Platinum Metals Rev., 1964, 8, (3), 115
NEW PATENTS: July 1964
Rhodium Trichloride Catalyst
e. i. du pont de nemours & co. British Patent 948,041
An acyclic hydrocarbon diene having 6 or 7 carbon atoms is made by: (1) condensing ethylene or propylene with 1,3-butadiene in presence of a RhCl3 catalyst until the catalyst is deactivated, (2) isolating the catalyst residue, (3) mixing it with 1 mole of aqueous HCl solution per mole of initial catalyst and, (4) using this reactivated residue as a substitute in stage (1).
Preparation of Dicyanogen
rohm & haas g.m.b.h. British Patent 948,113
A catalyst formed of an alloy of two or more Pt metals or of one or more Pt metals with one or more Group VTa metals is used in preparation of dicyanogen by oxidation of HCN. 99% Pt and 1 % Pd alloy preferred.
Production of Aromatic Halogen Compounds
monsanto chemicals ltd British Patent 948,281
Pt or Pd, in the form of a halide of Pd or Pd/C, may be used in a process of providing halogeno-substituted aromatic compounds.
Purifying Sulphuric Acid
v.e.b. farbenfabrik wolfen British Patent 948,381
Concentrated H2SO4 containing oxidised N compounds is purified by electrolysis at 55-80°C. and current density at anode of 0.08-0.12 A/cm2 and at cathode of 0.20-0.25 A/cm2 in one or more closed cells using a cathode of Pt and an anode of Pt or Pb oxide.
rolls-royce ltd. British Patent 948,578
A prime mover ignition device comprises a number of cylindrical foraminate rolls of Pt or Rh or Pt-Rh alloy, supported in an annular formation by a mass of refractory material, having a flow passage or passages extending through it to lead combustion mixture to the rolls.
Hydrogenation of Cycloaliphatic Compounds
badische anilin & soda-fabrik a.g. British Patent 948,861
Metallic Pd and heavy metal ions (Cu, Ag, Zn, Cd, Hg, TI, Pb Sn, Sb, Bi, V or Zr) are used in the partial hydrogenation of cycloaliphatic compounds.
Production of Ethylene-diamine or its Derivatives
the pure oil co. British Patent 948,965
A Group VIII noble metal catalyst is used in the preparation of mineral acid salts or N-acyl derivatives of ethylene diamine by reacting cyanogen with hydrogen at 0°-300°C and a pressure of over 50 lb/sq. in. in the presence of the catalyst. Rh/Al2O3 is used.
allis-chalmers manufacturing co. British Patents 948,984; 948,985; 948,986
Relate to improved liquid fuel cell of the low temperature catalyst-activated type, which offers increased current density and in which the internal resistance of the cells is reduced. The fuel electrode (948,985) carries a catalyst of a Pt group metal.
union carbide corp. British Patent 949,044
Catalyst of elemental Pt on γ-Al2O3 is used in a process of preparing organosilicon compounds by reacting CH3C1 and a hydrogen halosilane of given general formula in the presence of the catalyst.
Preparation of Trans-9-oxodec-2-enoic Acid
“shell” research ltd. British Patent 949,319
Refers to the use of a Pd /BaSO4 catalyst at one stage in the preparation of the above compound.
Boron Doping Alloys
westinghouse electric corp. British Patent 949,653
Discloses a novel method of preparing a doping alloy for producing P-type doping in semiconductor material, using a master alloy of 40% B and 60% Pt by wt. and a sub-carrier of Pt, Cu, Fe, Co, Ni, Rh, Ru, Pd, Os or Ir. The master alloy is dissolved in the liquified carrier metal in such proportion that the melt contains not over 1% by wt. of the master alloy, and the melt is maintained above melting point of the carrier until uniform distribution of the boron is obtained.
Partial Oxidation of Hydrocarbons
national research & development corp. British Patent 951,100
Reference is made to the use of a combustion chamber lined with a Pt-Rh alloy in a process for producing an unsaturated hydrocarbon by partial oxidation of a saturated hydrocarbon, e.g. production of C2H2 from CH4.
leesona corp. British Patent 951,168
The fuel electrode of a fuel cell is formed of a non-porous plastic polymer structure surface coated with Pd, Pt, Rh or Ru. The polymer membrane may be polyethylene or a polyamide.
