Method for green synthesis of SBA-15 mesoporous molecular sieve under assistance of ultraviolet radiation

Method for green synthesis of SBA-15 mesoporous molecular sieve under assistance of ultraviolet radiation

  • CN 106,829,993 B
  • Filed: 02/09/2017
  • Issued: 11/20/2020
  • Est. Priority Date: 02/09/2017
  • Status: Active Grant
First Claim
Patent Images

1. A method for green synthesis of SBA-15 mesoporous molecular sieve by ultraviolet light irradiation assistance comprises the following steps:

  • (1) mixing ethyl orthosilicate and water according to a certain proportion, and then mixing the mixture at a power density of 10-30 w/m2Stirring for 4-6 hours at 25-30 ℃

    under the ultraviolet radiation to hydrolyze to obtain a solution A;

    (2) mixing an organic template agent P123 and water according to a certain proportion, and stirring for 4-6 hours to obtain a solution B;

    p123Is polyethylene oxide-polypropylene oxide-polyethylene oxide with the molecular formula of EO20PO70EO20

    Ma=

    5800;

    (3) Slowly adding the solution B into the solution A to obtain an SBA-15 mesoporous molecular sieve initial sol system, and then performing power density of 10-30 w/m2Stirring for 20-30 hours at 30-50 ℃

    under the ultraviolet radiation;

    (4) adding a certain amount of water-soluble inorganic salt into the reaction solution obtained in the step (3);

    (5) crystallizing the reaction solution obtained in the step (4) at 90-110 ℃

    for 24-72 hours, then cooling the crystallized reaction product to 25-30 ℃

    , performing suction filtration, drying the suction filtration product in an air atmosphere at 50-80 ℃

    to obtain SBA-15 mesoporous molecular sieve raw powder, and finally roasting in an air atmosphere at 500-600 ℃

    for 5-6 hours to obtain the SBA-15 mesoporous molecular sieve;

    the mass ratio of the mixed tetraethoxysilane and water in the step (1) is TEOS;

    h2O=

    1:

    3~

    10;

    Organic template agent P in step (2)123Mass ratio to water is P123

    H2O=

    1:

    30~

    42.5;

    The dropping speed of the solution B in the step (3) is 25-35 mL/min;

    the water-soluble inorganic salt is NaCl, KCl or Na2SO4

    The total mass ratio of reactants in the step (4) is TEOS;

    p123;

    water-soluble inorganic salts;

    h2O=

    40:

    20:

    1~

    10:

    750~

    1000。

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×