Method for synthesizing Y/beta composite molecular sieve

A composite molecular sieve and molecular sieve technology, applied in the direction of octahedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of using organic templates, increasing operation steps, and health hazards to achieve crystallinity improvement, The effect of improving guiding efficiency and reducing dosage

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The above patents disclose different preparation methods about Y and β composite molecular sieves, but they all have a common defect, that is, organic templates are used in the preparation process.
As we all know, the proportion of organic template agent in the preparation cost of zeolite molecular sieve is the highest, and the use of template agent also increases the operation steps of removing organic matter from composite molecular sieve, which not only increases the cost, but also pollutes the environment
And operators will cause great harm to their health when they come into contact with organic templates. For these reasons, many zeolite molecular sieve materials with excellent performance cannot be applied on a large scale in industry, so the development of economical and environmentally friendly zeolite molecular sieve synthesis technology is a new type. The basis for the wide application of catalytic materials

Method used

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  • Method for synthesizing Y/beta composite molecular sieve
  • Method for synthesizing Y/beta composite molecular sieve
  • Method for synthesizing Y/beta composite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take 40g of β molecular sieve and 1000mL of 1mol / L NaOH solution in a beaker, stir at room temperature for 30min, transfer to a closed reaction kettle, and treat in an oven at 120°C for 4h. The resulting suspension is the structure-directing agent and is ready for use.

[0041] Initial silica-alumina gel molar ratio: 12.4Na 2 O:50.7SiO 2 :A1 2 o 3 :1200H 2 O. Take 22 g of sodium hydroxide and 5.5 g of sodium aluminate in 500 mL of distilled water, and stir vigorously until they are completely dissolved. Add 70 g of white carbon black slowly and stir vigorously for 30 min. Then add 20mL of the structure-directing agent prepared in the previous step, and stir vigorously for 30 min. Then add 30 g of Y-type molecular sieves, stir vigorously for 30 minutes, put it into a closed reaction kettle, and crystallize in an oven at 130°C for 50 hours. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120°C for 4 hours, and the obtained ...

Embodiment 2

[0045] Take 35g of β molecular sieve and 800mL of 0.8 mol / L KOH solution in a beaker, stir at room temperature for 30min, transfer to a closed reaction kettle, and treat in an oven at 120°C for 3h. The resulting suspension is the structure-directing agent and is ready for use.

[0046] Initial molar ratio of silica-alumina gel: 16.9Na 2 O:60SiO 2 :A1 2 o 3 :960H 2 O. Take 31 g of sodium hydroxide and 18 g of aluminum sulfate in 200 mL of distilled water, and stir vigorously until they are completely dissolved. Add 100 mL of water glass (8 mol / L) slowly, and stir vigorously for 30 min. Then add 30mL of the structure-directing agent prepared in the previous step, and stir vigorously for 40 min. Then add 20 g of Y-type molecular sieves, stir vigorously for 30 minutes, put it into a closed reaction kettle, and crystallize in an oven at 140°C for 35 hours. The obtained product was washed 4 times with distilled water until neutral, and dried at 120°C for 4 hours to obtain a ...

Embodiment 3

[0049] Take 40g of β molecular sieve and 1000mL of 1.2 mol / L NaOH solution in a beaker, stir at room temperature for 30min, transfer to a closed reaction kettle, and treat in an oven at 120°C for 4h. The resulting suspension is the structure-directing agent and is ready for use.

[0050] Initial silica-alumina gel molar ratio: 9.8Na 2 O:40SiO 2 :A1 2 o 3 :1200H 2 O. Take 20 g of sodium hydroxide and 4.2 g of sodium aluminate in 400 mL of distilled water, and stir vigorously until they are completely dissolved. Add 200 g of silica sol (30%) slowly and stir vigorously for 30 min. Then add 40mL of the structure-directing agent prepared in the previous step, and stir vigorously for 30 min. Then add 40 g of Y-type molecular sieves, stir vigorously for 30 minutes, put it into a closed reaction kettle, and crystallize in an oven at 125°C for 55 hours. The obtained product was washed 4 times with distilled water until neutral, and dried at 120°C for 4 hours to obtain a Y / β com...

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Abstract

The invention discloses a method for synthesizing a Y/beta composite molecular sieve, comprising the following steps of: firstly carrying out alkali treatment on beta zeolite to prepare a structure-directing agent; stirring inorganic base, an aluminium source, a silicon source and water according to the mole ratio of 8-17Na2O: 30-100SiO2:Al2O3: 800-2100H2O so as to synthesize an initial silica-alumina gel, adding the structure-directing agent and a Y molecular sieve, and crystallizing at the temperature of 100-170 DEG C for 20-80 hours so as to obtain the product. By the adoption of the method, the structure-directing agent greatly raises directing efficiency of beta zeolite crystal seeds, sharply reduce the amount of beta zeolite and simultaneously significantly improve crystallization degree of the beta molecular sieve in the synthesized composite molecular sieve. The method provided by the invention is simple and easy to operate. Raw materials are cheap, easily available and nontoxic and harmless such that the use of expensive and toxic organic template raw materials is avoided. Therefore, production cost is significantly reduced, and the whole preparation process is green and environmental friendly.

Description

[0001] technical field [0002] The invention relates to a method for synthesizing Y / β composite molecular sieves, in particular to a green method for synthesizing Y / β composite molecular sieves, belonging to the field of synthesis of molecular sieve catalytic materials. [0003] technical background [0004] Y-type molecular sieve is the most important catalytic material in the petrochemical industry. Its invention and application caused a revolution in the petrochemical field in the 1960s. β molecular sieve is currently the only large-pore high-silicon molecular sieve with a crossed twelve-membered ring channel system. Its excellent catalytic performance has always attracted people's attention. widely used in reactions. [0005] At present, Y-type molecular sieve is used as the main catalyst component of traditional catalytic cracking and hydrocracking, and its performance expansion space has been narrowed. In order to further improve the performance of the catalyst, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04C01B39/24
Inventor 范峰凌凤香王少军杨春雁
Owner CHINA PETROLEUM & CHEM CORP
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