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A kind of preparation method of multistage pore Y molecular sieve

A molecular sieve and channel technology, applied in the field of molecular sieve synthesis, can solve the problems of reducing the crystallinity and silicon-aluminum ratio of molecular sieves, destroying the crystal structure of molecular sieves, etc., and achieve the effects of low acid density, high specific surface area, and excellent non-polarity

Active Publication Date: 2021-05-18
TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of alkali treatment to create mesopores will seriously damage the crystal structure of molecular sieves, and reduce the crystallinity and silicon-aluminum ratio of molecular sieves obtained after chemical treatment, especially the silicon-aluminum ratio of the surface layer of molecular sieves.

Method used

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  • A kind of preparation method of multistage pore Y molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 50g NaY molecular sieve (silicon-aluminum ratio 5.6), add 250g 1mol / L NaOH solution, place in a 90°C water bath and stir rapidly for 1 h, take out the sample, and wash it with deionized water until PH<8.

[0032] Get the dried sample that 10g has processed and place in the quartz tube reactor, in the N of 40ml / min 2 Under the purging speed, the temperature was raised to 600°C at a rate of 3°C / min and kept for 120min. Then set the temperature to 450°C, switch N when the temperature drops to 450°C 2 SiCl 4 saturated N 2 (i.e. N2 slowly bubbled through SiCl 4 solution), where N 2 The flow rate is 40ml / min and maintained for 120min. Then switch the gas to pure N 2 , after purging for 120min, it naturally cooled to room temperature, and the sample was taken out. The removed sample was washed with deionized water, dried, and the above SiCl 4 Dealumination and silicon supplementation step.

[0033] Prepare 50 g of hydrochloric acid and ammonium chloride mixed so...

Embodiment 2

[0036] The molecular sieve was processed according to the steps described in Example 1, the difference being that the concentration of lye was reduced from 1mol / L to 0.75mol / L. The characterization results of the final samples are shown in Table 1.

Embodiment 3

[0038] The molecular sieve was treated according to the steps described in Example 2, the difference being that the alkali treatment time was increased from 1h to 2h. The characterization results of the final samples are shown in Table 1.

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Abstract

The invention discloses a method for preparing a multi-stage pore Y molecular sieve, which relates to the field of molecular sieve synthesis; specifically, it comprises the steps of: pre-preparing a Y-type molecular sieve with a silicon-aluminum ratio of 4-6:1 in an alkaline solution at 20-150°C. Processing; under anhydrous conditions, use an inert gas to carry SiCl 4 and / or SiHCl 3 Steam reacts with pretreated molecular sieves to dealuminate and replenish silicon; then treat with ammonium ion solution at 60-120°C for 0.1-3h; then roast, wash, and dry to finally obtain multi-stage channel Y-type molecular sieves; this invention adopts alkali treatment and chemical The combination of the method and method does not destroy the structure of the molecular sieve. The obtained molecular sieve has a high specific surface area and crystallinity. The prepared multi-stage channel Y molecular sieve has a silicon-aluminum ratio of 20-160; the generated secondary pores are interconnected, and the channels The diameter can be adjusted between 2-50μm according to the alkali treatment conditions; the relative crystallinity of molecular sieves is >70%.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve synthesis, in particular to a method for preparing a multi-stage channel Y molecular sieve. Background technique [0002] Y-type molecular sieve has extremely high specific surface area, suitable acidity and large pore diameter, so that it has good adsorption diffusion performance and acid catalytic performance, and can allow macromolecules to enter and exit the pores for reaction. Since it was first used in industrial catalysis in the 1960s, it has gradually become the main active component of catalytic cracking, hydrocracking, alkylation, isomerization and other reactions, and has become the most widely used molecular sieve catalyst in the field of catalysis in the world. [0003] Generally, the silicon-aluminum ratio of industrially synthesized Y molecular sieves is lower than 6:1, and the high aluminum content leads to excessively high acid density and poor hydrothermal stability. Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
CPCC01B39/24
Inventor 窦涛谭富江
Owner TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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