Platinum Metals Rev., 1967, 11, (4), 159
NEW PATENTS: October 1967
METALS AND ALLOYS
Heat Treatment of Platinum-Cobalt Magnets
international nickel ltd. British Patent 1,067,054
Remarkable magnetic properties can be produced in pure alloys containing 19.8−31.2% Co by subjecting them to a disordering treatment at a temperature above 900°C for 30 min to 1 h, cooling to 630−750°C at a rate of 50−150°C/min, cooling to room temperature, ageing at 630−700°C for 5 min − 2 h and then quenching to room temperature.
u.s. atomic energy commission British Patent 1,070,114
The high temperature strength of W can be improved by adding 1.1−12% Ru (based on the weight of the alloy). A preferred composition is 1.1 wt.% Ru and 98.9% W.
Alloys for Strain-Gauge Elements
kabushiki kaisha hitachi seisakusho U.S. Patents 3,305,815–7
In strain gauges the strain element consists of a binary alloy of Os with 90−99% Pt (815), a ternary alloy of 20−60 at.% Pt, 20−60 at.% Pd and 5−30 at.% Ir (816) and a ternary alloy of 15−80 at.% Pt, 15−80 at.% Pd and 2−15 at.% Mo.
Hydrogen Diffusion Tubes
johnson, matthey & co. ltd. U.S. Patent 3,312,043
A closing plug for sealing the open end of Pd or Pd-Ag alloy H2 diffusion tubes consists of material with approximately the same coefficient of thermal expansion and dimensioned to fit tightly with a projecting, threaded spigot of smaller diameter than the tube and used to form a means for attachment of or for stabilising an internal support for the tube. This corresponds to British Patent 1,009,326.
imperial metal industries (kynoch) ltd.
British Patent 1,068,732
An electrode for an electrode boiler, e.g. for boiling H2O, has the parts immersed in the electrolyte (at least) made of Ti or its alloys coated with Ir, Rh, Ir-Pt, Rh-Pt or Ir-Rh-Pt.
Production of Platinum and Palladium Oxides
ELECTRODEPOSITION AND SURFACE COATINGS
Coating Titanium Surfaces
societe d’electro-chimie des acieries electriques d’ugine British Patent 1,069,005
Process for coating Ti or its alloys with a metal of the Pt group. The metal to be coated is acid pickled and the Pt group metal deposited and then heated at 150−300°C.
Applying Designs to Metallic Bases
johnson matthey & co. ltd. French Patent 1,455,917
A decorating composition for application to a noble metal base consists of a metallising paste containing Au, Ag, Pt, Pd or alloys thereof.
Brazing Alloys for Tungsten and Molybdenum
u.s. atomic energy commission U.S. Patent 3,312,539
These metals and their alloys are brazed using alloys of 42−95 wt.% Mo, 5−44 wt.% Rh and up to 45 wt.% Re.
Solder for Soldering Electrovacuum Instruments
Production of Saturated Aldehydes
British Patent 1,065,628
The partial hydrogenation of olefinically substituted aliphatic aldehydes at 70−140°C is catalysed by a mixture of metallic Pd and one or more of Cu, Ni and Co. Au or Ag may also be present.
Silanes, their Quaternary Salts and Polymers
dow corning corp. British Patent 1,066,346
Haloether silanes are obtained by the Pt-catalysed co-reduction of a silane and a hydrocarbon ether.
Production of Araliphatic Dicarbinols
scholven-chemie a.g. British Patent 1,066,401
The corresponding hydrocarbons are oxidised to hydroperoxides and then reduced to dicarbinols using H2 and Pt/Al2O3.
Carbonylation of Olefinically Unsaturated Compounds
badische anilin-& soda-fabrik a.g. British Patent 1,066,772
Carbonylation is catalysed by LmPdXn, where L is an organic phosphine or phosphite, NH3, an amine, a nitrile or an unsaturated hydrocarbon, X is an anion, m is 1–4, n is 1–2 and n+m is 2–6, e.g. Pd(PPh3)3Cl2.
Vinyl Acetate Production
imperial chemical industries ltd. British Patent 1,067,850
The catalyst for the reaction of C2H4 with CH3COOH consists of a redox system and a Pd salt other than the fluoride.
Regeneration and Reactivation of Supported Platinum Group Catalysts
shell internationale research mij. n.v. British Patent 1,069,057
Reforming catalysts are regenerated by treatment with Cl2 or a compound which liberates Cl2 on heating, followed by burning in a gas containing O2 to remove C. The catalyst is then maintained at a temperature higher than burning temperature in a gas of higher O2 content.
esso research & engineering co. British Patent 1,071,467
A crystalline alumino-silicate zeolite composited with a Pt group metal is used for hydrocracking of hydrocarbons.
