Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Oxide platinum

Adams catalyst, platinum oxide, Pt02 H20. Produced by fusion of H2PtCl6 with sodium nitrate at 500-550 C and leaching of the cooled melt with water. Stable in air, activated by hydrogen. Used as a hydrogenation catalyst for converting alkenes to alkanes at low pressure and temperature. Often used on Si02... [Pg.15]

CATALYTIC REDUCTION WITH ADAMS PLATINUM OXIDE CATALYST... [Pg.470]

Method 1. From ammonium chloroplatinate. Place 3 0 g. of ammonium chloroplatinate and 30 g. of A.R. sodium nitrate (1) in Pyrex beaker or porcelain casserole and heat gently at first until the rapid evolution of gas slackens, and then more strongly until a temperature of about 300° is reached. This operation occupies about 15 minutes, and there is no spattering. Maintain the fluid mass at 500-530° for 30 minutes, and allow the mixture to cool. Treat the sohd mass with 50 ml. of water. The brown precipitate of platinum oxide (PtOj.HjO) settles to the bottom. Wash it once or twice by decantation, filter througha hardened filter paper on a Gooch crucible, and wash on the filter until practically free from nitrates. Stop the washing process immediately the precipitate tends to become colloidal (2) traces of sodium nitrate do not affect the efficiency of the catalyst. Dry the oxide in a desiccator, and weigh out portions of the dried material as required. [Pg.470]

Use 01 g. of the platinum oxide catalyst and 11 4 g, of pure cinnamic acid dissolved in 100 ml. of absolute alcohol. The theoretical volume of hydrogen is absorbed after 7-8 hours. Filter off the platinum, and evaporate the filtrate on a water bath. The resulting oil solidifies on cooling to a colourless acid, m.p. 47-48° (11-2 g.). Upon recrystallisation from light petroleum, b.p. 60-80°, pure dihydrocinnamic acid, m.p. 48-49°, is obtained. [Pg.474]

Place a solution of 10 -4 g. of benzalacetophenone, m.p. 57° (Section IV,130) in 75 ml. of pure ethyl acetate (Section 11,47,15) in the reaction bottle of the catalytic hydrogenation apparatus and add 0 2 g. of Adams platinum oxide catalyst (for full experimental details, see Section 111,150). Displace the air with hydrogen, and shake the mixture with hydrogen until 0 05 mol is absorbed (10-25 minutes). Filter oflF the platinum, and remove the ethyl acetate by distillation. RecrystaUise the residual benzylacetophenone from about 12 ml. of alcohol. The yield of pure product, m.p. 73°, is 9 g. [Pg.734]

Hydrocinnamic acid may also be prepared by the reduction of cinnamic acid with sodium and alcohol or with sodium amalgam or with hydrogen in the presence of Adams platinum oxide catalyst (Section 111,150) ... [Pg.753]

The Adams platinum oxide catalyst gives satisfactory results in the reduction of ozonidea. [Pg.893]

Palladium catalysts are useful alternatives to Adams platinum oxide catalyst described in Section 111,150. The nearest equivalent to the latter is palladium chloride upon carbon and it can be stored indefinitely the palladium salt is reduced to the metal as required ... [Pg.949]

Reduction. Quinoline may be reduced rather selectively, depending on the reaction conditions. Raney nickel at 70—100°C and 6—7 MPa (60—70 atm) results in a 70% yield of 1,2,3,4-tetrahydroquinoline (32). Temperatures of 210—270°C produce only a slightly lower yield of decahydroquinoline [2051-28-7]. Catalytic reduction with platinum oxide in strongly acidic solution at ambient temperature and moderate pressure also gives a 70% yield of 5,6,7,8-tetrahydroquinoline [10500-57-9] (33). Further reduction of this material with sodium—ethanol produces 90% of /ra/ j -decahydroquinoline [767-92-0] (34). Reductions of the quinoline heterocycHc ring accompanied by alkylation have been reported (35). Yields vary widely sodium borohydride—acetic acid gives 17% of l,2,3,4-tetrahydro-l-(trifluoromethyl)quinoline [57928-03-7] and 79% of 1,2,3,4-tetrahydro-l-isopropylquinoline [21863-25-2]. This latter compound is obtained in the presence of acetone the use of cyanoborohydride reduces the pyridine ring without alkylation. [Pg.390]

