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Modification method of beta-molecular sieve

A technology of β molecular sieve and molecular sieve, which is applied in the field of phosphorus and transition metal modification of β molecular sieve, can solve the problems of structural damage, easy dealumination, activity stability, etc., achieve high relative crystallinity, improve olefin selectivity, and avoid damage Effect

Active Publication Date: 2009-06-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In use, the main problem of β molecular sieve is that on the one hand, its structure is easily damaged during the process of removing its template agent, on the other hand, it is easy to dealuminate during the reaction process, so the activity stability is poor

Method used

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  • Modification method of beta-molecular sieve
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  • Modification method of beta-molecular sieve

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Effect test

Embodiment 1

[0031] 100g (dry basis) β molecular sieve (produced by Qilu Catalyst Factory) was mixed with NH 4 Cl solution exchange wash to Na 2 O content is lower than 0.2% by weight, filters to obtain filter cake; Add 6.8gH 3 PO 4 (Concentration 85%) and 4.8gCu(NO 3 ) 2 ·3H 2 O was dissolved in 90g of water, then 25% ammonia water was added to adjust the pH to 6, and the impregnating solution was evenly mixed with the filter cake, impregnated and dried; the obtained sample was calcined at 550°C for 2 hours, that is, the molecular sieve provided by the present invention.

[0032] The chemical composition of elemental analysis is: 0.1Na 2 O 8.2Al 2 o 3 4.0P 2 o 5 1.0CuO 86.7SiO 2 .

Embodiment 2

[0034] 100g (dry basis) β molecular sieve (produced by Qilu Catalyst Factory) was mixed with NH 4 Cl solution exchange wash to Na 2 O content is lower than 0.2% by weight, filters to obtain filter cake; Add 6.8gH 3 PO 4 (Concentration 85%) and 4.8gCu(NO 3 ) 2 ·3H 2 O was dissolved in 90g of water, then 25% ammonia water was added to adjust the pH to 7, and the impregnating solution was evenly mixed with the filter cake, impregnated and dried; the obtained sample was calcined at 550°C for 2 hours, that is, the molecular sieve provided by the present invention.

[0035] The chemical composition of elemental analysis is: 0.1Na 2 O 8.2Al 2 o 3 4.0P 2 o 5 1.0CuO 86.7SiO 2 .

Embodiment 3

[0037] 100g (dry basis) β molecular sieve (produced by Qilu Catalyst Factory) was mixed with NH 4 Cl solution exchange wash to Na 2 O content is lower than 0.2% by weight, filters to obtain filter cake; Add 6.8gH 3 PO 4 (Concentration 85%) and 4.8gCu(NO 3 ) 2 ·3H 2 O was dissolved in 90g of water, and then 25% ammonia water was added to adjust the pH=8, and the impregnating solution was uniformly mixed with the filter cake, impregnated and dried; the obtained sample was roasted at 550°C for 2 hours, which was the molecular sieve provided by the present invention.

[0038] Elemental analysis chemical composition is 0.1Na 2 O 8.2Al 2 o 3 4.0P 2 o 5 1.0CuO 86.7SiO 2 .

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Abstract

The invention discloses a method for modifying beta molecular sieves, which is characterized in that sodium beta molecular sieves are exchanged for 0.3 to 1 hour between room temperature and 100 DEG C according to the fact that the weight ratio of the molecular sieves to ammonium salts to H2O is 1:0.1-1:5-10, filtered and impregnated into a phosphorus-containing compound solution and a solution containing transition metal compounds for modification, and dried and roasted, wherein the pH value of an impregnating solution is adjusted to be between 6 and 8. The beta molecular sieves containing phosphorus and transition metals obtained by the modification method have higher specific surface area and relative crystallinity; and when the beta molecular sieves are applied as an active ingredient of a catalyst or an auxiliary agent during catalytic cracking of petroleum hydrocarbon, the olefin selectivity of the beta molecular sieves is further improved, so that more olefin raw materials can be provided for generation of low-carbon olefins by further shape selective cracking of the shape selective molecular sieves.

Description

technical field [0001] The invention relates to a method for modifying a β molecular sieve, and more particularly relates to a method for modifying a β molecular sieve with phosphorous and transition metals. Background technique [0002] In 1967, Wadlinger of Mobile Company first used sodium aluminate, silica gel, tetraethylammonium hydroxide (TEAOH) and water to crystallize and synthesize β molecular sieve. Modulation in the range of tens to hundreds. Martens et al. used decane as a probe reaction to reveal the skeleton structure of the 12-membered ring hole of β molecular sieves; in 1988, Newsam and Higgins et al. used structural models and simulated powder diffraction to determine the stacking fault structure of β molecular sieves for the first time. β molecular sieve has a 12-membered ring intersecting channel structure, the 12-membered ring of the one-dimensional channel parallel to the (001) crystal plane has a pore size of 0.75-0.57nm, and the other 12-membered ring ...

Claims

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Application Information

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IPC IPC(8): B01J29/064B01J37/28
Inventor 欧阳颖罗一斌舒兴田王永睿庄立田素贤
Owner CHINA PETROLEUM & CHEM CORP
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