A heterogeneous dewaxing catalyst and a method for preparing the same

Abstract

The application relates to a preparation method of an isomerization dewaxing catalyst, which comprises the following steps: (1) catalyst carrier preparation: mixing and adding a mesoporous molecular sieve, amorphous silicon aluminum and a titanium aluminum composite oxide into a plasticizing agent and a binder, kneading the mixture, extruding the mixture into a shape, drying and roasting to obtain a catalyst carrier, wherein the drying condition is 100-130 DEG C for 1-24 h, and the roasting condition is 400-600 DEG C for 4-24 h; (2) putting the catalyst carrier into an impregnation solution for impregnation treatment, and the impregnation time is 2-24 h; and (3) drying and roasting the impregnated catalyst carrier to obtain a catalyst product.

Claims

1. A method for preparing an isomerization dewaxing catalyst, characterized in that, Includes the following steps: (1) Preparation of catalyst support: Mesoporous molecular sieve, amorphous silicon aluminum, titanium aluminum composite oxide are mixed and extrusion aid and binder are added. The mixture is kneaded and extruded into shape, then dried and calcined to obtain catalyst support. The drying conditions are 100~130℃ for 1~24h and the calcination conditions are 400~600℃ for 4~24h. (2) The catalyst support is immersed in the impregnation solution for impregnation treatment for 2 to 24 hours; (3) The impregnated catalyst support is dried and calcined to obtain the finished catalyst product; The amorphous silicon-aluminum has a pore volume of 0.5~1.6 mL / g and a specific surface area of ​​300~600 m². 2 / g, average pore size 8~14nm, infrared acidity 0.25~0.55mmol / g; The titanium-aluminum composite oxide has a pore volume of 0.7~1.5 mL / g and a specific surface area of ​​300~450 m² / g. 2 / g, average pore size 8~16nm.

2. The preparation method according to claim 1, characterized in that, Step (1) also includes mixing the mesoporous molecular sieve, amorphous silicon aluminum and titanium aluminum composite oxide and then pressing them into tablets.

3. The preparation method according to claim 2, characterized in that, The mesoporous molecules are selected from at least one of SAPO-11, SAPO-31, SAPO-41, ZSM-23, SSZ-32, EU-13, ISI-4, KZ-1, θ-1, ISI-1, KZ-2, NU-10, and ZSM-22.

4. The preparation method according to claim 2, characterized in that, The amorphous aluminum silica contains 5–75 wt% silicon oxide.

5. The preparation method according to claim 1 or 4, characterized in that, The amorphous aluminum silica contains 15–50 wt% silicon oxide, has a pore volume of 1.0–1.4 mL / g, and a specific surface area of ​​350–500 m² / g. 2 / g, average pore size 10~13nm, infrared acidity 0.35~0.45mmol / g.

6. The preparation method according to claim 2, characterized in that, The titanium oxide content in the titanium-aluminum composite oxide is 5~50wt%.

7. The preparation method according to claim 1 or 6, characterized in that, The titanium-aluminum composite oxide contains 10-50 wt% titanium oxide, has a pore volume of 0.8-1.2 mL / g, and a specific surface area of ​​320-450 m². 2 / g, with an average pore size of 13~15nm.

8. The preparation method according to claim 1, characterized in that, In step (1), the binder includes one or more of alumina, aluminum hydroxide, boehmite, aluminum sol, and silica sol.

9. The preparation method according to claim 8, characterized in that, In step (1), the adhesive includes pore alumina or pore boehmite material.

10. The preparation method according to claim 1, characterized in that, In step (1), the drying temperature is 100-120℃ and the drying time is 1-12h; the calcination temperature is 500-550℃ and the calcination time is 4-12h.

11. The preparation method according to claim 1, characterized in that, In step (2), the impregnation time is 4 to 16 hours; the impregnation method is selected from any one of ion exchange, equal volume impregnation and coprecipitation.

12. An isomeric dewaxing catalyst prepared by the preparation method according to any one of claims 1-11, characterized in that, The heterogeneous dewaxing catalyst support contains 5-90 wt% mesoporous molecular sieve, 5-70 wt% amorphous silica-alumina, 0.2-20 wt% titanium-aluminum composite oxide, and 0-30 wt% binder. The active metal component of the heterogeneous dewaxing catalyst contains at least one of Pt, Pd, Ru, Rh, and Ni, with a metal content of 0.1-2.0 wt%. The metal salt is selected from at least one of halide salts, amine complex salts, nitrates, carbonates, bicarbonates, carboxylates, and formates. The specific surface area of ​​the heterogeneous dewaxing catalyst is 100-250 m². 2 / g, pore volume is 0.25~0.65mL / g, and infrared acidity is 0.25~0.65mmol / g.

13. The isomerization dewaxing catalyst according to claim 12, characterized in that, The heterogeneous dewaxing catalyst support has a mesoporous molecular sieve content of 40-80 wt%, an amorphous silica-alumina content of 10-50 wt%, a titanium-aluminum composite oxide content of 1.0-10 wt%, and a binder content of 0-20 wt%; the metal content is 0.2-0.8 wt%.

14. The isomerization dewaxing catalyst according to claim 12, characterized in that, The isomerization dewaxing catalyst has a specific surface area of ​​120–200 m². 2 / g, pore volume is 0.30~0.50mL / g, and infrared acidity is 0.35~0.60mmol / g.

Images