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Method for preparing silicoaluminophosphate (SAPO)-34 molecular sieve molded catalyst, product prepared by method and application of product

A SAPO-34 and catalyst technology, which is applied in the field of preparing SAPO-34 molecular sieve shaped catalysts to achieve the effects of protecting the ecological environment, saving equipment investment and reducing extra-molecular diffusion resistance

Active Publication Date: 2010-11-17
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although montmorillonite has been used as a silicon source in the synthesis of other molecular sieves, there has been no report on the synthesis of silicoaluminophosphate molecular sieves using montmorillonite as a silicon source.

Method used

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  • Method for preparing silicoaluminophosphate (SAPO)-34 molecular sieve molded catalyst, product prepared by method and application of product
  • Method for preparing silicoaluminophosphate (SAPO)-34 molecular sieve molded catalyst, product prepared by method and application of product
  • Method for preparing silicoaluminophosphate (SAPO)-34 molecular sieve molded catalyst, product prepared by method and application of product

Examples

Experimental program
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Effect test

Embodiment 1

[0104] Add 4.23g of montmorillonite to 25ml of 0.2M NaOH solution. The montmorillonite was activated in alkaline solution for 4h. Weigh 30 g of triethylamine, add it into the above solution, and react the triethylamine with the silicon in the activated solution or the silicon source on the surface of the activated montmorillonite. Dissolve 9g of pseudo-boehmite in 18g of water, add the pseudo-boehmite slurry into the mixed solution of montmorillonite and triethylamine, and stir for 30 minutes. Take 14.61g of 85% phosphoric acid, add it to the above solution, and stir for 2h. After the crystallization stock solution was aged for 2 hours, it was hydrothermally crystallized at 200°C for 72 hours. After chilling, filter, wash, dry, and activate by roasting at 600°C for 4h. The XRD characterization results showed that the obtained product was a silicoaluminophosphate molecular sieve.

[0105] figure 2 XRD spectrum of SAPO-34 molecular sieve synthesized in situ from montmorill...

Embodiment 2

[0109] Add 4.23g of montmorillonite to 25ml of 0.2M NaOH solution. The montmorillonite was activated in alkaline solution for 4h. Weigh 30 g of triethylamine, add it into the above solution, and react the triethylamine with the activated solution silicon or surface silicon. Dissolve 9 g of pseudo-boehmite in 18 g of water, add the slurry of pseudo-boehmite into the activated montmorillonite solution, and stir for 30 minutes. Weigh 14.61 g of 85% phosphoric acid, add to the above solution, and stir for 2 h. After the crystallization stock solution was aged for 2 hours, it was poured into a hydrothermal crystallization kettle, and hydrothermally crystallized at 200° C. for 48 hours. After chilling, filter, wash, dry, and activate by roasting at 600°C for 4h. XRD characterization results showed that the obtained product was SAPO-34 molecular sieve.

Embodiment 3

[0111] Add 4.23g of montmorillonite to 25ml of 0.2M NaOH solution. The montmorillonite was activated in alkaline solution for 4h. Weigh 30 g of triethylamine, add it into the above solution, and react the triethylamine with the activated solution silicon or surface silicon. Dissolve 9 g of pseudo-boehmite in 18 g of water, add the slurry of pseudo-boehmite into the activated montmorillonite solution, and stir for 30 minutes. Weigh 14.61 g of 85% phosphoric acid, add to the above solution, and stir for 2 h. After the crystallization stock solution was aged for 2 hours, it was poured into a hydrothermal crystallization kettle, and hydrothermally crystallized at 200° C. for 96 hours. After chilling, filter, wash, dry, and activate by roasting at 600°C for 4h. XRD characterization results showed that the obtained product was SAPO-34 molecular sieve.

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Abstract

The invention relates to a method for preparing an SAPO-34 molecular sieve molded catalyst, a molded catalyst prepared by the method and application of the molded catalyst. The method comprises the following steps of: activating montmorillonoid by using aqueous alkali; mixing the activated montmorillonoid and an aluminum source, a phosphorus source, a template agent and de-ionized water and then performing a hydrothermal crystallization reaction at a high temperature; and mixing and molding a montmorillonoid-contained base material, crystallization liquid of a silicoaluminophosphate molecular sieve and a binder to obtain the SAPO-34 molecular sieve molded catalyst. In the invention, the SAPO-34 molecular sieve molded catalyst is prepared by taking the montmorillonoid as a raw material, and the non-converted montmorillonoid in the crystallization liquid is used as a carrier material when the catalyst is molded, so that a carrier can be avoided or a smaller amount of the carrier is used during molding; and due to a layer structure of the montmorillonoid, a mesoporous or macropore structure can be formed when the catalyst is molded, and a pore-forming agent is not required to be added into the molding liquid, so that resources are saved and cost is reduced.

Description

technical field [0001] The invention relates to a silicoaluminophosphate (SAPO) molecular sieve, and more particularly relates to a method for preparing a SAPO-34 molecular sieve shaped catalyst. Background technique [0002] The US Patent USP4440871 in 1984 disclosed that a certain proportion of silicon source, aluminum source, phosphorus source and template were mixed, and hydrothermal crystallization at 100-250 ° C was used to synthesize a variety of new silicoaluminophosphate series (SAPO-n) molecular sieves , of which SAPO-34 has good catalytic performance for the reaction of methanol or dimethyl ether to olefins. Due to its special properties, many scholars have become very interested in its synthesis technology and catalytic application. [0003] Since the grain size has a great influence on the product selectivity of the MTO reaction, many scholars have devoted themselves to the development of small particle size molecular sieve catalysts. EP-A-541915 describes in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J37/00C07C1/20C07C11/04C07C11/06C07C4/06C07C6/04
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 邢爱华蒋立翔李艺朱伟平岳国
Owner CHNA ENERGY INVESTMENT CORP LTD
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