A kind of preparation method of high stability mesoporous molecular sieve containing rare earth heteroatom
A mesoporous molecular sieve, high-stability technology, applied in molecular sieve catalysts, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problems of unreported synthesis of mesoporous molecular sieves, unable to form effective units, etc. The effect of cost, high stability, good catalytic performance
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0068] This embodiment provides a kind of preparation method of seed crystal, and specific preparation process is as follows:
[0069] 250g of 3% (EO) 20 (PO) 70 (EO) 20 (P123) solution was placed in a 30°C water bath, and 50g of Y-type molecular sieve precursor 1 solution and 44g of lanthanum nitrate hexahydrate with a concentration of 40% were dropped into the above system for assembly, and the pH value was adjusted to about 1, and stirred after the addition was completed 12 hours, aged at 30°C for 20h. The product from the previous step was transferred to a crystallization kettle, and crystallized at 120°C for 18 hours to obtain the crystallized product of the first step. The first crystallization product was adjusted to pH 7.5 with ammonia water, then transferred to the crystallization kettle again, crystallized at 120°C for 24 hours, washed and dried, and roasted at 550°C for 10 hours to obtain seed crystal S1.
Embodiment 2
[0071] This embodiment provides a kind of preparation method of seed crystal, and specific preparation process is as follows:
[0072] The concentration of 120g is 3% (EO) 20 (PO) 70 (EO) 20(P123) solution was placed in a 50°C water bath, and 50g of Y-type molecular sieve precursor 2 solution and 22g of lanthanum chloride solution with a concentration of 30% were dropped into the above system for assembly, and the pH value was adjusted to about 1, and stirred after the addition was completed 12 hours, aged at 60°C for 20h. The product from the previous step was transferred to a crystallization kettle, and crystallized at 120°C for 18 hours to obtain the crystallized product of the first step. The first crystallization product was adjusted to pH 8.0 with ammonia water, then transferred to the crystallization kettle again, crystallized at 150°C for 24 hours, washed and dried, and roasted at 550°C for 10 hours to obtain seed crystal S2.
Embodiment 3
[0074] This example provides a method for preparing a heteroatom-containing mesoporous molecular sieve with high hydrothermal stability. The specific preparation process is as follows:
[0075] Add 5g of seed crystal S1 into 50g of Y-type molecular sieve precursor 1 solution, add 36g of 40% lanthanum nitrate hexahydrate dropwise into the above system at 30°C for assembly, adjust the pH value to about 1, and stir for 24 Hours, aged at 40°C for 20h. The product from the previous step was transferred to a crystallization kettle, and crystallized at 120°C for 18 hours to obtain the crystallized product of the first step. The first crystallization product was adjusted to pH 7.5 with ammonia water, then transferred to the crystallization kettle again, crystallized at 120°C for 24 hours, washed and dried to obtain heteroatom-containing mesoporous molecular sieve LM-1 with high hydrothermal stability.
[0076] Carry out X-ray crystal powder diffraction test on the rare earth heteroat...
PUM
| Property | Measurement | Unit |
|---|---|---|
| specific surface area | aaaaa | aaaaa |
| specific surface area | aaaaa | aaaaa |
| pore size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More