Preparation of 2-Amino-benzophenones
f. hoffmann-la roche & co. British Patent 951,301
The above materials are made by hydrogenating the unsubstituted 5-halo-2-amino-benzo-phenone with gaseous H2 in the presence of a Pd catalyst, a halide ion acceptor and an organic solvent. The catalyst may be formed in situ.
Production of Acyl-alkyl-phenols
the distillers co. ltd. British Patent 951,435
An acyl-alkyl-phenol is made by dehydrogenating an alkyl-substituted acyl cyclohexenone of given formula in the presence of a supported Pt metal catalyst.
dow corning corp. British Patent 951,489
Refers to the use of a solution of H2PtCl6 acid in dimethylphthalate in the preparation of a silylated polyepoxide of given general formula.
Production of Fuel Gas
badische anilin & soda-fabrik a.g. British Patent 951,518
A supported Pd/SiO2 cracking catalyst is used in the production of fuel gas from liquid hydrocarbons.
Manufacture of Methyl-4-ρ-aminophenyl-butyrate
the wellcome foundation ltd British Patent 951,628
A catalyst of Pd /C is used in a method of making the above compound by reduction with H2 in the presence of the catalyst of a 4-ρ -(lower acylamido) phenyl-4-oxobutyric acid dissolved in a CH3OH solution.
Synthesis of 5-Chloro-2,4-bis-(methylsul-phamyl) - aniline
abbott laboratories inc. British Patent 952,019
A Pd hydrogenation catalyst is used in the preparation of the above compound from 4,6-dichloro-I-3-bis (methylsulphamyl)-benzene.
Treatment of Exhaust Gases
w. r. grace & co British Patent 952,150
Describes a method of preparing a Pt-containing catalyst for use in the oxidation of exhaust gases from an internal combustion engine.
Electrodes and Electroplating
harshaw chemical co. British Patent 952,171
A Pt-coated anode is made by electroplating a Pt coating on a Ti base and then heat-treating the base at 400°-800°C for 15 seconds to 1 hour. See also 952,172.
New Quaternary Salt
chinoin gyogyszer es vegyeszeti termekek gyara rt. British Patent 952,289
I-Phenyl- l-cyclohexyl-3-piperidino- propanol-1 is made by reacting C5H5N with 1 -phenyl-1-cyclohexyl-i-hydroxypropyl-3 p-toluenesulphon-ate and reducing the pyridinium sulphonate thus obtained. The reduction is carried out as a catalytic hydrogenation with a Pd catalyst.
Developer for Electrostatic Images
burroughs corp. British Patent 952,326
An electrically conductive powder for developing electrostatic latent images consists of non-friable powder particles of 10-80 microns diameter, the particles having electrically non-conductive cores coated with an electrically conductive metal, e.g. Pd or Rh. Glass beads may be used as the particles.
Manufacture of Single Crystals
the general electric co. ltd. British Patent 952,385
Describes an apparatus for use in a novel method of making single crystals which includes a source material retainer formed of a perforated Pt disc or sheet, or a piece of Pt gauze or a perforated Pt vessel. The seed crystals are supported by thin Pt wires.
Formation of Metal Coatings
the international nickel co. (mond) ltd. British Patent 952,493
A dispersion of a Pt group metal flake powder in a liquid, which will volatilise or decompose under heat, is applied to a supporting surface and is heated to sinter the flakes to an adherent coating.
socony mobil oil co. inc. British Patent 952,622
The following method is employed to make a catalyst: hydrous A12O3 having a phase composition of 10-35% by wt. α-Al2O3.H2O and 65-90% of β-Al2O3.3H2O is mixed with (1) a Pt compound in sufficient amount to give a content of 0.01-5% by wt. of Pt in the catalyst and (2) not over 5% by wt. of HNO3 based on weight of A12O3; the mixture is dried and calcined at elevated temperature to convert the monohydrate to γ-Al2O3 and the trihydrate to η-Al2O3. The catalyst is stated to have unusual physical strength and strength retention.
Production of Acetaldehyde
nippon gosei kagaku k.k.k. British Patent 952,718
A catalyst comprising a salt of Pd, Rh or Pt and a salt of Cu, Zn, Cr, Mn, Fe, Co or Ni is used in producing acetaldehyde by reacting C2H4 with Oa and an aliphatic alcohol, (e.g. CH3OH or C2H5OH) in the presence of the catalyst at 50°-150°C and 1-100 atm.
the british petroleum co. ltd British Patent 953,187
A catalyst for isomerisation of C4 and higher paraffin hydrocarbons at below 400F is made by contacting an H2-containing A12O3 with CC14, CHC13 or CH2C12, or the like, under non-reducing conditions and such that chlorine is taken up by the A12O3 without production of free AICI3. The catalyst includes Pt or Pd.
