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Hydrothermally stable microporous molecular sieve catalyst and preparation method thereof

一种水热稳定、分子筛的技术，应用在分子筛催化剂、化学仪器和方法、物理/化学过程催化剂等方向，能够解决酸位损失、催化性能下降等问题，达到反应简单、保持催化活性、降低成本的效果

Active Publication Date: 2008-10-08
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, if a conventional water-soluble salt is used as the metal salt, a large number of metal cations generated in the catalyst preparation can be easily ion-exchanged with the protons of the zeolite, resulting in the loss of acid sites
Therefore, there is a problem in this case that the ion exchange of dissolved metal ions with the protons of the molecular sieve reduces the number of acid sites, leading to a decrease in catalytic performance.

Method used

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  • Hydrothermally stable microporous molecular sieve catalyst and preparation method thereof
  • Hydrothermally stable microporous molecular sieve catalyst and preparation method thereof
  • Hydrothermally stable microporous molecular sieve catalyst and preparation method thereof

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preparation example Construction

[0068] Although the description of the preparation of the molecular sieve catalyst is not limited to a certain theory, it is believed that, as the following reaction scheme figure 1 and 2As shown, the modification of -Si-OH-Al-groups forming molecular sieves with phosphate compound / metal composite structure is to compress them with zeolite protons so that the ≡P=O groups stabilize the unstable Al while using The metal stabilizes the two -OH groups, so that the skeleton structure can be maintained relatively stably even in an atmosphere of high temperature and high humidity:

[0069] [Reaction scheme 1]

[0070]

[0071] [Reaction scheme 2]

[0072]

[0073] The method for preparing the catalyst described in the present invention can be broadly divided into two methods, which include the step of removing the water contained in the above-mentioned raw material mixture through a selective evaporation process to collect a solid product.

[0074] The preparation method of...

Embodiment 1

[0093] (1) 9.58g concentrated phosphoric acid (85%H 3 PO 4 ) was dissolved in 200 mL of distilled water. To this solution was slowly added 3.35 g of MgO and stirred for about 20 minutes. Next, the solution was stirred at about 40°C for about 1 hour, and then at about 60°C until the water was completely evaporated. The resulting solid product was washed, filtered and isolated.

[0094] (2) 1.94 g of HZSM-5 (Zeolyst) with a Si / Al molar ratio of 25 and 0.06 g of the solid product prepared in step (1) were added to 200 mL of distilled water. The mixed solution was stirred at 50-60° C. for about 5 hours, and then the stirred solution was vacuum filtered, washed and separated, thus preparing the Mg-HPO-HZSM-5 catalyst.

Embodiment 2

[0096] (1) 19.68g concentrated phosphoric acid (85%H3 PO 4 ) was dissolved in 100 mL of distilled water. To this solution was slowly added 4.78 g of Mg(OH) 2 , stirring for about 20 minutes. Next, the solution was stirred at about 40°C for about 1 hour, and then at about 60°C until the water was completely evaporated. The resulting solid product was washed, filtered and isolated.

[0097] (2) 1.94 g of HZSM-5 (Zeolyst) with a Si / Al molar ratio of 25 and 0.06 g of the solid product prepared in step (1) were added to 100 mL of distilled water. The mixed solution was stirred at 50-60°C for about 5 hours, and then the stirred solution was vacuum filtered, washed and separated, thus preparing Mg-H 2 PO 4 - HZSM-5 catalyst.

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Abstract

Disclosed are a hydrothermally stable porous molecular sieve catalyst and a preparation method thereof. The catalyst consists of a product obtained by the evaporation of water from a raw material mixture comprising a molecular sieve having a framework of Si-OH-Al-, a water- insoluble metal salt and a phosphate compound. The catalyst maintains its physical and chemical stabilities even in an atmosphere of high temperature and humidity. Accordingly, the catalyst shows excellent catalytic activity even when it is used in a severe process environment of high temperature and humidity in heterogeneous catalytic reactions, such as various oxidation / reduction reactions, including catalytic cracking reactions, isomerization reactions, alkylation reactions and esterification reactions.

Description

【Technical field】 [0001] The present invention relates to a hydrothermally stable porous molecular sieve catalyst and a preparation method thereof, more particularly to a hydrothermally stable porous molecular sieve catalyst which has a relatively stable structure and can maintain its catalytic activity even under high-temperature and high-humidity atmosphere , and a preparation method thereof. 【Background technique】 [0002] Porous inorganic materials with -Si-OH-Al-based frameworks have been widely used in the field of porous molecular sieve catalysts due to their abundant pores, large specific surface area, and many active and acid sites. [0003] For example, this porous molecular sieve catalyst is used in heterogeneous catalytic reactions, such as various oxidation / reduction reactions, including catalytic cracking reactions, isomerization reactions, and esterification reactions, especially where thermal stability is required in harsh atmospheres with high temperature an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/85B01J29/00
CPCB01J29/061B01J29/40B01J29/405B01J29/46B01J2229/12B01J2229/18C10G29/205C10G2400/20Y02P20/52
Inventor 崔先金容昇朴德守金奭俊梁一模金希永朴镛基李哲伟崔源春高光安姜拏永
Owner SK INNOVATION CO LTD
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