Isoquinoline can be reduced quantitatively over platinum in acidic media to a mixture of i j -decahydroisoquinoline [2744-08-3] and /n j -decahydroisoquinoline [2744-09-4] (32). Hydrogenation with platinum oxide in strong acid, but under mild conditions, selectively reduces the benzene ring and leads to a 90% yield of 5,6,7,8-tetrahydroisoquinoline [36556-06-6] (32,33). Sodium hydride, in dipolar aprotic solvents like hexamethylphosphoric triamide, reduces isoquinoline in quantitative yield to the sodium adduct [81045-34-3] (25) (152). The adduct reacts with acid chlorides or anhydrides to give N-acyl derivatives which are converted to 4-substituted 1,2-dihydroisoquinolines. Sodium borohydride and carboxylic acids combine to provide a one-step reduction—alkylation (35). Sodium cyanoborohydride reduces isoquinoline under similar conditions without N-alkylation to give... [Pg.396]

In catalytic toluene hydrodealkylation, toluene is mixed with a hydrogen stream and passed through a vessel packed with a catalyst, usually supported chromium or molybdenum oxides, platinum or platinum oxides, on siHca or alumina (50). The operating temperatures range from 500—595°C... [Pg.41]

If hydrogenation of the reaction mixture is begun in the presence of platinum oxide, a long induction period or lag occurs before the catalyst is reduced. [Pg.39]

Styrene oxide [96-09-3] M 120.2, b 84-86 /16.5mm, d 1.053, n 1.535. Fractional distn at reduced pressure does not remove phenylacetaldehyde. If this material is present, the styrene oxide is treated with hydrogen under 3 atmospheres pressure in the presence of platinum oxide. The aldehyde, but not the oxide, is reduced to 6-phenylethanol) and separation is now readily achieved by fractional distn. [Schenck and Kaizermen J Am Chem Soc 75 1636 1953.]... [Pg.353]

A) From Cholesieryl Acetate (Note 6).-—Five grams of cholesteryl acetate (Note 7) and o.r g. of platinum oxide are... [Pg.45]

Dihydrocholesterol has been prepared by the reduction of cholestenone with sodium and amyl alcohoP and by the hydrogenation of cholesterol. In the presence of platinum black or platinum oxide, yields varying from 6.5 per cent to 40 per cent have been obtained in ether, acetone, ethyl acetate, and acetic acid. ... [Pg.47]

Ammonium chloroplatinate often can be used to advantage in place of chloroplatim c acid in the preparation of Adams catalyst. A mixture of 3 g. of ammonium chloroplatinate and 30 g. of sodium nitrate in a casserole or Pyrex beaker is heated gently at first until the rapid evolution of gas slackens and then more strongly until a temperature of 500° is reached. This operation requires about fifteen minutes and there is no spattering. The temperature is held at 500-520° for one-half hour and the mixture is then allowed to cool. The platinum oxide catalyst, collected in the usual way by extracting the soluble salts with water, weighs 1.5 g. and it is comparable in appearance and in activity to the material prepared from chloroplatinic acid. [Pg.98]

This procedure is particularly time-saving when scrap platinum or spent catalyst is used for the preparation of platinum oxide, for after conversion to chloroplatinic acid a purification is conveniently effected by precipitating the ammonium salt, and the direct fusion of this with sodium nitrate eliminates the tedious process of reconversion to chloroplatinic acid. Furthermore ammonium chloroplatinate is not hygroscopic and can he accurately weighed. The amount of catalyst obtained is almost exactly half the weight of the ammonium salt employed. [Pg.98]

CjgHjoOgNa. SHgO, m.p. 304° (dec.), after sintering at 285°, acid to litmus, decolourises permanganate absorbs 2 mols, of hydrogen ir presence of platinum oxide as a catalyst. [Pg.594]

In presence of platinum oxide as catalyst in methyl alcohol, it hydrogenates to dihydrowogermine, which darkens >265° and melts at 277-8° (dec.) [a]n ° — 61° (pyridine). The dihydro-base still contains eight... [Pg.711]

Gaseous hydrogen chloride is bubbled through a solution of 0.8 g of 22,23-dibromoergost-8(14)-en-3/3-yl acetate in 25 ml of chloroform at 0° for 2 hr. The solvent is removed by evaporation and the solid mixture of A8(i4) A -isomers is hydrogenated over platinum oxide (0-2 g) in ether... [Pg.124]

Because of the presence of alkali in Raney nickel, ketones are hydrogenated over this catalyst to yield the more stable, equatorial alcohol e.g. 59) as the predominant product, Similar results can be expected with platinum in basic media or with platinum oxide in an alcoholic solvent since this catalyst also contains basic impurities. [Pg.135]

The most commonly used catalysts are palladized charcoal or calcium carbonate and platinum oxide. For better isotopic purity, the use of platinum oxide may be preferred for certain olefins since the substrate undergoes fewer side reactions while being chemisorbed on the platinum surface as compared to palladium.Suitable solvents are cyclohexane, ethyl acetate, tetrahydrofuran, dioxane or acetic acid-OD with platinum oxide. [Pg.180]