Isomerisation of Paraffin Hydrocarbons
the british petroleum co, ltd. British Patents 953,188; 953,189
Covers processes for isomerisation of C4 and higher paraffin hydrocarbons using the catalyst of 953,187 above.
Production of Noble Metal Layers
n. v. philips gloeilampenfabrieken British Patent 953,431
A noble metal layer is formed on a non-metallic, non-conductive support photographically by subjecting a light-sensitive layer to a minor exposure (defined), treating the layer with an aqueous germ introduction agent including a water-soluble Hg or Ag compound which reacts with the layer to form a partly external metal germ image and physically developing this image with a non-stabilised intensifier. Layers of Au, Pt, Pd, Ir or Rh can be obtained. See also 953,432; 953,433.
monsanto chemicals ltd. British Patent 953,661
A Pd/C hydrogenation catalyst is used in a process of producing a dibenzofuran.
farbenfabriken bayer a.g. British Patent 953,747
A Pd hydrogenation catalyst is used in a process for pyrolysis of liquid hydrocarbon in which the cracked gasoline obtained in the pyrolysis is hydrogenated so as completely to hydrogenate the diolefines and leave the mono-olefines and aromatic compounds unchanged.
aerojet-general corp. British Patent 953,948
An alloy for use in brazing material is formed of: 96-1% Au, 72-1% Pd, 61-2% Ni, Cr and/or Co. Numerous examples given. The alloy is stated to be extremely resistant to corrosion by hot gases, moist conditions or corrosive liquid.
Production of Cyclohexylhydroxylamine
commercial solvents corp. British Patent 953,995
Cyclohexylhydroxylamine is made by hydro-genating nitrocyclohexene in the presence of Pd or Pt catalyst at 0-65°C and 100-2,000 p.s.i. pressure. 3-3½ moles of H2 are used for each mole of nitrocyclohexene.
chemetron corp. British Patent 954,203
A catalyst for use in the selective hydrogenation of highly unsaturated hydrocarbons in a concentrated olefin stream is formed of 0.01-0.09% by wt. Pd, 0.01-0.09% Cr deposited in an A12O3 carrier having a pore volume of surface pores of 0.0-0.4 c.c/g. Threshold diameter of surface pores is not over 800 Å.
N-substituted Nitro-phenylene Derivatives
bristol-myers co. British Patent 955,743
A Pt or Pd catalyst is used in the catalytic hydrogenation of a 2,4-dinitro-phenylamine to an acid addition salt of the corresponding 2-nitro-4-amino-phenylamine or para-phenylene-diamine derivative.
Manufacture of Dicyclohexylamine
abbott laboratories British Patent 956,116
Dicyclohexylamine is made by mixing equimolar amounts of phenol and aniline and subjecting the mixture, in a low pressure hydrogenation plant, to H2 gas at 100 p.s.i.g. or less and at room temperature to 100C in the presence of metallic Pd (0.45% by wt. of the mixture). The catalyst is supported on charcoal.
Separation of Hydrogen from Gaseous Mixtures
johnson, matthey & co. ltd. British Patent 956,176
A H2 diffusion membrane or tube is formed of an 0.05-2 wt.% B-Pd alloy.
Manufacture of Hydrogen Cyanide
e. i. du pont de nemours & co. British Patent 956,200.
HCN is made by passing over a Pt catalyst at 1000°-1200°C a mixture, pre-heated to 400°-525°C, of CH4 and NH, in a vol. ratio of 0.8 :1 to 1.2:1, and air in amount equivalent to 25-40% of that theoretically required for complete oxidation of the NH3 and CH4.
Decontamination of Palladium Diaphragms
a. o. smith corp. U.S. Patent 3,113,080
Pd diaphragms for transferring atomic H to hydrogenation cells are decontaminated and protected by applying a coating of Pd black or Pt black.
Catalytic Alkyl Benzene Isomerisation
sinclair research inc. U.S. Patent 3,113,979
Positional isomerisation and isomerisation between alkyl substituents are produced in a single stage process by the use of a catalyst consisting of a Pt metal and B oxide deposited on Al2O3.
