A preparation method of ti-mg-zr mixed doped MCM-41 mesoporous molecular sieve
A technology of MCM-41 and mesoporous molecular sieve, which is applied in the direction of molecular sieve compounds, molecular sieves and base exchange compounds, chemical instruments and methods, etc. It can solve the problems of narrow use, poor hydrothermal stability, and poor catalytic performance, etc.
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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 a mixed solution A, stir for 30min until the mixed solution is completely mixed; then weigh 0.07947g of titanium dioxide and disperse it in a 15mL In water and ethanol, after stirring evenly, slowly add to the mixed solution A to make the mixture evenly, and continue to stir for 1h. During this process, the heteroatoms are adsorbed on the surface of the molecular sieve; Solution C composed of deionized water, stirred for another 2 hours, then added dropwise 10mL of deionized water, continued to stir for 2 hours to ensure complete hydrolysis, centrifuged, washed with deionized water, dried at 100°C, calcined at 550°C for 5h, and cooled naturally , Ti-doped MCM-41 mesoporous molecular sieves were obtained after grinding.
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 a mixed solution A, stir for 30min until the mixed solution is completely mixed; then weigh 0.11988g of anhydrous magnesium sulfate and disperse it in In 15mL of absolute ethanol, stir evenly and slowly add to the mixed solution A to make the mixture evenly, and continue to stir for 1h. During this process, the heteroatoms are adsorbed on the surface of the molecular sieve; Solution C composed of hydrochloric acid and 10 mL of deionized water, stirred for 2 hours, then added dropwise with 10 mL of deionized water, continued to stir for 2 hours to ensure complete hydrolysis, centrifuged, washed with deionized water, dried at 100°C, and calcined at 550°C for 5 hours , natural cooling, and grinding to obtain Mg-doped MCM-41 mesoporous molecular sieves.
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