See other pages where Oxide platinum is mentioned: [Pg.318]    [Pg.470]    [Pg.470]    [Pg.471]    [Pg.473]    [Pg.889]    [Pg.1000]    [Pg.1001]    [Pg.42]    [Pg.390]    [Pg.292]    [Pg.74]    [Pg.130]    [Pg.38]    [Pg.45]    [Pg.26]    [Pg.58]    [Pg.581]    [Pg.119]    [Pg.130]    [Pg.136]    [Pg.139]    [Pg.240]    [Pg.483]    [Pg.28]   
See also in sourсe #XX -- [ Pg.166 ]

See also in sourсe #XX -- [ Pg.119 ]

See also in sourсe #XX -- [ Pg.39 , Pg.162 ]

See also in sourсe #XX -- [ Pg.379 ]

See also in sourсe #XX -- [ Pg.4 , Pg.723 , Pg.725 ]

See also in sourсe #XX -- [ Pg.715 ]

See also in sourсe #XX -- [ Pg.119 ]

See also in sourсe #XX -- [ Pg.443 ]

See also in sourсe #XX -- [ Pg.222 , Pg.223 ]

See also in sourсe #XX -- [ Pg.268 ]

See also in sourсe #XX -- [ Pg.8 , Pg.12 , Pg.36 , Pg.66 ]

See also in sourсe #XX -- [ Pg.231 ]

See also in sourсe #XX -- [ Pg.27 , Pg.28 ]

See also in sourсe #XX -- [ Pg.8 , Pg.12 , Pg.36 , Pg.66 ]

See also in sourсe #XX -- [ Pg.159 ]

See also in sourсe #XX -- [ Pg.684 , Pg.687 ]

See also in sourсe #XX -- [ Pg.166 ]

See also in sourсe #XX -- [ Pg.166 ]

See also in sourсe #XX -- [ Pg.382 ]

See also in sourсe #XX -- [ Pg.715 ]

See also in sourсe #XX -- [ Pg.114 ]

See also in sourсe #XX -- [ Pg.789 ]

See also in sourсe #XX -- [ Pg.193 , Pg.194 ]

See also in sourсe #XX -- [ Pg.56 , Pg.64 , Pg.133 , Pg.134 ]

See also in sourсe #XX -- [ Pg.26 , Pg.35 ]

See also in sourсe #XX -- [ Pg.159 ]

See also in sourсe #XX -- [ Pg.312 , Pg.584 , Pg.586 , Pg.1160 ]

See also in sourсe #XX -- [ Pg.827 ]

See also in sourсe #XX -- [ Pg.554 ]

See also in sourсe #XX -- [ Pg.163 ]

See also in sourсe #XX -- [ Pg.19 , Pg.20 , Pg.21 , Pg.22 , Pg.29 , Pg.31 , Pg.64 , Pg.72 , Pg.119 , Pg.143 , Pg.144 , Pg.146 ]

See also in sourсe #XX -- [ Pg.182 ]

See also in sourсe #XX -- [ Pg.41 , Pg.42 , Pg.206 ]

See also in sourсe #XX -- [ Pg.15 , Pg.52 ]

See also in sourсe #XX -- [ Pg.96 ]

See also in sourсe #XX -- [ Pg.52 , Pg.58 , Pg.60 , Pg.63 , Pg.82 , Pg.90 ]

See also in sourсe #XX -- [ Pg.80 , Pg.98 , Pg.100 , Pg.222 , Pg.223 , Pg.241 , Pg.242 , Pg.243 , Pg.245 , Pg.268 , Pg.269 , Pg.296 ]

See also in sourсe #XX -- [ Pg.260 , Pg.262 ]




