elements Ir, Ni, Ag and Au, one of the elements Ru, Rh, Pd, Os and Pt, and Si.
Catalytic Tube for Methanation
institut nawozow sztucznych U.S. Patent 4,019,969
Catalytic tubes for methanation and steam reforming of hydrocarbons have wall supported catalysts chosen from Ru, Ir, Os, Pt, Pd, Fe, Mo, Ag, Co, Th and Ni.
Rhodium and Ruthenium Catalyst for Treating Exhaust Gases
u.o.p. inc. U.S. Patent 4,020,013
A composite consists of a high surface area refractory inorganic oxide containing Rh and Ru impregnated onto it in a weight ratio of 1:1 to 2:1. The Rh makes up 0.02−0.10% by weight of the composite.
Group VIII Multimetal Catalyst
u.o.p. inc. U.S. Patent 4,024,199
Alkylaromatic hydrocarbons are isomerised using a catalyst which consists of a porous alumina carrier bearing 0.01−2.0% Pt or Pd, 0.01−2.0% Rh, 0.01−5.0% Sn and 0.1−10.0% halogen.
Palladium Hydrogenation Catalyst
exxon research & engineering co. U.S. Patent 4,025,459
The addition of liquid HF or liquid Bronstead acids containing F to Pd, Pt or Ir gives a catalyst which shows a hydrogenation activity which is enhanced by 10–144 times. The addition of a F-containing Lewis acid to the HF or acid can increase the hydrogenation by up to 3500 times as much.
Platinum or Rhodium Isotope Exchange Catalyst
atomic energy of canada ltd. U.S. Patent 4,025,560
Hydrogen isotopes are exchanged between streams of gaseous H2 and liquid H2O by contacting them with a catalyst at 0−300°C. The catalyst consists of a hydrophobic material, such as PTFE, and an active metal such as Pt or Rh.
Platinum and Palladium Oxidising Catalysts
air products and chemicals inc. U.S. Patent 4,025,605
Low concentrations of oxidisable organic contaminants are removed from O2 containing inert gases by an absorption process which uses a Pt and/or Pd metal or complex oxidising catalyst.
Catalytic Oxidation Process
johnson matthey & co. ltd. U.S. Patent 4,025,606
A process for the oxidation of CO or hydrocarbons and uncombined O2 to CO2 and water uses a catalyst which consists of an inert support coated with an intermediate layer of Sc, Y and/or a lanthanide oxide and a catalytically active surface coating of an alloy chosen from Pt-Rh-base metal alloys which contain 1−50% Rh, 0.01−25.0% base metal and the rest Pt. The base metal used may be Ag.
Palladium Ruthenium Alloy Catalyst
v.m.gryanznov et al. U.S. Patent 4,026,958
An alloy of 90−98% Pd and 2−10% Ru is used as catalyst for the dehydrogenation of hydrocarbons such as cyclohexane.
Fluoriding Noble Metal Catalysts
shell oil co. U.S. Patent 4,032,474
Catalysts in a fixed bed, including noble metal catalysts, especially Pd and Pt, are fluorided in situ by providing an amount of F which is in excess by at least 10% of the amount of F absorbed by the catalyst.
Platinum Group Catalyst for Hydrocracking Processes
phillips petroleum co. U.S. Patent 4,035,283
The catalyst consists of alumina supported Pt, Ir, Os, Ru, Rh or Pd metal activated at high temperature by a gas consisting of a H halide, a halosilane and an organic halide.
Platinum Group Catalyst for the Direct Oxidation of Olefins
agence nationale de valorisation de la recherche French Appl. 2,310,987
The direct oxidation of 3−30C olefins is carried out in a single stage process using at least two metal catalysts: the first is an Os, Rh, Ir, Ni, Ru or Co compound and the second is a Mo, W, V, Ti, Nb or Cr compound.
