Molecular sieve composite material having core-shell structure, preparation method and application thereof

A composite material and molecular sieve technology, which is applied in the preparation of inorganic composite materials, has the field of preparation of alumina and molecular sieve composite materials, and achieves the effects of easy modulation and chemical modification, and simple and easy preparation procedures.

Inactive Publication Date: 2016-10-05
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Molecular sieve composite material having core-shell structure, preparation method and application thereof
  • Molecular sieve composite material having core-shell structure, preparation method and application thereof
  • Molecular sieve composite material having core-shell structure, preparation method and application thereof

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preparation example Construction

[0048] A preparation method of a molecular sieve composite material with a core-shell structure, the preparation method comprising:

[0049] Step 1: mixing the microporous molecular sieve and deionized water, adjusting the pH to 3-8 with acid, preparing a microporous molecular sieve slurry after beating, and controlling the solid content of the prepared microporous molecular sieve slurry to 10-60wt%;

[0050] Step 2: Mix and beat the mesoporous alumina molecular sieve with water, adjust the pH value of the system to 1.5-5 with acid, and prepare the mesoporous alumina molecular sieve peptizing slurry, and control the liquid-solid content of the prepared mesoporous alumina mucilage at 3~35wt%;

[0051] Step 3: Mix the microporous molecular sieve slurry and the mesoporous alumina glue slurry, the mass of the mesoporous alumina molecular sieve accounts for 5-50wt% of the mass of the microporous molecular sieve, stir the mixed solution at 25-50°C for 10-60min, adjust with acid The...

Embodiment 1

[0054] Embodiment 1: the synthesis of mesoporous alumina molecular sieve

[0055] Firstly, 2.0g of template agent P123 was dissolved in 40ml of ethanol, and stirred continuously at room temperature for 2h. Add 5.6ml of concentrated nitric acid and 2.04g of aluminum isopropoxide (10mmol), and stir the reaction at room temperature for 5h. The obtained solution was aged in an oven at 60° C. for 48 h. The obtained bright yellow solid was calcined in a muffle furnace at 700° C. for 4 h to obtain a white solid powder sample. see figure 1 , it can be seen from the figure that the prepared sample has a sharp diffraction peak around 0.9°, which is the characteristic diffraction peak of the ordered mesoporous alumina molecular sieve, indicating that the sample has a long-range ordered one-dimensional hexagonal mesoporous channel structure, which is consistent with The results reported in the literature are consistent.

Embodiment 2

[0056] Example 2: Preparation of ZSM-5 molecular sieve composite material coated with mesoporous alumina molecular sieve

[0057] (1) step: mix the ZSM-5 molecular sieve with a solid content of 30wt% and an appropriate amount of deionized water, adjust the pH to about 5 with hydrochloric acid, and prepare a ZSM-5 molecular sieve slurry after beating.

[0058] (2) step: mix the mesoporous alumina molecular sieve synthesized in Example 1 with a solid content of 15wt% and metered deionized water, adjust the pH of the system with hydrochloric acid to be about 3, and prepare mesoporous alumina molecular sieve peptization after beating slurry.

[0059] (3) Step: Take by weighing an appropriate amount of mesoporous alumina molecular sieve glue solution and ZSM-5 molecular sieve slurry according to the mass percentage of alumina / ZSM-5 as 30wt%, mix the two and adjust the pH value of the system to about 4 with hydrochloric acid, and then Stirring at 40°C for 30 minutes, then standing ...

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Abstract

A molecular sieve composite material having a core-shell structure, a preparation method and an application thereof. The preparation method includes the steps of: (A) preparing micro-pore molecular sieve slurry; (B) mixing and pulping meso-pore aluminum oxide molecular sieve with water, and regulating the pH value of the mixture with an acid to 1.5-5 to prepare meso-pore aluminum oxide molecular sieve peptized slurry; and (C) mixing the micro-pore molecular sieve slurry with the meso-pore aluminum oxide molecular sieve peptized slurry and allowing the slurry to stand to age the slurry for 10-60 min, and filtering, washing and drying the slurry and roasting the slurry at 150-800 DEG C for 0.5-2 h to obtain a finis product. Compared with a conventional in-situ coating method, the preparation method avoids complex in-situ coating and subsequent crystallizing operations and has simple processes. The meso-pore aluminum oxide molecular sieve coating material is synthesized before, so that regulation and chemical modification on the coating material are easy to carried out compared with the in-situ coating method and the like.

Description

technical field [0001] The invention relates to a preparation method of an inorganic composite material, the prepared composite material and its application, in particular to a preparation method of an alumina and molecular sieve composite material, the prepared composite material and its application. Background technique [0002] As a solid acid catalyst, molecular sieves are widely used in the chemical industry. With the development of the times, people have higher and higher requirements for the performance of molecular sieves. For this reason, bicomponent molecular sieve composite materials or molecular sieve composite materials with hierarchical pore structure have been synthesized successively. This type of material mainly combines molecular sieves with different pore structures, pore size distributions and surface acidity through coating, intergrowth and eutectic methods. The molecular sieve particles with two different structures are combined with each other in a co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80B01J29/40C10G11/05
Inventor 袁程远高雄厚潘志爽李雪礼黄校亮蔡进军谭争国段宏昌刘超伟张海涛
Owner PETROCHINA CO LTD
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