palladium(2+) dihydroxide
Palladium hydroxide
CAS: 12135-22-7;63310-18-9
Molecular Formula: H2O2Pd
palladium(2+) dihydroxide - Names and Identifiers
| Name | Palladium hydroxide |
| Synonyms | Pearlmans Catalyst palladium dihydrate Palladium hydroxide Palladium-Katalysator Palladium(II)dihydoxide palladium(2+) dihydroxide Palladium hydroxide (Pd(OH)2) |
| CAS | 12135-22-7 63310-18-9 |
| EINECS | 235-219-2 |
| InChI | InChI=1/2H2O.Pd/h2*1H2;/q;;+2/p-2 |
| InChIKey | NXJCBFBQEVOTOW-UHFFFAOYSA-L |
palladium(2+) dihydroxide - Physico-chemical Properties
| Molecular Formula | H2O2Pd |
| Molar Mass | 140.43 |
| Density | 3.44[at 20℃] |
| Boling Point | 100°C at 760 mmHg |
| Water Solubility | INSOLUBLE |
| Vapor Presure | 24.5mmHg at 25°C |
| Appearance | powder |
| Color | White |
| Solubility Product Constant(Ksp) | pKsp: 31.0 |
| Merck | 14,7060 |
| Storage Condition | Inert atmosphere,Room Temperature |
palladium(2+) dihydroxide - Risk and Safety
| Risk Codes | R11 - Highly Flammable R36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S22 - Do not breathe dust. S24/25 - Avoid contact with skin and eyes. S14 - Keep away from ... (a list of incompatible materials will follow). S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S20/21 - S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S33 - Take precautionary measures against static discharges. S27 - Take off immediately all contaminated clothing. S16 - Keep away from sources of ignition. S7/9 - |
| UN IDs | UN1325 |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 38151200 |
| Hazard Class | 4.1 |
| Packing Group | III |
palladium(2+) dihydroxide - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| properties | Palladium hydroxide, alias palladium (II) oxide monohydrate, pale yellow-dark brown powder, dried in air, the water content is 1 ~ 15%, and the water will be slowly lost by heating, and the oxygen released at 500~600 °c will be decomposed before it becomes anhydrate. As a result of precipitation, Palladium hydroxide has strong activity and can be dissolved by acid. The Palladium hydroxide obtained by drying is not easy to dissolve, and ammonia gas will be generated by heating together with ammonium chloride aqueous solution. In case of formic acid, formaldehyde, etc. will be reduced to metal. |
| Application | Palladium hydroxide has a wide range of applications in the field of pharmaceutical organic synthesis and chemical industry, mainly plays a role in catalytic hydrogenation, these include debenzylation, hydrogenation of olefins, reduction of benzoic acid, oxidation of aldehydes, and the like. catalysts, raw materials for the synthesis of various Palladium compounds and catalysts. Debenzylation reagent |
| synthesis method | method 1, weigh palladium chloride such as 1.68g dissolved in as little hydrochloric acid as possible, the reaction is then neutralized with, for example, a 1.0mol/L aqueous sodium hydroxide solution to give a palladium hydroxide precipitate, which is washed with deionized water to no chloride ions. method 2, weigh 10.00g(94.0mmol) of palladium powder in a beaker, add 115 ml of aqua regia in batches, cover the surface dish and heat it at ℃ for 1H to dissolve the Palladium powder, then remove the surface dish, continue to heat and Dropwise Add 10ml of hydrochloric acid with a mass fraction of 37% to facilitate the escape of nitrogen oxides. During the heating process, the liquid level is kept at 20mL (the purpose of maintaining the liquid level is to prevent the precipitation of palladium compounds and then oxidize to palladium oxide), and if the liquid level drops, the volume of the solution is kept unchanged by adding pure water), until there is no yellow-brown gas in the beaker, the heating is stopped and the removal of the nitrate is finished; After the removal of the nitrate is completed, the volume of the solution is boiled to 10ml, and 20ml of 30% wt sodium hydroxide solution is added and stirred evenly; the filtrate was collected by Suction filtration with a sand core funnel, and the residue was washed with pure water for several times. The filtrate and washing solution were collected, and the residue was dried to obtain Palladium hydroxide crystals. |
| preparation | A preparation method of highly active palladium Hydroxide Carbon, comprising the following steps: S1, conductive carbon black pretreatment: weigh 4.5g of XC-72 conductive carbon black into a 250ml container, add 10ml of methanol and 100ml of ultrapure water, treat for 1H, then filter, wash and dry to obtain the treated carbon black; S2, impregnation of palladium precursor: add 0.5 of ultrapure water to the treated carbon black in S1, and then pour the Palladium acetate solution (palladium content is g), stirring at the speed of 100RMP, stirring Time 2h; S3, precipitation of palladium hydroxide: sodium hydroxide solution added to the mixed solution obtained by S2, adjust the pH to 9~11, with 100RMP stirring speed, microwave heating reaction, microwave power 600w, reaction time 10min, aging 12H; S4, post-treatment: the aging solution in S3 was filtered, and ultra pure water cleaning 3~10 times, until the pH value of the filtrate is neutral, and then 100 deg C vacuum drying to moisture content of 50%, get high activity Palladium Hydroxide Carbon product, vacuum Encapsulation. |
| production method | 30g of palladium chloride was dissolved in 43ml of concentrated hydrochloric acid and 570ml of water, 68.6g of activated carbon was added, rapidly stirred and heated to 60 °c. To this mixture is added 31g of granular sodium hydroxide, preferably at a rate not exceeding 80 °c. Then 6.6g of solid sodium bicarbonate was added to the mixture and stirred for 12h. The catalyst was filtered off, washed with 430ml of water and then washed with a mixture of 430ml of water and 8.6ml of acetic acid. The catalyst was filtered off and dried under vacuum at 65 °c. Stored under N2 protection. |
Last Update：2024-04-10 22:29:15
