Alkali treatment modifying method of Y-shaped molecular sieve

A molecular sieve and alkali treatment technology, applied in the field of molecular sieve, achieves good industrial application prospects, improves ion exchange efficiency, and has the effects of fast diffusion

Active Publication Date: 2010-06-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore do not adopt the alkali treatment desilication method to directly process the research rep

Method used

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  • Alkali treatment modifying method of Y-shaped molecular sieve

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Experimental program
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Effect test

Embodiment 1

[0039] Weigh 30 grams of sodium hydroxide and dissolve in 970 grams of distilled water, stir evenly and heat up to 85°C. Get 200 grams of NaY molecular sieves (sample name Y-A; crystallinity: 95%; skeleton silicon-aluminum ratio: 6.15; bulk phase silicon-aluminum ratio: 6.24; surface silicon-aluminum ratio: 5.12; Na 2 O: 12.1% by weight; N 2 Adsorption capacity: 295.01cc / g; water adsorption capacity 295mg / g; self-synthesized according to the method described in patent CN 1785808), added to the above alkali solution, stirred at 85°C for 2 hours, filtered, washed, and dried. Obtain alkali treatment sample (measurement result is: crystallinity: 92%; Skeleton silicon-aluminum ratio: 5.43; Bulk phase silicon-aluminum ratio: 5.56; Surface silicon-aluminum ratio: 4.72; Na 2 O: 12.0% by weight; N 2 Molecular adsorption: 323.08cc / g; water adsorption: 320mg / g).

[0040] Under the same conditions, the water adsorption capacity of ordinary NaY molecular sieves with a skeleton silicon-a...

Embodiment 2

[0043] Take 30 grams of the alkali-treated product in Example 1, add it into 300 grams of distilled water together with 30 grams of ammonium chloride, stir evenly, and then stir and exchange at 90° C. for 1 hour. During the exchange process, 1mol / L hydrochloric acid solution was used to adjust the pH value of the exchange slurry to 3.0 and maintain it. After the exchange is completed, filter and wash, the Na in the obtained ammonium exchange product 2 O residual amount was 4.3% by weight.

Embodiment 3

[0048] Weigh 40 grams of sodium hydroxide and dissolve it in 960 grams of distilled water. Stir evenly and heat up to 65°C. Take 150 grams of NaY molecular sieve Y-A described in Example 1 and add it to the above prepared alkali solution, and stir at 65°C. After 3 hours, filter, wash with deionized water until the pH of the filtrate = 10, collect the obtained filter cake, and dry it for future use.

[0049] Take 30 grams of the NaY molecular sieve sample that has been treated with the above alkali and add 30 grams of ammonium chloride to 300 grams of distilled water and stir evenly, then stir and exchange at 90°C for 1 hour, filter, repeat the above exchange process twice, and filter the sample And fully washed with water, the Na in the obtained ammonium ion exchange sample 2 O residual amount was 2.0% by weight.

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Abstract

The invention provides an alkali treatment modifying method of a Y-shaped molecular sieve, which comprises the following steps of: beating and uniformly mixing the Y-shaped molecular sieve and a strong alkali aqueous solution according to the mass ratio of the molecular sieve, a strong alkali and distilled water as (0.1-2): (0.05-2): (4-15), and carrying out alkali treatment for 0.1-24 hours at the temperature of 0-120 DEG C; compared with a parent Y-shaped molecular sieve, the obtained molecular sieve has the advanced performance of higher N2 adsorptive capacity, larger water absorbing capacity and the like. On the basis of modified treatment, the invention also provides a preparation method of an NH4 molecular sieve and an ultrastable Y-shaped molecular sieve, which comprises ammonium exchange treatment and hydrothermal ultrastable treatment implemented for a modified NaY molecular sieve after alkali treatment, and the obtained NH4 molecular sieve has lower metallic ion residues; an obtained USY molecular sieve has more abundant secondary holes while keeping high degree of crystallinity, thereby improving the catalytic activity of the USY molecular sieve.

Description

technical field [0001] The present invention relates to a method for modifying Y-type molecular sieves, and more specifically to a method for modifying Y-type molecular sieves with an alkaline solution for desiliconization of the skeleton, and a related preparation method for modified Y-type molecular sieves, belonging to molecular sieves technology field. Background technique [0002] Y-type molecular sieve is a microporous crystal material with regular skeleton structure. It is based on sodalite cages and arranged in three-dimensional space according to the structure of diamonds. Each sodalite cage uses its four six-membered rings in the direction of the vertices of the regular tetrahedron to connect with its adjacent sodalite cages. The gabions are connected to each other, thus forming the crystal structure of Y molecular sieve. Inside the crystal, a three-dimensional channel system is formed by crystal caves, crystal pores and channels. The internal structure of the sk...

Claims

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Application Information

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IPC IPC(8): B01J29/08
Inventor 申宝剑覃正兴高雄厚王宝杰秦松赵红娟庞新梅张君屹刘从华谢帅郭慧郭巧霞曾鹏晖孙国峰申伟王国峰林枫赵晓争主明烨
Owner BC P INC CHINA NAT PETROLEUM CORP
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