Preparation method of low-cost strong-acid hierarchical-pore Beta zeolite

A beta zeolite and multi-level pore technology, which is applied in the field of preparation of multi-level pore Beta zeolite, can solve the problems of molecular sieve acid weakening, etc., and achieve the effects of improving reactivity, reducing cost, large reaction space and anti-deactivation ability

Inactive Publication Date: 2015-02-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention aims to solve the acid weakening problem of the existing desiliconization post-treatment hierarchica

Method used

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  • Preparation method of low-cost strong-acid hierarchical-pore Beta zeolite
  • Preparation method of low-cost strong-acid hierarchical-pore Beta zeolite
  • Preparation method of low-cost strong-acid hierarchical-pore Beta zeolite

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specific Embodiment approach 1

[0016] Specific embodiment one: the preparation method of the cheap strongly acidic hierarchical porous Beta zeolite of the present embodiment is carried out according to the following steps:

[0017] 1. Calcining Beta zeolite at 500-600°C for 3-10 hours to obtain microporous hydrogen Beta zeolite;

[0018] 2. Add the microporous hydrogen Beta zeolite into the alkali solution with a concentration of 0.1-2mol / L, stir at 0-100°C for 0.5-2h, and then wash the microporous hydrogen Beta zeolite with deionized water until the filtrate becomes medium properties, and then dried at 100-120°C to obtain sodium-type desiliconized hierarchically porous Beta zeolite;

[0019] 3. Add the sodium-type desiliconized hierarchically porous Beta zeolite obtained in step 2 into an aqueous ammonium nitrate solution with a concentration of 1-2 mol / L and exchange for 1-5 times, each time for 0.5-2 hours, and calcinate at 500-600°C Obtain hydrogen type desilication hierarchical porous Beta zeolite aft...

specific Embodiment approach 2

[0021] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the alkaline solution in step 2 is NaOH aqueous solution. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the solid-to-liquid ratio of the microporous hydrogen Beta zeolite to the alkali solution in step 2 is 1 g:10-50 mL. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of low-cost strong-acid hierarchical-pore Beta zeolite, and relates to a preparation method of hierarchical-pore Beta zeolite. The problem that the acidity of an existing desilicication post-treatment hierarchical-pore Beta zeolite molecular sieve is weakened is solved. The preparation method comprises the steps of 1. calcining Beta zeolite to obtain microporous hydrogen type Beta zeolite; 2. adding the microporous hydrogen type Beta zeolite into an alkaline solution, stirring, and washing and drying to obtain sodium type desilicication hierarchical-pore Beta zeolite; 3. adding the sodium type desilicication hierarchical-pore Beta zeolite into an ammonium nitrate aqueous solution for exchange, and calcining to obtain hydrogen type desilicication hierarchical-pore Beta zeolite; and 4. adding the hydrogen type desilicication hierarchical-pore Beta zeolite into an acidic solution, stirring, washing and drying, and repeating the step 3 to obtain the strong-acid hierarchical-pore Beta zeolite.

Description

technical field [0001] The invention relates to a preparation method of multi-level porous Beta zeolite. Background technique [0002] Zeolite material has high acidity and high specific surface area, and is an excellent acidic catalyst. At the same time, zeolite materials have strong chemical stability and hydrothermal stability, and are difficult to be destroyed by corrosion and dissolution of reactants. Compared with commonly used homogeneous catalysts, zeolite material catalysts can be directly reused without separation, and will not pollute the environment and products. [0003] At present, zeolite catalysts are widely used in acidic catalytic reactions, such as cracking reactions and Friedel-Crafts alkylation reactions. Among them, the pore structure of Beta zeolite is relatively large and has a three-dimensional pore structure, so the reaction performance is very excellent. Especially for Friedel-Crafts alkylation, Beta zeolite is superior to other types of zeolite...

Claims

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Application Information

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IPC IPC(8): B01J29/06B01J35/10
Inventor 孙印勇王一
Owner HARBIN INST OF TECH
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