Platinum-containing Isomerisation Catalyst
cie. francaise de raffinage French Appl. 2,320,775
A catalyst for hydrocarbon isomerisation reactions consists of a refractory support, a metallic halide component, a Pt group metal, especially Pt, and at least one of Ti, Zr, W and Mo.
CHEMICAL TECHNOLOGY
Rejuvenation of Platinum Catalysts
inventa a.g. für forschung und patentverwertung British Patent 1,480,154
The aged catalyst is treated in an acid medium in the presence of a hydroxylamine salt with a S compound which releases H2SO3, and subsequently treating it in an acid medium, in the presence of H2, with an aqueous solution of a Pt4+ or Pt2+ compound.
Separating and/or Purifying Secondary Platinum Group Metals
swarsab mining, exploration and development co. (pty) ltd. British Patent 1,481,385
Rh, Ru, Ir and Os are separated from a concentrate by heating the concentrate in a stream of O2.
P.G.M. Recovery from Catalysts
johnson matthey & co. ltd. British Patent 1,486,413
Pt group metals are recovered from supports by mechanical reduction of the catalyst to give a fines portion and a tails portion, the majority of the metallic value being in the fines portion, and then separation of the portions.
Treating Plastic Substrates prior to Plating
oxy metal industries corp. British Patent 1,487,243
Plastic substrates may be activated by contact with an acidic Sn/Pd complex, and then accelerated by the use of a solution of a Pt group metal salt.
High-temperature Resistant Metal Powders
johnson matthey & co. ltd. French Appl. 2,316,029
The powders consist of refractory particles coated with a layer of Pt, Pd, Rh, Ru, Ir, Os, Au, Ag or their alloys.
Cermets
johnson matthey & co. ltd. German Offen. 2,658,647
A major proportion of the surface of a finely divided refractory ceramic oxide, carbide or nitride is coated with an additive containing Y, Al, Ti, V, Cr or Ni which will act as a binding agent for a chemically deposited metal which is Pt Ag, Ru, Rh, Pd, Os, Ir, Au or their alloys.
GLASS TECHNOLOGY
Vitrified Ceramic Product Containing Platinum Group Metals
gesellschaft für kemforschung g.m.b.h. French Appl. 2,319,593
The products, for use in the elimination of radioactive residues, consist of a matrix which contains a borosilicate glass, a nucleating agent, some metal fluorides and finely divided precious metals such as Ru, Rh or Pd.
ELECTRICAL AND ELECTRONIC ENGINEERING
Electrical Resistor
hoechst a.g. British Patent 1,478,919
A resistor comprises a sheet of electrically resistive open-meshed fabric having as a terminal a metallic contact strip, such as a Pt group metal, Au, or Ag, covering a part of one of its surfaces.
Bonding a Semiconductor Device to an Electrical Conductor on a Supporting Substrate
international business machines corp. British Patent 1,481,015
The device is placed on the substrate with a solder pad formed on the device in contact with the electrical conductor. The solder pad is heated to cause solder reflow and the formation of a ternary intermetallic including Pd dispersed within the solder.
Multisubstrate Interconnected Printed Circuit Module
westinghouse electric corp. British Patent 1,481,590
Pt-Au or Pd-Ag screen printed pastes and Sn-Pb-Ag solder are used in interlayer connecting means for multisubstrate interconnected printed circuit modules which can be quickly and easily disassembled.
Platinum-layer in Resistance Structure
w.c.heraeus g.m.b.h. U.S. Patent 4,028,657
A thermometric resistance structure has a layer of Pt applied in a resistor pattern configuration on the intermediate lanthanide, Ti or Fe oxide or oxides of an alumina ceramic structure.
TEMPERATURE MEASUREMENT
MEDICAL USES
Platinum Ceramic Dental Alloy
national research & development corp. British Patent 1,483,362
An alloy for dental restoration work is prepared by firing porcelain on to a noble metal substrate, specifically Pt, which is carrying an intermediate adherent layer of a metal oxide, such as Sn or In oxide.
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