SEARCH



Acetophenones platinum oxide catalyst

Adams Platinum Oxide

Adams platinum oxide catalyst

Adsorption and Electro-Oxidation of CO at Pure Platinum Catalysts

Alcohol Oxidation at Platinum-Based Electrocatalysts

Alkanes platinum-catalyzed oxidations

Aluminum oxide catalysts, platinum

Ammonia oxidation platinum catalysts

Ammonia oxidation platinum recovery

Carbohydrates selective catalytic oxidation of, employing platinum catalysts

Carbon monoxide oxidation, on platinum

Carbon monoxide oxidation, platinum supported

Carbon monoxide oxidation, platinum supported catalyst preparation

Carbon monoxide oxidation, platinum supported catalysts

Carbon monoxide oxidation, platinum supported catalytic activity

Catalysis platinum oxide

Catalyst platinum/palladium partial oxidation

Catalysts platinum, in selective catalytic oxidation

Catalysts platinum, in selective catalytic oxidation of carbohydrates

Catalysts rhodium-platinum oxide

Catalytic oxidation on platinum

Catalytic reduction, with Adams’ platinum oxide catalyst

Characterization platinum oxide

Coatings platinum metal oxides

Copper oxide-platinum catalyst

Dehydrogenations oxidative, over platinum

Diimines, platinum -diimine oxidation

Electrochemical Syntheses of Partially Oxidized Platinum Complexes

Ethylene oxidation on platinum

Formic acid oxidation on Platinum

H2 Oxidation on Platinum in Contact with an Ion-Exchange Membrane

Highly dispersed platinum, oxidation

Hydrous oxide growth on platinum

Monolithic oxidation catalysts, platinum

Nickel oxide/platinum electrodes

Oxidation employing platinum catalysts

Oxidation of CO on Platinum

Oxidation of highly dispersed platinum

Oxidation of hydrogen on platinum

Oxidation of platinum

Oxidation on Platinum Electrode

Oxidation over platinum

Oxidation over platinum, carbon monoxide

Oxidation platinum

Oxidation platinum

Oxidation platinum monolithic

Oxidation platinum-catalysed

Oxidations platinum-catalyzed

Oxidative addition platinum hydride complexes

Oxidative addition reactions platinum hydride complexes

Oxidizing agents platinum compounds

Oxidizing agents platinum hexafluoride

Oxygen reduction reaction platinum oxide formation

Platinum 4 oxidation state

Platinum alcohol oxidation

Platinum alloy ammonia oxidation gauze

Platinum ammonia oxidation

Platinum catalyst, catalytic oxidation

Platinum catalysts carbon monoxide oxidation

Platinum cinnamyl alcohol oxidation

Platinum complex, olefin oxidation

Platinum complexes anodic oxidation

Platinum complexes oxidation catalysts

Platinum complexes oxidative addition

Platinum complexes oxidative reductive elimination

Platinum complexes partially oxidized

Platinum electrodes oxide film

Platinum fructose oxidation

Platinum gluconic acid oxidation

Platinum glucopyranoside oxidation

Platinum glycerol oxidation

Platinum glyoxal oxidation

Platinum group oxides

Platinum iodides,-998------------------------oxides

Platinum nitrogen oxide decomposition

Platinum ores oxides

Platinum oxidation catalyst

Platinum oxidation mechanisms

Platinum oxidation-reduction cycles

Platinum oxide catalyst

Platinum oxide composition

Platinum oxide diffraction

Platinum oxide electrodes

Platinum oxide film formation

Platinum oxide fluoride

Platinum oxide formation

Platinum oxide hydrogenation catalyst

Platinum oxide impurities

Platinum oxide preparation

Platinum oxide quinoline

Platinum oxide quinones

Platinum oxide reduction

Platinum oxide vinyl halides

Platinum oxide, brown

Platinum oxide, catalytic dehydrogenation

Platinum oxide, transport model

Platinum oxide-supported metal catalysts

Platinum oxides catalysts, oxygen production from water

Platinum oxides colloidal

Platinum oxides in photoproduction of hydrogen from water

Platinum oxidized

Platinum salts, bis partially oxidized

Platinum sucrose oxidation

Platinum sulfite oxidation

Platinum tartronic acid oxidation

Platinum zero oxidation state

Platinum, tetracyano partially oxidized

Platinum-catalyzed oxidation, effect

Platinum-catalyzed oxidations catalysts

Platinum-catalyzed oxidations mechanism

Platinum-copper oxide

Platinum-group metals oxide-film formation

Platinum-group metals oxides

Platinum-magnesium oxide catalysts

Platinum-rhodium oxide, hydrogenation

Platinum-rhodium oxide, hydrogenation aromatic rings

Platinum-rhodium oxide, hydrogenation ketones

Platinum/alumina catalyst oxidation reactions

Platinum/titanium oxide

Preparation of platinum oxide

Re-dispersion of Platinum Supported on Ceria-based Oxide

Rhodium platinum oxide, reductions

Rhodium-platinum oxide

Saline platinum oxidation

Selective catalytic oxidation employing platinum catalysts

Selective catalytic oxidation of, employing platinum catalysts

Sintering Inhibition Mechanism of Platinum Supported on Ceria-based Oxide

Styrene oxide, reaction with platinum

The nature of oxidized platinum electrodes

The oxidation of carbon monoxide on platinum

Valent Platinum Oxides

Volatile platinum oxides

Zinc iron oxide/platinum electrodes

Zinc oxide/platinum electrodes

© 2024 chempedia.info