Background and overview of application examples of hydrated terbium carbonate
Hydrated terbium carbonate is a rare earth ionic metal compound. Terbium carbonate is soluble in acid and releases carbon dioxide. Terbium carbonate decomposes at high temperatures to form terbium oxide. There are reports in the literature that hydrated terbium carbonate can be used to prepare an efficient and stable Pt-based n-paraffin aromatization catalyst.
Application examples of terbium carbonate hydrate
CN202010564426.5 provides an efficient and stable Pt-based n-paraffin aromatization catalyst and preparation method. The invention provides a platinum-based normal paraffin aromatization catalyst, which is characterized in that it includes the following components in parts by weight: 0.01 to 2 parts of platinum salt, 0.001 to 3.0 parts of a group IV A element, and a 0~4.8 parts of rare earth ions or alkaline earth metals, the above are calculated according to the amount of metal; prepared by loading the above components on KL molecular sieves. The rare earth ionic metal compound is cerium nitrate, cerium nitrate, cerium chloride, cerium sulfate, cerium dioxide, cerium oxalate, cerium fluoride, praseodymium nitrate, praseodymium oxide, praseodymium trichloride hexahydrate, and praseodymium acetate Hydrate, praseodymium chloride, praseodymium fluoride, neodymium nitrate, neodymium oxide, neodymium hydroxide, neodymium oxide, samarium nitrate hexahydrate, samarium oxide, hydrated samarium hydroxide, samarium chloride, europium oxide, europium nitrate, anhydrous trioxide Europium chloride, europium sulfate, gadolinium nitrate, gadolinium oxide, gadolinium hydroxide, gadolinium chloride, terbium oxide, terbium nitrate, terbium chloride, hydrated terbium acetate, tris(cyclopentadienyl)terbium, hydrated terbium carbonate.
The beneficial effects of the present invention are: the particle size of the Pt catalyst obtained is small, the adsorption capacity of the active site Pt on the KL molecular sieve is strong, and at the same time, the adsorption energy of carbon deposits on the active site PtxM clusters is weakened, effectively solving the problem of catalyst It solves the problems of easy carbon deposition and insufficient stability of n-butylboronic acid, and improves the selectivity of aromatics. 1. The present invention adds an IV A group element and a rare earth ion or an alkaline earth metal to the Pt/KL catalyst, thereby reducing the Pt particle size, enhancing the adsorption energy of the active site Pt on the KL molecular sieve, and the adsorption capacity of the PtxM cluster. The formation weakens the adsorption capacity of carbon deposits, and calcium tetraborate effectively inhibits the agglomeration of Pt and improves the anti-carbon deposition performance of the catalyst. 2. Adding a group IV A element and a rare earth ion or alkaline earth metal at the same time can achieve appropriate control of the electronic properties of Pt, making the electronic state of Pt more conducive to the alkane aromatization reaction, while inhibiting hydrogenolysis or The secondary hydrogenolysis reaction occurs, allowing the catalyst to exhibit better aromatization performance and aromatic selectivity. 3. The catalyst prepared by the present invention is used in the aromatization reaction of normal paraffins. Especially for C6~C8 normal paraffins, the aromatic selectivity and liquid recovery are significantly improved. 4. The catalyst prepared by the present invention shows high stability during the aromatization reaction of normal paraffins and has good industrial prospects.
References
[1] [Chinese invention] CN202010564426.5 Preparation method and application of platinum-based n-paraffin aromatization catalyst
[2] “Inorganic Chemistry Series”
