Terbium(III) carbonate hydrate
Terbium(Iii) Carbonate Hydrate, Reacton (Reo)
CAS: 100587-96-0
Molecular Formula: T2(CO3)3·xH2O
Terbium(III) carbonate hydrate - Names and Identifiers
Terbium(III) carbonate hydrate - Physico-chemical Properties
| Molecular Formula | T2(CO3)3·xH2O |
| Molar Mass | 490.91(anhy) |
| Water Solubility | Insoluble in water. |
| Appearance | Powder |
| Color | White |
| Storage Condition | Room Temprature |
| Sensitive | Hygroscopic |
| MDL | MFCD00149234 |
Terbium(III) carbonate hydrate - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 3 |
| TSCA | Yes |
Terbium(III) carbonate hydrate - Uses and methods of synthesis
Overview
hydrated terbium carbonate is a rare earth ion metal compound. Terbium carbonate is soluble in acid and emits carbon dioxide. Terbium carbonate is decomposed at high temperature to form an oxide of terbium. It is reported that hydrated terbium carbonate can be used to prepare an efficient and stable catalyst for aromatization of Pt-based n-alkanes.
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CN202010564426.5 provides an efficient and stable Pt-based n-paraffin aromatization catalyst and a preparation method. The invention provides a platinum-based n-paraffin aromatization catalyst, characterized in that it comprises the following components in parts by weight: 0.01-2 parts of platinum salt, 0.001-3.0 parts of A group IV A element, 0-4.8 parts of A rare earth ion or alkaline earth metal, the above are calculated according to the amount of metal; prepared by loading the above components on a KL molecular sieve. The rare earth ion metal compounds are cerium nitrate, cerium nitrate, cerium chloride, cerium sulfate, cerium dioxide, Cerium oxalate, cerium fluoride, praseodymium nitrate, praseodymium oxide, praseodymium trichloride hexahydrate, praseodymium acetate hydrate, praseodymium chloride, praseodymium fluoride, neodymium nitrate, neodymium oxide, neodymium hydroxide, neodymium oxide, samarium nitrate hexahydrate, samarium oxide, samarium hydroxide hydrate, Samarium chloride, europium oxide, europium nitrate, europium chloride anhydrous, europium sulfate, gadolinium nitrate, gadolinium oxide, gadolinium hydroxide, gadolinium chloride, terbium oxide, terbium nitrate, terbium chloride, terbium acetate hydrate, Terbium (cyclopentadienyl), terbium carbonate hydrate. The beneficial effects of the present invention are as follows: the Pt particle size of the obtained catalyst is small, the active site Pt has strong adsorption ability on KL molecular sieve, and the adsorption energy of carbon deposition on the active site PtxM cluster is weakened, the problems of carbon deposition and poor stability of the catalyst were effectively solved, and the selectivity of aromatic hydrocarbons was improved.
In the present invention, A group IV A element and A rare earth ion or alkaline earth metal are added to the Pt/KL catalyst to reduce the Pt particle size, the adsorption energy of Pt on KL molecular sieve was enhanced, and the formation of PtxM clusters weakened the adsorption capacity of carbon deposition, which effectively inhibited the agglomeration of Pt and improved the carbon deposition resistance of the catalyst. 2, while adding A IV A group element and A rare earth ion or alkaline earth metal can realize the appropriate regulation of the electronic properties of Pt, so that the electronic state of Pt is more conducive to the aromatic reaction of alkanes, at the same time, the occurrence of hydrogenolysis or secondary hydrogenolysis reaction is inhibited, so that the catalyst shows more excellent aromatization performance and aromatic selectivity. 3. The catalyst prepared by the present invention is used for the aromatization reaction of normal paraffins, and especially for the C6 to C8 normal paraffins, the selectivity of aromatics and the liquid yield are significantly improved. 4. The catalyst prepared in the present invention exhibits high stability in the aromatization reaction of N-paraffins, and has a good industrial prospect.
Last Update：2024-04-09 22:09:11
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