Preparation method of MCM-22 (Multiple Chip Module 22)/silicon-oxide compound
A technology of MCM-22 and silicon oxide, applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve the problems of low mechanical strength, low production efficiency, and difficult interconnection, etc., and achieve low price, The effect of simple reaction conditions and mature technology
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Embodiment 1
[0032] Synthesis of MCM-22 molecular sieves. Add silica sol, sodium hydroxide, sodium aluminate, and hexamethyleneimine (HMI) into the beaker in a certain proportion and order, and the reaction mixture consists of n(SiO 2 ):n(Al 2 o 3 ):n(HMI):n(NaOH):n(H 2 (0)=1: 0.04: 0.12: 0.35: 20, stir evenly and pack into a 500mL dynamic stainless steel reactor. The stirring speed was 100 rpm, the reaction temperature was 170° C., and the crystallization time was 62 hours. After the reaction, the samples were taken out, washed repeatedly, and filtered with suction until the pH of the washing liquid was close to 7. Put the filtered white paste product in an oven at 100°C and dry it for 24 hours to obtain the MCM-22 precursor. The precursor was then placed in a muffle furnace at a heating rate of 2°C / min, and calcined at 550°C for 6 hours in an air atmosphere to remove the template agent to obtain the MCM-22 molecular sieve.
Embodiment 2-4
[0034] Synthesis of MCM-22 / silica complexes. First, 10 g of the MCM-22 molecular sieve prepared in Example 1 was uniformly dispersed in 100 g of distilled water, then 1 g of phenol was added to the suspension under stirring, and after stirring for 30 minutes, 1.5 g of phenol was added to the mixture Containing 5% sodium hydroxide and 25% tetraethylammonium hydroxide aqueous solution, stir well and then add 10 grams of tetraethyl orthosilicate (TEOS), then add dropwise the equivalent of phenol molar amount in the mixed solution 2 times the formaldehyde. After stirring evenly, the temperature was slowly raised to 75°C under continuous stirring until a thick gel was formed; after the gel was aged at 75°C for 24 hours, it was transferred to an autoclave for hydrothermal treatment at 130°C for 12 hours. After the hydrothermal reaction, the product was separated, dried, and calcined at 500° C. for 10 hours in an air atmosphere to obtain the MCM-22 / silicon oxide composite, which was...
Embodiment 5-7
[0037] Synthesis of MCM-22 / silica complexes. First, 10 g of MCM-22 molecular sieves prepared in Example 1 were evenly dispersed in distilled water, then 1.2 grams of phenol was added to the suspension under stirring, and after stirring for 30 minutes, 1.5 grams of phenol was added to the mixture. Containing 8% sodium carbonate and 25% tetrapropyl ammonium hydroxide aqueous solution, after stirring evenly, add 8 grams of tetramethyl orthosilicate (TMOS), and then add dropwise the equivalent of phenol molar amount in the mixed solution 1.5 times the formaldehyde. After stirring evenly, the temperature was slowly raised to 80° C. under continuous stirring until a thick gel was formed; the gel was aged at 80° C. for 12 hours, and then dried at 120° C. for 10 hours. Afterwards, transfer to an autoclave for hydrothermal treatment at 180° C. for 24 hours. After the hydrothermal reaction, the product was separated, dried, and calcined at 600° C. for 5 hours in an air atmosphere to o...
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