Acetylene Selective Hydrogenation Catalyst
imperial chemical industries ltd. U.S. Patent 3,113,980
Acetylenes are selectively hydrogenated in the presence of olefines by the use of a catalyst consisting of Pd deposited of A12O3 having pores whose mean radius lies between 100-1400A.
general electric co. (new york) U.S. Patent 3,114,087
The adherence of electrodes made of Ta to tab leads is increased by applying a layer of Pd to the Ta.
Inlay Metal Strip
johnson, matthey & co. ltd. U.S. Patent 3,115,702
A Pt metal or alloy strip is bonded to a refractory metal base element by applying to the strip and element, in contact and encased in a metallic sheath, heat and uniform pressure simultaneously throughout the entire area thereof.
Fuel Cell Electrode-catalyst
a. j. hipp U.S. Patent 3,116,165
New electrode-catalyst is produced by the chemical deposition of Pd, Ir, Pt, Os or Ru on a Ni plaque by heating it in a solution of the Pt metal at 40-70°C and pH 1 or less.
Fuel Cell Electrode Production
shell oil co. U.S. Patent 3,116,170
A conductive layer of Ag is deposited by evaporation on a plate of non-conducting porous polyvinyl chloride, then further Ag is electrodeposited and finally Pd black catalysts applied.
Catalysed Nitrile Production
the pure oil co. U.S. Patent 3,116,313
The production of aromatic nitriles from the corresponding halides and HCN is catalysed by a Pt metal deposited on a refractory support. The same supported catalyst may be used for aliphatic nitriles (No. 3,116,318).
Multistage Catalytic Reforming Process
standard oil co. U.S. Patent 3,117,073
A hydrocarbon naphtha is hydroformed in the presence of a hydrogen-rich recycle gas and a Pt/Al2O3 catalyst in which the A12O3 surface area in a first stage is less than 130 ma/g and the area in a second stage is 130 m2/g or more.
Mixed Platinum Reforming Catalyst
standard oil co. U.S. Patent 3,117,096
New catalyst giving a high aromatic content from alkyl cyclopentanes consists of 1-20 wt.% BN and 0.1-2 wt.% of an Al2O3-supported Pt metal.
Catalyst for Olefine Oxidation
farbwerke hoechst a.g. U.S. Patent 3,118,001
A new catalyst system for the oxidation of olefins to aldehydes and ketones consists of a Pt metal, CuCl2 and either trichloroacetic acid, dibromo-acetic acid or their salts or mixtures.
Catalytic Nitric Acid Reduction
national distillers & chemical corp. U.S. Patent 3,119,657
HNO3 mixed with HC1, H2O and a Sn chloride is reduced to hydroxylamine (as hydrochloride) by H2 in the presence of Pt or Pd, e.g. Pt/C.
Olefine Oxidation Catalyst
farbwerke hoechst a.g. U.S. Patent 3,119,874
Olefines are oxidised to carbonyl compounds in aqueous neutral to acid medium in the presence of a catalyst consisting of a Pd salt and a redox system, e.g. PdCl2 and CuCl2. No. 3,119,875 covers the use of other Pt metal compounds.
Promoter for Silica-Zirconia Hydrocracking Catalysts
union oil co. U.S. Patent 3,120,483
The hydrocracking activity of SiO 2-ZrO catalysts is promoted by small amounts of Group VIII metals, e.g. Pt, Pd, Ir, Rh.
Dental Coping Alloy
niranium corp. U.S. Patent 3,121,629
A non-separating alloy for use with porcelain jackets to form a durable join consists of 40-55% Ni, 20-30% Cr and 20-25% of a Pt metal together with 1-4% of Be, Si and/or Mo.
Catalytic Acetylene Amine Reaction
phillips petroleum co. 17.5’. Patent 3,121,747
Acetylenic amines are produced by the reaction of a secondary amine, an acetylenic compound and H2 in the presence of Pt or Pd at o-200°C and 1-1000 p.s.i.
Graphite Bonding Method
u.s. atomic energy commission U.S. Patent 3,122,424
A bond is produced between graphite articles or between graphite and a metal by placing a Pt foil 2 mils or more thick between the surfaces, heating in an inert atmosphere with the surfaces in contact at 1800°C, cooling, machining away graphite to expose Pt and then brazing or soldering.
