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Mesoporous beta zeolite and preparation method thereof

A beta zeolite and mesoporous technology, applied in the field of mesoporous beta zeolite and its preparation, can solve the problems of high preparation cost and improved molecular diffusivity of mesoporous zeolite, and achieve the advantages of reduced preparation cost, large volume, and simple and economical preparation process. Effect

Active Publication Date: 2017-08-11
WUHAN KAIDI ENG TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aforementioned mesoporous zeolites all have the problems of high preparation cost and the molecular diffusivity of the obtained mesoporous zeolites to be improved

Method used

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  • Mesoporous beta zeolite and preparation method thereof
  • Mesoporous beta zeolite and preparation method thereof
  • Mesoporous beta zeolite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Take by weighing 8.4g tetraethylammonium bromide (technical grade 98wt%), 0.8g sodium hydroxide 96wt%, 0.43g pseudo-boehmite (70wt%, technical grade), 0.3g squid powder, 20g water, 1g Dehydrated alcohol (99.5%) was mixed and stirred to a clear solution, then 7.2g of white carbon black (technical grade 98wt%) was added to the solution under constant stirring, and continued stirring to obtain a uniform silica-alumina gel; The gel was dynamically crystallized at 140°C for 10 days, and after solid-liquid separation, washing and drying, it was calcined at 550°C for 8 hours in an air stream to obtain a mesoporous Beta zeolite molecular sieve.

Embodiment 2

[0035] Take by weighing 8.4g tetraethylammonium bromide (technical grade 98wt%), 0.53g sodium hydroxide 96wt%, 0.43g pseudo-boehmite (70wt%, technical grade), 0.2g squid powder, 30g orthosilicic acid Ethyl ester (technical grade SiO 2 , 28wt%), 1g of absolute ethanol (99.5%), mixed and stirred to obtain a uniform silica-alumina gel, and the silica-alumina gel was dynamically crystallized at 140 ° C for 10 days, after solid-liquid separation and washing and drying, in the air flow Calcined at 550°C for 8 hours to obtain Beta zeolite molecular sieve.

[0036]The specific mesoporous structural characteristics of the mesoporous Beta zeolite obtained in Example 2 are shown in Table 1 below.

Embodiment 3

[0038] Take by weighing 9.4g tetraethylammonium bromide (technical grade 98wt%), 0.53g sodium hydroxide 96wt%, 0.75g sodium metaaluminate (41wt%, technical grade), 0.4g squash powder, 30g ethyl orthosilicate Esters (industrial grade SiO 2 , 28wt%), 1g absolute ethanol (99.5%), mixed and stirred to obtain a uniform silica-alumina gel, and continued stirring to obtain a uniform silica-alumina gel; the silica-alumina gel was dynamically crystallized at 145 ° C for 7 days, After solid-liquid separation, washing and drying, it is calcined at 550° C. for 8 hours in an air stream to obtain a Beta zeolite molecular sieve.

[0039] The specific mesoporous structural characteristics of the mesoporous Beta zeolite obtained in Example 3 are shown in Table 1 below.

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PUM

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Abstract

The invention discloses mesoporous beta zeolite and a preparation method thereof. The mesoporous beta zeolite contains micropores and intracrystalline mesopores, wherein the intracrystalline mesopores have a pore diameter of 2.5 to 9 nm, a pore volume of 0.2 to 0.3 cm<3> / g and a specific surface area of 142 to 284 m<2> / g. The mesoporous beta zeolite has a large specific surface area and a large mesoporous volume, and the pore diameter of the mesoporous beta zeolite enables the pore channels of a carrier to guarantee the diffusion rate of reactant molecules and high-frequency collision with the reactant molecules, so diffusion and collision are balanced, and the carrier has improved accessibility to macro-molecule reactants and guest molecule diffusion capability. The preparation method provided by the invention employs cheap and easily available sesbania powder as a mesoporous template, is simple and economic in preparation process and suitable for industrial production. The mesoporous beta zeolite prepared by using the method has mutually communicated mesopores in crystal grains, so the accessibility and molecule diffusion capability of the beta zeolite are improved, and the scope of application of the beta zeolite, especially to reactions among macro-molecules, is broadened.

Description

technical field [0001] The invention relates to a catalyst carrier, in particular to a mesoporous Beta zeolite and a preparation method thereof. Background technique [0002] Beta zeolite is the only large-pore high-silica zeolite with a three-dimensional twelve-membered ring straight channel system. Diffusion of volume molecules in it; Compared with low-silica zeolite Y zeolite, it has a larger range of adjustable silicon-aluminum ratio, which makes it exhibit higher hydrothermal stability and strong acidity. In conclusion, due to its unique crystal structure and composition, Beta zeolite exhibits excellent performance in terms of hydrothermal stability, molecular shape selectivity, active site stability, coking resistance, and hydrophobicity, and can be used as a catalyst for low-pressure hydrocracking , hydroisomerization, dewaxing, aromatization, olefins, aromatics isomerization and hydrocarbon conversion and other industrial catalytic processes. [0003] However, like...

Claims

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Application Information

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IPC IPC(8): C01B39/48B01J29/70
CPCB01J29/7007C01B39/48C01P2006/12C01P2006/14C01P2006/16
Inventor 明卫星石友良许莉冯春峰王春锋杨伟光赖波
Owner WUHAN KAIDI ENG TECH RES INST CO LTD
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