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Preparation method of high-crystallinity and high-silica-alumina-ratio modified Y-type molecular sieve

A technology with high silicon-aluminum ratio and high crystallinity, applied in crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, separation methods, etc., can solve the problem of difficult balance between silicon-aluminum ratio secondary pore volume and crystallinity, etc. problems, to achieve the effect of excellent hydrophobicity, mild treatment conditions and high crystallinity

Inactive Publication Date: 2019-09-06
TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the deficiencies in the prior art, and provides a high crystallinity and high silicon-aluminum ratio for the problems of silicon-aluminum ratio, secondary pore volume and crystallinity in the existing Y-type molecular sieve modification technology. Preparation method of modified Y-type molecular sieve; under the premise of maintaining high crystallinity, a modified Y-type molecular sieve with more abundant secondary pores and higher silicon-aluminum ratio is obtained

Method used

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  • Preparation method of high-crystallinity and high-silica-alumina-ratio modified Y-type molecular sieve
  • Preparation method of high-crystallinity and high-silica-alumina-ratio modified Y-type molecular sieve
  • Preparation method of high-crystallinity and high-silica-alumina-ratio modified Y-type molecular sieve

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Embodiment 1

[0026] Add Y-type molecular sieve to NH with a pH value of 8.2 at a mass ratio of 1:12 3 ·H 2 O-NH 4 In the Cl buffer system, sealed and stirred at 25°C for 300min, then filtered, and washed with deionized water 1 times the mass of the buffer system to obtain a filter cake; In the acetic acid-ammonium acetate buffer system, it was sealed and stirred at 55°C for 720min, then filtered, washed with deionized water 1 times the mass of the buffer system, finally dried at 100°C for 12h, and roasted at 500°C for 6h to obtain the modified Y Type molecular sieve, number S1, its properties are shown in Table 1.

Embodiment 2

[0028] Add Y-type molecular sieve to Na with a pH value of 12 by mass ratio 1:3 2 CO 3 -NaHCO 3 In the buffer system, seal and stir at 45°C for 50 minutes, then filter, wash with deionized water 3 times the mass of the buffer system to obtain a filter cake; add the above filter cake to nitric acid with a pH value of 2.5 at a mass ratio of 1:35 - In the ammonium nitrate buffer system, stir at 95°C for 350 minutes, then filter, wash with deionized water 3 times the mass of the buffer system, dry at 120°C for 6 hours, and roast at 600°C for 3 hours to obtain the modified Y type Molecular sieve, number S2, its properties are shown in Table 1.

Embodiment 3

[0030] Add Y-type molecular sieve to NaOH-Na with a pH value of 11 at a mass ratio of 1:6 2 HPO 4 In the buffer system, seal and stir at 35°C for 150 minutes, then filter, wash with deionized water twice the mass of the buffer system to obtain a filter cake; add the above filter cake to sulfuric acid with a pH value of 5.5 at a mass ratio of 1:25 -Aluminum sulfate system buffer system, sealed and stirred at 75°C for 580min, then filtered, washed with deionized water 2.5 times the mass of the buffer system, finally dried at 110°C for 8h, and roasted at 550°C for 4h to obtain modification Y-type molecular sieve, number S3, its properties are shown in Table 1.

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Abstract

The invention relates to a preparation method of a high-crystallinity and high-silica-alumina-ratio modified Y-type molecular sieve. The preparation method comprises the following steps that a Y-typemolecular sieve is added into an alkaline buffer solution, and after uniform stirring is carried out, slight alkali treatment is carried out; Y-type molecular sieve slurry after slight alkali treatment is filtered and washed to obtain a Y molecular sieve filter cake; the Y molecular sieve filter cake is added into an acidic buffer solution, and after uniform stirring is carried out, deep acid treatment is carried out; finally, solid-liquid separation, washing, drying and roasting are carried out to obtain the modified Y-type molecular sieve. The method has the advantages that the buffer solutions are used for treating the Y-type molecular sieve, the conditions are mild, and the treatment depth of the buffer solutions is controlled, so that the modified Y-type molecular sieve maintains higher crystallinity, and the modified Y-type molecular sieve has richer secondary pores and a higher silica-alumina ratio, thereby greatly improving the catalytic cracking performance of the Y-type molecular sieve; meanwhile, the prepared Y-type molecular sieve shows excellent hydrophobicity.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve synthesis, in particular to a method for preparing a modified Y-type molecular sieve with high crystallinity and high silicon-aluminum ratio. Background technique [0002] Y-type molecular sieve is formed by faujasite cages interpenetrating with each other along three crystal axis directions through twelve-membered rings. It is an excellent catalytic active component with high cracking activity and good selectivity. Y-type molecular sieves have been the main active component of catalytic cracking (FCC) catalysts since they were first used in the 1960s. Due to its excellent hydrophobicity, high specific surface area and adsorption capacity, the high-silicon Y-type molecular sieve is an ideal material to replace activated carbon as a VOCs adsorbent. [0003] In the actual application process, due to its low silicon-aluminum ratio and poor hydrothermal stability, the Y-type molecular sieve r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24B01J29/08B01J20/16B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2253/10B01D2257/708B01J20/16B01J20/28002B01J29/084B01J2229/16C01B39/24
Inventor 窦涛谭富江
Owner TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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