Method for preparing Ti-Mg-Zr mixing doped MCM-41 mesoporous molecular sieve
A mesoporous molecular sieve, MCM-41 technology, applied in molecular sieve compounds, molecular sieves and base exchange compounds, chemical instruments and methods, etc., can solve the problems of poor hydrothermal stability, narrow use, and poor catalytic performance.
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Embodiment 1
[0048] 1. Preparation of MCM-41 mesoporous molecular sieve:
[0049] ①. Use CTAB as a single template to prepare a homogeneous solution of cationic template
[0050] Weigh 2.2g of CTAB with an electronic balance, add it to the beaker A containing 42.3ml of deionized water measured in advance, and stir it evenly with a magnetic stirrer;
[0051] ②, adjust the pH of the cationic template solution
[0052] Take 11.5ml of ammonia water and 66.73ml of absolute ethanol in beaker B and stir evenly, pour the liquid in beaker B into beaker A, and adjust the pH to 9-10;
[0053] ③. Add inorganic silicon source to make it polycondensate with organic template
[0054]Slowly add 4.44ml of ethyl silicate (TEOS) to the pH-adjusted solution, and stir at room temperature for 5 hours to make the final mixture in a colloidal state. This process has been kept stirring, so that the templating agent and the silicon source Complete response;
[0055] ④. Transfer and crystallize the fully reacted...
Embodiment 2
[0062] Preparation of Ti-doped MCM-41 mesoporous molecular sieve:
[0063] Weigh 0.4g of MCM-41 mesoporous molecular sieve and disperse it in a beaker filled with 35mL of absolute ethanol to form solution A, stir for 30min until the solution is completely mixed; then weigh 0.07947g of titanium dioxide and disperse it in 15mL of absolute ethanol After stirring evenly, slowly add it to solution A to make the two solutions mix, and continue to stir for 1h. During this process, heteroatoms are adsorbed on the surface of molecular sieves; then dropwise add 5mL 0.5M dilute hydrochloric acid and 10mL The C solution composed of deionized water was stirred for another 2 hours, and then 10 mL of deionized water was added dropwise. After the hydrolysis was complete, the stirring was continued for 2 hours to ensure that the hydrolysis was complete, centrifuged, washed with deionized water, dried at 100°C, calcined at 550°C for 5 hours, and cooled naturally. Ti-doped MCM-41 mesoporous mole...
Embodiment 3
[0065] Preparation of Mg-doped MCM-41 mesoporous molecular sieves:
[0066] Weigh 0.4g of MCM-41 mesoporous molecular sieve and disperse it in a beaker filled with 35mL of absolute ethanol to form solution A, stir for 30min until the solution is completely mixed; then weigh 0.11988g of anhydrous magnesium sulfate and disperse it in 15mL of In absolute ethanol, stir evenly and slowly add to solution A to make the two solutions mix, and continue to stir for 1h. During this process, heteroatoms are adsorbed on the surface of molecular sieves; then drop by drop by 5mL 0.5M dilute hydrochloric acid C solution composed of 10mL deionized water, stirred for another 2h, then added dropwise with 10mL deionized water, continued to stir for 2h to ensure complete hydrolysis, centrifuged, washed with deionized water, dried at 100°C, and calcined at 550°C for 5h. After natural cooling and grinding, Mg-doped MCM-41 mesoporous molecular sieves were obtained.
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