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Preparation method of high-silicon Y-type molecular sieves

A molecular sieve and high-silicon technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of large loss of crystallinity of molecular sieve, difficult to achieve silicon-aluminum ratio, complicated preparation process, etc., to achieve Improve the ion exchange rate, increase the silicon-aluminum ratio, and improve the modification effect

Active Publication Date: 2020-03-06
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0004] Chinese patent CN1065253A discloses a preparation method of high-silicon Y zeolite, in which chemical dealumination-hydrothermal treatment is used alternately, the obtained molecular sieve has a large loss of crystallinity, and the silicon-aluminum ratio is difficult to reach more than 30
It must go through the above two processes of desodination and dealumination, especially the hydrothermal treatment and gas phase modification require high equipment and the preparation process is relatively complicated

Method used

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  • Preparation method of high-silicon Y-type molecular sieves

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Effect test

example 1

[0018] Weigh 100g of raw material NaY molecular sieve (produced by Nankai Catalyst Factory, the same below), add 500ml of oxalic acid-ammonium chloride buffer solution (oxalic acid:ammonium chloride:water = 1g:10g:50ml), and stir at 90℃ 5.5h, filter, beat and wash with deionized water, and dry. Then put the obtained Y molecular sieve into a muffle furnace at a temperature of 600 ℃ and roast for 6 hours; repeat the above process once, but the buffer solution of oxalic acid-ammonium chloride (oxalic acid: ammonium chloride: water = 2g:10g:50ml) is selective The Y zeolite for ammonium exchange and removal of part of the framework aluminum; take 50g of the above two-by-two-baked zeolite, add 750ml of 0.5mol / L nitric acid, stir at 80℃ for 3h, filter, beat and wash with deionized water, dry, and then Put the obtained Y molecular sieve into a muffle furnace at a temperature of 600° C. and roast for 6 hours to obtain a high-silicon modified Y molecular sieve. Its physical and chemical...

example 2

[0020] Weigh 100g of the raw material NaY molecular sieve, add 500ml of the prepared citric acid-ammonium nitrate buffer solution (citric acid: ammonium nitrate: water = 2g:6g:50ml), stir at 80℃ for 5.5h, filter, and use deionized water Beating, washing, and drying. Then put the obtained Y molecular sieve into a muffle furnace at a temperature of 800℃ and roast for 4h; repeat the above process once, but the buffer solution of citric acid-ammonium nitrate (citric acid:ammonium nitrate:water=4g:6g:50ml) is selective The Y zeolite for ammonium exchange and removal of part of the framework aluminum; take 50g of the above two-by-two-baked zeolite, add 750ml of 1mol / hydrochloric acid, stir at 80℃ for 6h, filter, wash with deionized water, and dry, and then the obtained The Y molecular sieve is put into a muffle furnace at a temperature of 800° C. and roasted for 4 hours to obtain a high-silicon modified Y molecular sieve. Its physical and chemical properties are listed in Table 1.

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Abstract

The invention discloses a preparation method of high-silicon Y-type molecular sieves, and belongs to the technical field of microporous materials. The high-silicon Y-type molecular sieves are preparedby taking a commercial NaY molecular sieve as a raw material and adopting a chemical dealumination-high-temperature roasting alternated use method. Some organic acids, inorganic acids and inorganic salts can be selected as dealumination agents for chemical dealumination, but the types of the acids need to be selected according to the dealumination sequence. Compared with the prior art, the NaY molecular sieve treatment process of the method has the advantages of simple process, low equipment requirement, good modification effect and the like, and can be used for preparing the modified high-silicon Y molecular sieves with various property requirements.

Description

Technical field [0001] The invention belongs to the technical field of microporous materials, and specifically relates to a method for preparing a high-silicon Y-type molecular sieve. The material has broad application prospects in organic pollution removal, adsorption separation and catalysis. Background technique [0002] Y-type molecular sieves have been widely used in industry to prepare catalysts or catalyst supports for different acid catalytic reactions such as catalytic cracking, hydrocracking, isomerization and alkylation. Directly hydrothermally synthesized Y-type molecular sieve, the cation outside the framework is usually Na + , And NaY molecular sieve does not have acid catalytic activity, so when used to prepare acid catalytic reaction catalyst, most of Na must be removed + . When the degree of sodium removal is not very high, ion exchange technology can be used to achieve one or several ion exchanges. However, when the degree of sodium removal is required to be hi...

Claims

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Application Information

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IPC IPC(8): C01B39/24
CPCC01B39/24
Inventor 张傑高君安李英霞
Owner BEIJING UNIV OF CHEM TECH
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