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sapo-11 molecular sieve and its preparation method and its application in hydrocarbon isomerization
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A technology of SAPO-11 and molecular sieve, which is applied in the direction of molecular sieve catalyst, including molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, etc., which can solve problems such as environmental impact and increased production cost
Active Publication Date: 2021-04-09
CHINA UNIV OF PETROLEUM (BEIJING)
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[0007] In summary, it can be seen that in the prior art, additional templates need to be added in the process of preparing the carrier SAPO-11 of hydrocarbon isomerization catalysts, and most of the templates are organic templates, and the use of templates will cause certain damage to the environment. Affect and increase the preparation cost
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Embodiment 1
[0050] Dissolve 6.25g of aluminum isopropoxide in 51.70g of ethylene glycol, stir at a constant temperature of 25°C for 1h to obtain solution A;
[0051] 7.62g di-n-propylamine and 6.22g H 3 PO 4 Add to the above solution A, and stir at a constant temperature of 25 °C for 2 h to obtain solution B;
[0052] Add 1.28g of ethyl orthosilicate to the above solution B, and stir at a constant temperature of 25°C for 1.5h to obtain solution C;
[0053] Transfer the above solution C to 100ml of supercritical CO 2 In the reactor and sealed, pass CO into the reactor at 25°C 2 , so that the pressure in the reactor reaches 62.07bar;
[0054] supercritical CO 2 The reaction kettle was heated to 200°C, the autogenous pressure reached 124.14bar, and the thermostatic crystallization was performed for 144h;
[0055] supercritical CO 2 The reaction kettle was cooled to 25 °C, the product was centrifuged, dried at 120 °C for 12 h, and calcined at 600 °C for 6 h in an air atmosphere to obta...
Embodiment 2
[0066] Dissolve 7.50 g of aluminum isopropoxide in 51.70 g of ethylene glycol, and stir at a constant temperature of 25 °C for 1 h to obtain solution A;
[0067] 7.32g di-n-propylamine and 5.98g H 3 PO 4 Add to the above solution A, and stir at a constant temperature of 25 °C for 2 h to obtain solution B;
[0068] Add 1.22g of ethyl orthosilicate to the above solution B, and stir at a constant temperature of 25°C for 1.5h to obtain solution C;
[0069] Transfer the above solution C to a supercritical CO with 100 ml 2 In the reactor and sealed, pass CO into the reactor at 25°C 2 , so that the pressure in the reactor reaches 50.00bar;
[0070] supercritical CO 2 The reaction kettle was heated to 200°C, the autogenous pressure reached 90.25bar, and the constant temperature crystallization was performed for 144h;
[0071] supercritical CO 2 The reaction kettle was cooled to 25°C, the product was centrifuged, dried at 120°C for 12 hours, and calcined at 600°C for 6 hours in ...
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Abstract
The present invention provides SAPO‑11 molecular sieve and its preparation method and application in hydrocarbon isomerization, the preparation method comprises dissolving aluminum source in ethylene glycol, stirring to obtain solution A; adding structure directing agent and phosphorus source to In solution A, stir to obtain solution B; add silicon source to solution B, and stir to obtain solution C; transfer solution C to supercritical CO 2 In the reactor, CO was introduced 2 Increase the pressure; raise the reactor to the reaction temperature and crystallize; after crystallization, reduce the supercritical CO 2 The temperature of the reaction kettle is taken out, the solution in the kettle is taken out, the product is separated, dried and roasted to obtain SAPO-11. This method can prepare SAPO‑11 with small grain size and mesoporous structure without adding additional templating agent. Molecular sieves are formed, loaded with metal components, dried and calcined to obtain a hydrocarbon isomerization catalyst, which has higher double-branch isomerization selectivity and lower cracking selectivity, and can be used for hydrocarbon isomerization reactions.
Description
technical field [0001] The invention relates to a molecular sieve and a preparation method and application thereof, in particular to a SAPO-11 molecular sieve, its preparation method and the application of the SAPO-11 molecular sieve as a hydrocarbon isomerization catalyst carrier, belonging to the field of catalysts. Background technique [0002] Hydrocarbon hydroisomerization is an important technology in the petroleum refining process. The branched isomers produced by hydroisomerization can significantly reduce the pour point of lubricating oil, increase the viscosity-temperature of diesel oil, and increase the octane number of gasoline. The Pt / SAPO-11 catalyst has suitable acid sites and metal active sites, and has excellent catalytic activity for the hydroisomerization of hydrocarbons. The orifice of the microporous channel in the SAPO-11 molecular sieve is an oval ten-membered ring structure of 0.39 nm×0.63 nm, which is used as the carrier of the hydrocarbon isomeriza...
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