Preparation method for highly acid Y type molecular sieve

A technology of molecular sieve and acid solution, which is applied in the direction of crystalline aluminosilicate zeolite and octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of micropore channel damage and molecular sieve lattice collapse, etc., so as to avoid the destruction of micropore channels, Low cost, less diffusion limiting effect

Active Publication Date: 2017-06-16
PETROCHINA CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Removal of molecular sieve skeleton atoms can effectively form mesopores, but it wi

Method used

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  • Preparation method for highly acid Y type molecular sieve
  • Preparation method for highly acid Y type molecular sieve
  • Preparation method for highly acid Y type molecular sieve

Examples

Experimental program
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Example Embodiment

[0048] Example 1:

[0049] The present embodiment provides a kind of preparation method of Y-type molecular sieve, and it comprises the following steps:

[0050] (1) Weigh 30.3g of water glass, 7.09g of sodium hydroxide, 2.25g of sodium metaaluminate and mix with 44mL of deionized water, stir rapidly for 1 hour, and then stand in a water bath at 30°C for 3 hours to obtain a Y-type molecular sieve directing agent.

[0051] (2) Weigh water glass, 13g Y-type molecular sieve directing agent and deionized water and mix evenly, stir for 2 hours; dissolve low partial solution (sodium hydroxide and sodium aluminate in deionized water) and aluminum sulfate solution (aluminum sulfate octadecahydrate dissolved in deionized water) into the reaction system to obtain aluminosilicate gel (SiO 2 :Al 2 o 3 : Na 2 O: H 2 O=10:1.2:10:150), stir until the system is uniform, then crystallize at 90°C for 18h; the obtained product is cooled, washed, suction filtered (to neutral), and dried at 6...

Example Embodiment

[0053] Example 2:

[0054] The present embodiment provides a kind of preparation method of Y-type molecular sieve, and it comprises the following steps:

[0055] (1) Weigh 30.3g of water glass, 7.09g of sodium hydroxide, 2.25g of sodium metaaluminate and mix with 44mL of deionized water, stir rapidly for 1 hour, then let stand in a water bath at 40°C for 4 hours to obtain a Y-type molecular sieve directing agent.

[0056] (2) Weigh water glass, 10g Y-type molecular sieve guide agent and deionized water and mix evenly, stir for 2 hours; dissolve low partial solution (sodium hydroxide and sodium aluminate in deionized water) and aluminum sulfate solution (aluminum sulfate octadecahydrate dissolved in deionized water) into the reaction system to obtain aluminosilicate gel (SiO 2 :Al 2 o 3 : Na 2 O: H 2 O=10:1.2:15.3:160), stir until the system is uniform, then crystallize at 90°C for 24h; the obtained product is cooled, washed, suction filtered (to neutral), and dried at 60°...

Example Embodiment

[0058] Example 3:

[0059] The present embodiment provides a kind of preparation method of Y-type molecular sieve, and it comprises the following steps:

[0060] (1) Weigh 20 g of water glass, 8.09 g of sodium hydroxide, 2.25 g of sodium metaaluminate and 44 mL of deionized water, stir rapidly for 1 h, and then stand in a 45°C water bath for 5 h to obtain a Y-type molecular sieve directing agent.

[0061] (2) Weigh water glass, 10g Y-type molecular sieve guide agent and deionized water and mix evenly, stir for 2 hours; dissolve low partial solution (sodium hydroxide and sodium aluminate in deionized water) and aluminum sulfate solution (aluminum sulfate octadecahydrate dissolved in deionized water) into the reaction system to obtain aluminosilicate gel (SiO 2 :Al 2 o 3 : Na 2 O: H 2 O=12:1.4:17.1:190), stir until the system is uniform, and crystallize at 100°C for 24h; the obtained product is cooled, washed, suction filtered (to neutral), and dried at 60°C to obtain NaY ...

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Abstract

The invention provides a preparation method for a highly acid Y type molecular sieve. The method comprises the following steps a, mixing a silicon source, an aluminum source, an alkali source and water and then carrying out ageing at a predetermined temperature so as to obtain a Y type molecular sieve guiding agent; b, mixing the Y type molecular sieve guiding agent, the silicon source and water at room temperature under stirring, then adding the aluminum source and the alkali source under stirring, carrying out crystallization at 90 to 110 DEG C for 12 to 48 h, and successively carrying out cooling, washing, pumping filtration and drying at 30 to 80 DEG C so as to obtain a NaY type molecular sieve; and c, treating the NaY type molecular sieve in an aqueous solution of an ammonium salt, then treating the NaY type molecular sieve in an acid solution, carrying out treatment in a solution containing cetyl trimethyl ammonium bromide, ammonia water and LaCl3 and then roasting the NaY type molecular sieve at 400 to 600 DEG C for 1 to 10 h so as to obtain the Y type molecular sieve. The preparation method provided by the invention is simple in process and low in cost, and prevents collapse of the crystal lattice of the molecular sieve and destroy of microporous channels while preparing the highly acid Y type molecular sieve with a high degree of crystallization.

Description

technical field [0001] The invention relates to a method for preparing strongly acidic Y-type molecular sieves, belonging to the field of catalyst preparation. Background technique [0002] Y-type molecular sieves have attracted widespread attention as the main active component of catalytic cracking catalysts. However, during heavy oil processing, the diffusion limitation brought about by its pore size of 0.74nm prevents heavy oil macromolecules from cracking effectively. Introducing mesoporous (2-50nm) into Y-type molecular sieve can reduce diffusion limitation, make heavy oil macromolecules easy to approach the active center of catalyst and effectively crack, and get more target products. Scholars at home and abroad have studied a variety of methods for synthesizing mesoporous molecular sieves, including the "bottom-up" direct synthesis method and the "top-down" post-processing method. [0003] CN102874836A discloses a method of synthesizing a mesoporous A-type molecular...

Claims

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Application Information

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IPC IPC(8): C01B39/24
CPCC01B39/24C01P2002/01C01P2002/72C01P2004/03C01P2006/14C01P2006/17
Inventor 刘洪涛刘宏海赵晓争高雄厚王久江胡清勋刘超伟金君素徐春艳孟庆亭王宝杰张莉赵红娟熊晓云
Owner PETROCHINA CO LTD
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