Modified nay molecular sieve and its preparation method and application, as well as carrier and application of hydroprocessing catalyst
A molecular sieve and modification technology, applied in the direction of molecular sieve catalyst, catalyst carrier, physical/chemical process catalyst, etc., can solve the problems of short service life, low catalytic activity of catalyst, easy blockage of molecular sieve carrier, etc., and achieve the effect of reducing the probability of blockage.
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[0014] The invention provides a preparation method of NaY molecular sieve, which comprises: contacting NaY molecular sieve with organic acid in aqueous solvent to obtain modified NaY molecular sieve, wherein the shape of the opening of the modified NaY molecular sieve is trumpet.
[0015] According to the method of the present invention, the grain size of the modified NaY molecular sieve may be 100-500 nm, preferably 200-400 nm. The modified NaY molecular sieve within this grain size range stabilizes the framework of the molecular sieve. The specific surface area of the modified NaY molecular sieve is 700-750m 2 / g, preferably 710-740m 2 / g; the pore volume of the modified NaY molecular sieve is 0.4-0.5ml / g; preferably 0.43-0.49ml / g. And the catalyst synthesized by using the molecular sieve can be well regenerated and used.
[0016] According to the method of the present invention, in order to obtain the modified NaY molecular sieve, the preferred embodiment of the presen...
Embodiment 1
[0039] (1) At a temperature of 20°C, according to the molar ratio of 18Na 2 O: Al 2 o 3 :20SiO2 2 :300H 2 O, mix sodium aluminate, sodium hydroxide, and deionized water, and stir to dissolve them completely. Under the condition of stirring, slowly add water glass into the completely dissolved sodium aluminate solution, continue to stir for 30 minutes, seal it, let it stand for aging, and obtain the directing agent.
[0040] (2) According to the molar ratio is 5Na 2 O: Al 2 o 3 :10SiO2 2 :200H 2 O, mix sodium aluminate, sodium hydroxide, and deionized water, stir to make it dissolve completely, then add Tween 20 (Tween 20 and Al 2 o 3 The molar ratio is 0.2:1), stirred to make it dissolve completely, and a mixed solution was obtained.
[0041] (3) At room temperature, add water glass to the above-mentioned mixed solution, stir at high speed for 30 minutes, then add the above-mentioned directing agent, continue stirring for 60 minutes, put the obtained silica-alumina ge...
Embodiment 2
[0044] The carrier was prepared according to the method of Example 1, except that: the temperature in step (1) was replaced by 25°C from 20°C, and the stirring time was replaced by 40 minutes from 30 minutes; in step (3), the heating temperature of 90°C was replaced by 100°C; In step (4), the temperature was replaced from 70°C to 80°C, 13 grams of acetic acid was replaced by 17 grams of acetic acid, the pH value was replaced from 3 to 4, and the reaction was replaced for 3 hours by 4 hours to obtain the modified NaY molecular sieve carrier B. Its shape is trumpet-shaped observed by scanning electron microscope, and its grain size is 300nm by laser particle size analyzer. The properties of carrier B are shown in Table 1.
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