Preparation method of SUZ-4 molecular sieve

A SUZ-4, molecular sieve technology, applied in molecular sieve compounds, molecular sieve characteristic silicates, chemical instruments and methods, etc., can solve the problems of high price and unenvironmental protection, and achieve reduced preparation costs, low procurement costs, and mature synthesis technology. Effect

Active Publication Date: 2021-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, most of the synthesis methods of SUZ-4 molecular sieves are further synthesized by using expensive, non-environmentally friendly organic templates and the seeds or seed crystals produced during the synthesis process of SUZ-4 molecular sieves. Related reports on the synthesis of SUZ-4 molecular sieves from secondary structural units

Method used

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  • Preparation method of SUZ-4 molecular sieve
  • Preparation method of SUZ-4 molecular sieve
  • Preparation method of SUZ-4 molecular sieve

Examples

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Effect test

Embodiment 1

[0027]Aluminum sheet, potassium hydroxide, silica sol (26.5% SIO2) And water according to the molar ratio SIO2: Al2O3: Koh: h2O = 16.5: 1: 11.5: 585.0 Add to the beaker, the HZSM-5 molecular sieve is added to 9% of the total mass of the initial gel mixture synthesized SUZ-4 molecular sieve, stirred for 2 hours, the solution is uniform, and the reaction reaction is loaded. The kettle was placed in a dynamic crystallization of 150 ° C for 3 days (rotational speed of 20R / min). After removing the reactor, it was quickly cooled to room temperature with cold water, and the resulting mixture was separated. The resulting solid sample was dried at 110 ° C for 24 hours to obtain a SUZ-4 molecular sieve, and no heterocrystallization, the relative crystallinity was 96%.

Embodiment 2

[0029]Example 1 was repeated, but with white carbon black as a silicon source, the amount of deionized water was reduced. In this embodiment, aluminum sheet, potassium hydroxide, silica sol and water are in accordance with the molar ratio SiO2: Al2O3: Koh: h2O = 27.5: 1.5: 12.8: 765.0 Add to the beaker, the HzSM-5 molecular sieve is added to 6.5% of the total mass of the initial gel mixture synthesizing the SUZ-4 molecular sieve, stirred for 2 hours, the solution is uniform, and the reaction reaction is loaded. Dynamic crystallization of 170 ° C for 2 days (20R / min) was placed. After removing the reactor, it was rapidly cooled to room temperature after removal of the reaction, and the resulting mixture was filtered to be separated, and the solid Suz-4 molecular sieve was obtained at 110 ° C for 24 hours, and did not contain a heteroid crystal, and the relative crystallinity was 98%.

Embodiment 3

[0031]Example 1 was repeated, but alumina as an aluminum source, alumina, potassium hydroxide, silica sol (26.5% SiO2) And water according to the molar ratio SIO2: Al2O3: Koh: h2O = 18.8: 1.8: 1: 6.5: 500.0 Add to the beaker, the HZSM-5 molecular sieve is added to 14% of the total mass of the initial gel mixture synthesized SUZ-4 molecular sieve, stirred for 2 hours, solution liquid into a uniform state, After the reactor was placed at 160 ° C for 3 days (20 r / min) to obtain a SUZ-4 molecular sieve containing no heterocrystalline, the relative crystallinity was 96%.

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Abstract

The invention discloses a preparation method of an SUZ-4 type molecular sieve, which comprises the following steps: mixing an aluminum source, a silicon source, an alkali source, deionized water and an HZSM-5 type molecular sieve, and performing crystallization, filtration and drying to obtain the SUZ-4 type molecular sieve. The method does not need a template agent, is low in preparation cost and is suitable for industrial application.

Description

Technical field[0001]The present invention belongs to the field of molecular sieves, and is specifically a method of preparing a SUZ-4 molecular sieve.Background technique[0002]SUZ-4 molecular sieves are similar to ZSM-5, FER molecular sieved structure, and the three-dimensional holes are mainly composed of four, five, six, eight and ten-membered rings, including parallel to XY planes and apertures consisting of eight-membered ring. Ten yuan ring composition is parallelzTwo cross hole in the straight hole of the axis. The SUZ-4 molecular sieve has been used in a plurality of catalytic sectors such as n-butylene and selective catalytic reduction nitrogen oxides, and has potential industrial application prospects.[0003]At present, conventional methods of synthetic SUZ-4 have been reported to add a large amount of price expensive organic template for about 4-7 days at higher temperatures (usually 150-180 ° C). This makes the SUZ-4 molecular sieves unable to carry out large-scale produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02C01B37/00
CPCC01B39/02C01B37/005C01P2002/72C01P2004/03
Inventor 高杭杜艳泽秦波柳伟张晓萍
Owner CHINA PETROLEUM & CHEM CORP
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