Production of Finely Divided Catalyst Layers on the Pore-free Surfaces of Hydrogen-absorbing Metallic Bodies
varta a.g. British Patent 1,071,503
A metallic body is coated on one side with a catalyst layer and subjected to H2 pressure, whilst on the other side (e.g. in a tube) a solution of the metal to be used for hydrogenation (e.g. Pd (NO3)2) is precipitated by diffusion of H2 and reduction.
office national industriel de l’azote British Patent 1,072,172
A catalyst comprising 0.1−2.0% Pt, 8−50% Ni and/or Co and an Al2O3 or MgO support. It is used in the methanation of CO by H2 and in the reforming of hydrocarbons.
Hydrocarbon Conversion Process
texaco development corp. British Patent 1,072,620
Mixtures of hydrocarbons (pentone, hexone, etc.) may be converted to highly branched hydrocarbon products by using a chloride-activited Pt/Al2O3 catalyst.
Preparation of Aryl Thiols
united states rubber co. British Patent 1,073,200
PtS2 is used as a catalyst for conversion of aryl sulphinic acids to aryl thiols by hydrogenation. This obviates the use of H2S and S which are needed with prior art processes using base metal sulphides.
esso research & engineering co. British Patent 1,076,215
A highly active catalyst is made by contacting a support with a salt solution of a catalytic metal, reducing the metal ions and subsequently removing the support to leave a finely divided metal. Thus Pt metals, Ag and Au can be deposited singly or in mixtures on CaCO3 which is then removed.
Dehydrogenation of Cyclo-octene
u.s. rubber co. U.S. Patent 3,305,593
1,5-Cyclo-octadiene is produced by heating cyclo-octene and a Rh salt, e.g. RhCl3, in CH3OH, at 50−150°C.
Hydro dealkylation Catalyst
universal oil products co. U.S. Patent 3,306,944
The demethylation of alkyl aromatic hydrocarbons with Rh is catalysed by Rh deposited on an alkali metal-promoted metal oxide support, e.g. Li/Al2O3.
Selective Hydrogenation of Hydrocarbons
mobil oil corp. U.S. Patent 3,309,307
Dienes are selectively hydrogenated in the presence of olefines by using a Pd catalyst in the presence of either CS2 or H2S below the desulphurisation temperature.
Catalytic Hydrogenation of Paraffin Hydrocarbons
universal oil products co. U.S. Patent 3,310,599
A new composite catalyst, e.g. for producing iso-C4H8 from iso-C4H10, 0.01−1.5% Al2O3/Li, 0.05−5% Group VIII metal and sufficient Te, Se or their compounds to give full cracking and isomerisation of the Group VIII metal. Pt and Pd are the preferred noble metals.
Catalyst for Combining Hydrogen and Oxygen in Thorium Slurries
u.s. atomic energy commission U.S. Patent 3,312,526
A catalyst for reversing the radiolytic decomposition of H2O in ThO2 slurries is produced by heating an aqueous ThO2 sol and platinic acid in a Th:Pt ratio of 2−3:1 until a floculated suspension is formed. The suspended solids of platinised ThO2 are recovered and added to ThO2 slurries.
Preparation of Butyrolactone
petro-tex corp. U.S. Patent 3,312,718
Succinic anhydride is hydrogenated to butyrolactone in the presence of a suitable catalyst, e.g. a Pt metal, and silicotungstic acid at 200−300°C and at above 500 psig.
Mono-oxonation Products of Cyclic Dimers and Trimers of Butadiene
chemische werke hüls a.g. U.S. Patent 3,312,742
These butadiene-1,3 dimers and trimers are reacted with CO and H2 in the presence of a catalyst mixture consisting of (a ) Co carbonyls or salts of fatty acids, Pd halides or finely divided Pd and (b ) a Cu chromite, Pt or Ag/Zn/Cr oxide to introduce a formyl group on a double bond.
Production of 4-Halobutene-1
e.i. du pont de nemours & co. U.S. Patent 3,312,747
Commercially valuable 4-chloro- and 4-bromobutene-1 are produced by dehydrohalogenation of 1,3-dihalobutane at 200−385°C in the presence of Pd/Al2O3, Rh/Al2O3, ZnO or activated Al2O3.
Platinum Double Bond Addition Catalyst
general electric co. (new york)
U.S. Patent 3,313,773
The addition of a Si compound, having at least one atom of H attached to the Si atom, to a C–C unsaturated bond is catalysed by trimethyl platinum iodide or diplatinum hexamethyl.
esso research & engineering co. U.S. Patent 3,318,802
The activity of a crystalline SiO2-Al2O3 zeolite containing a Pt group metal is increased by introducing a halogen containing compound into the hydrocracking zone.
