Method for synthesizing superfine Y-type molecular sieve

A molecular sieve and fine powder technology, which is applied in the directions of eight-sided crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., to achieve the effect of easy operation

Inactive Publication Date: 2010-11-24
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A single fine powder can no longer meet the requirements of the catalytic reaction in terms of catalyst activity, but it is suitable as a raw material for the synthesis of high value-added silicon-alumina materials in terms o

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] (1) After mixing 102 grams of FCC waste catalyst fine powder with 120 grams of NaOH, roasting at 900 ° C for 3 hours;

[0012] (2) Sodium hydroxide, sodium metaaluminate, silica sol and distilled water were mixed according to Na 2 O:Al 2 o 3 : SiO 2 : H20 =16:1:16:280 (molar ratio) ratio mixing, strong stirring for 1 hour, standing and aging for 12 hours to obtain the directing agent;

[0013] (3) The directing agent obtained in the fine powder after activation in (1), distilled water, sodium hydroxide, silica sol and (2) is mixed uniformly, and the molar composition obtained is Na 2 O:Al 2 o 3 : SiO 2 :H 2 O = 4.8: 1: 8: 120 mixed; then the resulting mixture was crystallized at 85°C for 16 hours, after the reaction was completed, suction filtered, washed and dried to obtain a solid product.

[0014] It is known through testing that the synthesized product is NaY molecular sieve with a crystallinity of 56.2%. The specific surface reaches 605.3m 2 g -1 , the ...

Embodiment 2

[0016] The experimental process of this embodiment is the same as that of Example 1, except that the ratio of raw materials is changed so that Na 2 O:Al 2 o 3 : SiO 2 :H 2 O=4.8:1:10:120, other conditions remain unchanged.

[0017] It is known through testing that the synthesized product is NaY molecular sieve with a crystallinity of 58.8%. The specific surface reaches 598.2m 2 g -1 , the total pore volume is 0.293cm 3 g -1 . The product has a lamellar structure and the particle size is concentrated at 300-400nm.

Embodiment 3

[0019] The experimental process of this embodiment is the same as that of Embodiment 1, except that the crystallization time is changed to 20 h, and other conditions remain unchanged.

[0020] It is known through testing that the synthesized product is NaY molecular sieve with a crystallinity of 51.6%. The specific surface reaches 631.3m 2 g -1 , the total pore volume is 0.325cm 3 g -1 . The product has a lamellar structure and the particle size is concentrated at 200nm.

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Abstract

The invention discloses a method for synthesizing a superfine Y-type molecular sieve by using FCC spent catalyst fine powder, and belongs to the field of solid waste recycling. The method comprises the following steps of dissolving an FCC spent catalyst by using alkali for activation, and preparing the superfine Y-type molecular sieve by utilizing structure-oriented hydrothermal synthesis technology under the condition of adding a silicon source. The particle size of the obtained molecular sieve is controlled by a synthetic condition, particularly the activation condition of raw materials, and the particle size of the product can reach about 200 nm. Besides, the obtained product has a larger specific surface and a stable structure, and has a lamellar structure. In the method, the greening production process of the FCC is optimized, and the high-efficiency recycling of waste resources is realized, so that the method has good industrialized application prospect.

Description

technical field [0001] The invention relates to a method for preparing superfine Y-type molecular sieves from FCC waste catalyst fine powder, which belongs to the field of solid waste treatment and application. The method uses catalytic cracking waste catalyst fine powder as a raw material, and the raw material mainly comes from catalytic cracking third-stage and fourth-stage cyclone separators and flue gas, and roasting it with alkali to activate it, and adding a silicon source, It is synthesized by structure-oriented hydrothermal crystallization technology. Background technique [0002] Catalytic cracking (FCC) is a secondary processing process with the largest amount of catalyst in the oil refining industry. However, during the use of the catalyst, due to the deposition of heavy metals, the existence of a large amount of atomized steam at high temperature, and the linear velocity of the raw material nozzle or the steam linear velocity at the bottom of the pre-riser tube ...

Claims

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Application Information

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IPC IPC(8): C01B39/24
Inventor 刘欣梅梁海宁李亮杨婷婷阎子峰
Owner PETROCHINA CO LTD
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