Combined modification method for mesopore USY molecular sieve

A molecular sieve and mesopore-rich technology, applied in the field of USY molecular sieve modification, can solve the problems of harsh modification conditions, expensive chemicals, unfavorable industrialization, etc.

Inactive Publication Date: 2014-07-23
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the modification conditions of these methods are relatively harsh, and som...

Method used

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  • Combined modification method for mesopore USY molecular sieve
  • Combined modification method for mesopore USY molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Weigh 12g of USY and pour it into a 250ml three-necked plastic flask; measure citric acid solution and ammonium fluoride solution according to the ratio; 40ml of 0.4mol / L citric acid solution and 80ml of 0.2mol / L ammonium fluoride solution. Stir at room temperature, set the water bath temperature of 90°C to react; after constant temperature reaction for 8 hours, wash and filter the product until the surface of the product is neutral; put it in an oven at 110°C, dry at constant temperature for 16 hours, and grind to obtain a modified sample.

Embodiment 2

[0020] Weigh 48g of USY and pour it into a 1L autoclave; according to the ratio, measure 160ml of citric acid solution with a concentration of 0.4mol / L and 320ml of an ammonium fluoride solution with a concentration of 0.2mol / L; stir, fill the kettle, and set the temperature of the inner kettle 90°C; after the temperature of the inner kettle reaches the set temperature, react at a constant temperature for 8 hours, wash and filter until the surface of the product is neutral; put it in an oven at 110°C, dry at a constant temperature for 16 hours, and grind to obtain a modified sample in a large kettle .

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Abstract

The invention relates to a modification method for a USY molecular sieve and in particular relates to a combined modification method for a mesopore USY molecular sieve. The combined modification method for the mesopore USY molecular sieve comprises that raw materials such as a USY material, an organic acid solution and an inorganic salt solution are measured in ratio, stirring in a closed reactor is carried out, temperature is increased to 90 DEG C, an organic acid-inorganic salt combined dealumination reaction is carried out for 8 hours; reactants are washed at room temperature, and suction filtration is carried out until the surface of USY is neutral; and drying is carried out at constant temperature of 110 DEG C for 16 hours, so that the USY molecular sieve product is obtained. The combined modification method for the mesopore USY molecular sieve has the advantages that a mixed aqueous solution of organic acid and inorganic salt is adopted for treating the USY type molecular sieve, so that high crystallinity of the molecular sieve can be maintained, silica-alumina ratio of the molecular sieve is increased, lattice constant is reduced, specific surface of the molecular sieve is increased, and acidity and acid distribution of the molecular sieve are improved; and more secondary holes are formed through dealumination, so that components with larger molecular diameter can easily enter into pore passages of the molecular sieve or get close to the surface of the molecular sieve, and conversion efficiency of hydrogen cracking can be improved.

Description

technical field [0001] The invention relates to a method for modifying USY molecular sieves, in particular to a combined modification method for mesoporous-rich USY molecular sieves. technical background [0002] Modified USY requires a certain amount of secondary pores. After increasing the concentration of the modifier, the molecular sieve will be dealuminated in a large amount, which will create a large number of secondary pores, but the crystallinity will drop sharply, and the thermal and hydrothermal stability will deteriorate. . At present, the commonly used methods of USY modification are: [0003] Hydrothermal dealumination treatment, the USY obtained by this treatment contains more non-skeleton aluminum, low crystallinity, and poor content of secondary pores, which cannot meet the performance requirements of the catalyst carrier for high and medium oil type hydrocracking. [0004] Chemical treatment methods include SiCl4 high temperature gas phase method, (NH 4 )...

Claims

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Application Information

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IPC IPC(8): C01B39/24B01J29/08
Inventor 阎子峰刘欣梅乔柯戴磊昌兴文张志华戴宝琴高雄厚张忠东
Owner PETROCHINA CO LTD
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