Y molecular sieve modification method

A molecular sieve and modification technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, catalyst carriers, etc., can solve the problems of less secondary pores and lower crystallinity of Y molecular sieves, so as to improve the silicon-aluminum ratio, reduce the unit cell constant, good practical effect

Active Publication Date: 2009-12-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the modification method of the above-mentioned Y molecular sieve is that the crystallinity of the Y molecular sieve after modification is reduced more, and the secondary pores are also few.

Method used

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  • Y molecular sieve modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare it with the ratio of 5g of NaY molecular sieve: 6.5g of ammonium sulfate: 50mL of water, and put it into a three-necked flask. The ion exchange temperature is 95°C for 1h, then, filter, wash, and then use a solution of 6.5g ammonium sulfate: 50mL of water for secondary ion exchange, finally filter, wash the wet filter cake, and roast at 600°C for 2h.

[0032] Grind the Y molecular sieve after exchange and hydrothermal treatment into powder, take 5.0g in a three-necked flask; weigh 6.5g of ammonium sulfate and add 50mL of water to prepare a solution, and then add 1.0g of surfactant hexadecyl Trimethylammonium bromide (CTAB), stir evenly; add it into the flask, heat it in a water bath to 100°C, then add 35L of 10% oxalic acid and ammonium oxalate solution, stir for 4 hours, put it in an autoclave, and set it at a certain temperature Under 120 ℃ hydrothermal crystallization for 12h. Filter, dry, and bake at 500°C for 6h. The modified Y molecular sieve 1 was obtai...

Embodiment 2

[0034] Prepare it with the ratio of 5g of NaY molecular sieve: 6.5g of ammonium sulfate: 50mL of water, and put it into a three-necked flask. The ion exchange temperature is 95°C for 1h, then, filter, wash, and then use a solution of 6.5g ammonium sulfate: 50mL of water for secondary ion exchange, finally filter, wash the wet filter cake, and roast at 600°C for 2h.

[0035] Grind the Y molecular sieve after exchange and hydrothermal treatment into powder, take 5.0g in a three-necked flask; weigh 6.5g of ammonium sulfate and add 50mL of water to prepare a solution, then add 1.0g of surfactant CTAB and stir evenly Add it into a flask, heat it in a water bath to 100°C, then add 45mL of 10% oxalic acid and ammonium oxalate solution, stir for 4 hours, put it in an autoclave, and conduct hydrothermal crystallization at a certain temperature of 120°C for 12h. Filter, dry, and bake at 500°C for 6h. The modified Y molecular sieve 2 was obtained.

Embodiment 3

[0037] Prepare it with the ratio of 5g of NaY molecular sieve: 6.5g of ammonium sulfate: 50mL of water, and put it into a three-necked flask. The ion exchange temperature is 95°C for 1h, then, filter, wash, and then use a solution of 6.5g ammonium sulfate: 50mL of water for secondary ion exchange, finally filter, wash the wet filter cake, and roast at 600°C for 2h.

[0038] Grind the Y molecular sieve after exchange and hydrothermal treatment into powder, take 5.0g in a three-necked flask; weigh 6.5g of ammonium sulfate and add 50mL of water to prepare a solution, then add 1.0g of surfactant CTAB and stir evenly Add it into a flask, heat it in a water bath to 100°C, then add 55mL of 10% oxalic acid and ammonium oxalate solution, stir for 4h, put it in an autoclave, and conduct hydrothermal crystallization at a certain temperature of 120°C for 12h. Filter, dry, and bake at 500°C for 6h. The modified Y molecular sieve 3 was obtained.

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Abstract

The invention relates to a modification method of Y molecular sieve. The method is characterized in that surfactants are added in the acid dealumination process, that is, industrial NaY molecular sieves are used as raw materials through ammonium exchange, and after deep roasting, acid dealumination is carried out under the protection of surfactants, and a higher SiO2 / Al2O3 ( 9-15) HY molecular sieves while maintaining high crystallinity. Compared with industrial NaY molecular sieves, the secondary pores of the molecular sieve prepared by this method are greatly improved, and the acid structure is also further improved. Support for hydrotreating catalysts for heavy distillate oils.

Description

technical field [0001] The invention relates to a modification method of Y molecular sieve. Specifically, the combination of oxalic acid dealumination and surfactant is used to dealuminate NaY molecular sieves and form more secondary pores. Background technique [0002] Due to the different methods of preparing Y molecular sieves, the resulting products are also called differently. One is called ultra-stable Y (USY), which is a product obtained by a single hydrothermal method. As introduced in patents USP3293192, USP3781199, USP4036739, etc., sodium-type molecular sieves are ion-exchanged and then calcined at high temperature in the presence of water vapor, and it is possible to repeat the above steps many times to obtain low-sodium oxides with a higher skeleton silicon-aluminum ratio. Ultrastable Y molecular sieve. The samples obtained by this method contain a large amount of non-framework aluminum. The other is called dealuminated Y molecular sieve (DAY), which is prepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24B01J32/00B01J29/08
Inventor 刘百军冯智高山松
Owner BC P INC CHINA NAT PETROLEUM CORP
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