Catalytic Olefine Oxidation
consortium fur elektrochemische industrie g.m.b.h. U.S. Patent 3,122,586
New catalyst for the oxidation of olefines to aldehydes and ketones consists of a Pd, Ir, Ru, Rh or Pt compound and a redox system, e.g. PdCl2 used with CuCl2.
the metal box co. of south africa ltd. U.S. Patent 3,123,491
Pd is applied in finely dispersed form to the inside of a hermetically sealed food container, e.g. dispersed in a conventional can lacquer, and is able to remove residual O2 remaining after evacuation by catalysed combination with H2.
the international nickel co. ltd. U.S. Patent 3,123,544
The source of Ru for cathodic electroplating is an acid solution of at least 2.5 g/l Ru as tetra-sulphamato nitrosyl ruthenate. This aqueous solution avoids the need for molten electrolytes.
Isomerisation Catalyst Containing Palladium
the pure oil co. 17.5. Patent 3,123,573
A S-resistant isomerisation catalyst consists of a SiO2-Al2O3 support impregnated with a Pd compound to give a content of 0.3-0.8 wt.% Pd, with a F compound to give a content of 1-5 wt.% combined F, and reduced with H2 at 750-975°F.
Catalytic Hydrocarbon Reformation
imperial chemical industries ltd. French Patent 1,334,080
Hydrocarbons boiling up to 350°C (preferably at 30-220°C) are reformed by contact with steam at an elevated temperature in the presence of a supported catalyst containing a Pt metal or a compound reducible to such a metal. The catalyst preferably consists of 0.1-2.5 wt.% Rh/Al2O3. The production of the catalyst is described in 1,334,081.
dow chemical co. French Patent 1,334,504
Aromatic compounds having nitro and halo substituents are hydrogenated to haloarylamines in the presence of an Rh catalyst activated with an alkali or alkaline earth metal hydroxide, carbonate or acetate.
Monoskeletal Silver or Platinum Metal Catalyst Electrode
brown, boveri & cie. French Patent 1,337,705
Fuel cell porous electrodes are produced by compressing and sintering a catalyst metal (e.g. Ag, Pt, Pd, Rh) with a non-catalyst metal (e.g. Al or Zn) and removing the latter with acid.
Catalytic Hydroquinone Oxidation
ste. des usines chimiques rhone-poulenc French Patent 1,338,462
The oxidation of hydroquinone to p-benzoquin-one, effected with O2 in organic medium, is catalysed by Ru or Rh on an inert support, e.g. Rh on C black.
Acetylene Selective Hydrogenation
chemetron corp. French Patent 1,338,769
Acetylenic compounds mixed with dienes are selectively hydrogenated using a Pd-CuO catalyst, e.g. a catalyst containing 20-70% CuO, 30-80% Cr2O3 and 0.04-1% Pd.
Fuel Cell Electrodes
leesona corp. French Patents 1,338,755; 1,338,756; 1,338,757
The action of electrodes for fuel cells made of, inter alia, Ru, Rh, Os, Ir, Pt or Pd is improved by incorporating metallic Li in their surface. The electrode surface is coated with Pt/C after Li has been introduced. (No. 1,338,756).
Catalytic Vinyl Acetate Production
ste. des usines chimiques rhone-poulenc French Patent 1,339,614
Vinyl esters are produced by the reaction at elevated pressures and temperatures of ethylene and a fatty acid, particularly acetic acid, in the presence of a noble metal chloride, particularly Pd chloride, a lower fatty acid salt and benzo-quinone.
Pd-Cu Oxidation Catalysts
w. r. grace & co. French Patent 1,341,068
Catalysts for the treatment of exhaust gases from internal combustion engines by oxidation consist of a support containing 5-30% and preferably 10-20% CuO and 0.0025-0.4% Pd. A typical catalyst contains 0.01% Pd and 10% CuO on an A12O3 support.
Catalytic Acetaldehyde Production
nippon gosei kagaku k.k.k. French Patent 1,341,796
The oxidation of C2H4 in the presence of an aliphatic lower alcohol to acetaldehyde is catalysed by a noble metal, e.g. Pd or Pt.
Hydrocarbon Hydrogenation Catalyst
farbenfabriken bayer a.g. French Patent 1,342,470
Hydrocarbons boiling in the petrol range are hydrogenated over a catalyst consisting of a noble metal deposited on a porous support having a water absorption of at least 10% and an internal surface of less than about 100 m2/g. A typical catalyst consists of Pd on sintered A12O3.