Production of Metallic Oxides
johnson, matthey & co. ltd. French Patent 1,458,185
Oxides of Pt, Pd or mixtures of Pt and/or Pd with other metals are produced by electrolysing a molten bath of an alkali metal nitrate and chloride with anodes of the requisite metals.
Oxide Catalysts for Chemical Reactions
johnson, matthey & co. ltd. French Patent 1,458,671
The catalyst is a homogeneous and intimate mixture, not merely a physical mixture, of 20−90% PtO2 and 10−80% RuO2 by weight.
Chemical Reaction Catalyst
French Patent 1,459,643 Italian Patent 748,928
A catalyst for hydrogenation, hydroformylation and carbonylation consists of a platinum metal halide or pseudohalide complexed with an organic isocyanate or a Group VB or VIB compound, e.g. (Ph3P)3RhCl. This corresponds to Canadian Patent 745,663.
johnson, matthey & co. ltd. Dutch Appln. 66.17,004
A general purpose chemical reaction catalyst is an intimate homogeneous mixture of a Pt metal oxide and a baser metal oxide, preferably in a ratio of 3:1 or higher. The base metal may be Fe, Co, Ni, Cu, etc., e.g. a mixture of Ni and Pt oxides. The mixture must not be a simple physical mixture.
johnson, matthey & co. ltd. Italian Patent 743,469
An improved catalyst especially for olefine isomerisation consists of a salt such as RhCl3 or PdCl2 dissolved in a virtually non-volatile hydroxylic compound, e.g. propylene glycol, optionally dissolved on an inert porous support. This corresponds to French Patent 1,445,176.
tokyo shibaura electric co. ltd. British Patent 1,074,561
A H2 electrode consists of a non-porous Pd or Pd alloy plate which is covered with Pd black on the surface exposed to H2, and with black mixture of Pd and Pt on the other surface.
robert bosch g.m.b.h. British Patent 1,074,862
Porous sintered electrodes for fuel cells use Ni as frame metal, and Pt group metal or its Ni alloy as skeleton catalyst in which up to 20% Ti, V, Cr, Co, Mo, Ru or Ta is added.
Hydrogen Fuel Cell Structure
union carbide corp. U.S. Patent 3,307,977
A heavy metal salt of at least one of Fe, Co, Ni, Mn, Cr, Cu, Ag, Au, V, Ti, Th, U and rare earth metals is used with an Al salt to coat a layer of spinel on a porous body (e.g. C). A Pt salt is then used to deposit a catalytic layer.
Fuel Cell Electrode
air products & chemicals inc. and northern natural gas co. U.S. Patent 3,309,231
It has been found that when Pt is used with a Group IB or VIII noble metal in certain proportions, the noble metal acts synergistically to improve the activity of the Pt metal catalyst.
Activation of Electrodes Containing Platinum or Palladium
Process for Bonding Two Temperature-resistant Members
societe nationale d’etude et de construction de moteurs d’aviation British Patent 1,071,179
A bonding layer is interposed between the surfaces of the two members at least one of which is made of graphite. This layer is a refractory material comprising the elements W, Mo, Zr, Hf, Ta, Ti and Ni; either singly or as mixtures and one or more of the Pt group metals.
Production of Pure Hydrogen
ELECTRICAL AND ELECTRONIC ENGINEERING
mullard ltd. British Patent 1,074,284
A semiconductor device is made by alloying Bi and Pt to a semiconductor body consisting of at least two components, none of which is Bi. The amount of Pt is up to 10% of the alloy.
Electrical Resistance Element
cts corp. U.S. Patent 3,304,199
Resistance elements are produced by applying to a non-conducting substrate a mixture of 2−70 wt.% of a finely divided metal oxide selected from RuO2 and IrO2 and 98−30% powdered glass frit.
Impedance Element with Alloy Connector
nytronics inc. U.S. Patent 3,310,718
Strong stable leads to miniaturised impedance components are produced using connectors (such as wire) made from wrought Ag-Pd alloy, particularly alloys with 3−20% Pd.
Iridium Tip Electrode
champion spark plug co. U.S. Patent 3,315,113
A tip electrode, especially for a sparking plug, is made from an Ir wire on which an outwardly extending shoulder is formed by melting the centre of the length of wire and pushing the ends inwards. This avoids mechanical working in which the metal is embrittled.
Platinum Electrical Contacts
international business machines corp. French Patent 1,458,861
Contacts with ohmic properties stable at high temperatures are mixtures of 91−93 wt.% of a Pt group metal and 7−9 wt.% of C. The Pt group metal is suitably Pt.