Catalytic Dicyclohexylamine Production
abbott laboratories French Patent 1,343,391
A mixture of phenol and aniline is catalytically hydrogenated to dicyclohexylamine using H2 at 7 kg/sq. cm or less and 20-100°C in the presence of at least 0.45 wt.% metallic Pd, e.g. as Pd/C.
Cyclohexyl Hydroxylamine Catalytic Production
commercial solvents corp. French Patent 1,343,869
Nitrocyclohexane is hydrogenated over a Pt or Pd catalyst at 0-65C and 7-140 kg/cm2 to form cyclohexyl hydroxylamine.
Catalyst for Alcohol Production
consortium fur elektrochemische industrie g.m.b.h. German Patent 1,158,960
The hydrogenation of α, β-unsaturated aldehydes to the corresponding alcohols is catalysed by a PtO2 catalyst modified by an Fe or Zn salt.
Ruthenium Hydroformylation Catalyst
imperial chemical industries ltd. German Patent 1,159,926
The hydroformylation of olefines to form aldehydes and ketones is catalysed by the use of a composition containing Ru, e.g. RuCl3, supplied at the rate of 0.005-0.01%, based on the olefine.
Catalytic Reduction of Nitroaromatics
general aniline & film corp. German Patent 1,160,445
Aromatic monocyclic mononitro compounds are reduced to the corresponding amines by reduction at 25°-125°C using a noble metal catalyst having a surface area of at least 150 m2/g, e.g. Pt or Pd on C or Pd/Al2O3, the reaction water being dispersed as a separate liquid phase throughout the reaction zone.
Catalytic Carboxylate Production
the distillers co. ltd. German Patent 1,160,846
The production of alkyl carboxylates from optionally substituted olefines and cuprous halocar-boxylates is catalysed by Pd, e.g. metallic Pd or PdCl2.
Acetylene Hydrogenation Catalyst
v.e.b. leuna-werke “walter ulbricht” German Patent 1,161,555
New catalyst consists of an inert support impregnated with 0.002-5 wt.% of a mixture of Ag and Pt containing 60-90 wt.% Pt and a 20-80 fold amount of Fe oxide.
Catalyst for Alcohol Oxidation
esso research & engineering co. German Patent 1,161,873
Aldehydes or ketones are produced from saturated acyclic 3-8C alcohols by contact with O2 at 50-300°C in the presence of H2PtCl6, the catalyst being regenerated at 50-300°C in a separate zone using molecular O2.
Production of O-vinyl Compounds
farbwerke hoechst a.g. German Patent 1,161,878
The reaction of compounds containing OH groups and acetylene at elevated temperatures and pressures is catalysed by the presence of both (a) an alkali metal, Zn or Cd compound and (b) a Group VIII noble metal or a compound of such a metal, e.g. CdO used with Pd/C.
Fuel Cell Electrode
electric storage battery co. German Patent 1,161,965
Fuel cell electrode consists of a sintered mixture of 1-47% Ni, 3-15% Pd and 50-96% Ag.
Catalytic Cyclododecanonoxime Production
badische anilin-& soda-fabrik a.g. German Patent 1,162,359
2-Chloro-cyclododecanone-(i)-oxime which contains 1 or 2 olefinic bonds is converted to cyclododecanonoxime by reduction at 0-130°C in the presence of a Group VIII noble metal catalyst, e.g.Pd/BaSO4.
Catalytic Hydrogen Cyanide Production
imperial chemical industries ltd. German Patent 1,163,304
The conversion of NH3 and hydrocarbons to HCN over a Pt metal or alloy catalyst is improved by adding small amounts of a volatile S compound to the feedstock.
Catalytic Glycerol Purification
ste. d’electro-chimie, d’electro-metallurgie et des acieries electriques d’uginf. German Patent 1,164,387.
Glycerol produced synthetically is purified by catalytic hydrogenation in the presence of Ru and an acid ion exchange resin.
Production of Powdered Palladium
e. m. prokefev Russian Patent 157,112
High yields of finely dispersed powdered Pd are obtained by roasting palladosamine progressively until the temperature reaches 650°C. The resulting product is milled and then roasted again with the temperature rising to 800°C. The Pd is then held at this temperature for about 2 hours.