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Hierarchical pore molecular sieve, and preparation method and application thereof

A molecular sieve and multi-stage pore technology, applied in the field of porous materials, can solve the problems of low mass transfer efficiency, single molecular sieve pore structure, and low adsorption capacity

Inactive Publication Date: 2020-09-11
BEIJING LONGTAO ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, zeolite molecular sieves and their supported catalysts have made some progress in the removal of VOCs, and a series of adsorption materials with excellent performance have been developed, but there are many problems and challenges: (1) The molecular sieve has a single pore structure, which prevents molecules from being larger than the pore channels The diameter of the VOCs component is adsorbed, and the adsorption capacity is low; (2) After the VOCs component is adsorbed, the mass transfer efficiency is low

Method used

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  • Hierarchical pore molecular sieve, and preparation method and application thereof
  • Hierarchical pore molecular sieve, and preparation method and application thereof
  • Hierarchical pore molecular sieve, and preparation method and application thereof

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preparation example Construction

[0064] In another preferred embodiment, the present invention provides a method for synthesizing a hierarchically porous molecular sieve HZSM-5. The HZSM-5 molecular sieve has high adsorption capacity for VOCs components.

[0065] Preferably, the high adsorption performance HZSM-5 molecular sieve is made of tetraethyl silicate (TEOS), aluminum isopropoxide Al (i-PrO) 3 , tetrapropylammonium hydroxide (TPAOH), cyclic organic compounds, such as β-cyclodextrin (β-CD), polyether F127 or calixarene cyclic organic compounds as raw materials, through steam-assisted synthesis, to obtain High adsorption performance HZSM-5 molecular sieve.

[0066] In another preferred embodiment, the present invention provides a molecular sieve with hierarchical pores, which is characterized by high adsorption capacity HZSM-5 molecular sieve.

[0067] Preferably, in the above-mentioned high adsorption capacity HZSM-5 molecular sieve, the adsorption capacity of the HZSM-5 molecular sieve to VOCs compon...

Embodiment 1

[0075] Embodiment 1: the preparation of HZSM-5 (polyether F127 is hard templating agent) molecular sieve

[0076] (1) Add 2.0g of F127 into 50g of deionized water and stir until completely dissolved.

[0077] (2) After adding 0.50g aluminum isopropoxide (2.48mmol) and 20.8g TEOS (100.0mmol) and stirring vigorously (stirring speed 200r / min) for 4 hours, add 5.1gTPAOH dropwise (20 drops / min), 40°C Continue to stir (stirring speed is 200r / min) to solidify into gel.

[0078] (3) The gel was dried at 60° C. for 8 hours, and then dried at 80° C. for 12 hours until the quality of the gel did not change to obtain a xerogel.

[0079] (4) The xerogel was crystallized at 160° C. for 18 hours by a steam-assisted method, and the product was filtered, washed, and dried at 100° C. overnight.

[0080] Among them, the process of the steam-assisted method is: put the dry gel into the polytetrafluoroethylene liner (volume 120mL) of the autoclave, add 5-15mL water to the 20mL glass sample bottl...

Embodiment 2

[0093]Embodiment 2: Preparation of HZSM-5 (beta-CD is a hard template) molecular sieve

[0094] (1) Add 2.0g of β-CD into 50g of deionized water and stir until completely dissolved.

[0095] (2) After adding 0.25g aluminum isopropoxide (1.24mmol) and 10.4g TEOS (49.92mmol) and stirring vigorously (stirring speed: 200r / min) for 4 hours, add 5.1gTPAOH dropwise (20 drops / min) at 40°C Continue to stir (stirring speed is 200r / min) to solidify into gel.

[0096] (3) The gel was dried at 60° C. for 8 hours, and then dried at 80° C. for 12 hours until the quality of the gel did not change to obtain a xerogel.

[0097] (4) The xerogel was crystallized at 160° C. for 18 hours by a steam-assisted method, and the product was filtered, washed, and dried at 100° C. overnight.

[0098] (5) Calcining at 600°C for 10 hours to remove the organic template, and obtain a multi-order pore molecular sieve HZSM-5.

[0099] The schematic diagram of the molecular structure of β-CD used in this examp...

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Abstract

The invention relates to a hierarchical pore molecular sieve, and a preparation method and application thereof. The hierarchical pore molecular sieve is prepared from a silicon source, an aluminum source, a hard template, an organic alkali and water, the hard template comprises a cyclic organic compound, and the cyclic organic compound is selected from beta-cyclodextrin, crown ether, polyether andcalixarene cyclic organic compounds. The preparation method comprises the following steps: dissolving the hard template in water, adding the aluminum source and the silicon source, uniformly mixing,adding the organic alkali, curing to form gel, crystallizing and roasting the gel, and removing the template to obtain the hierarchical pore molecular sieve. The hierarchical pore molecular sieve provided by the invention can effectively improve the adsorption capacity of volatile organic compounds and enhance the mass transfer efficiency, and the preparation method is simple in process and easy for large-scale preparation.

Description

technical field [0001] The invention relates to the technical field of porous materials, mainly to the technical field of molecular sieves, and in particular to a multi-stage pore molecular sieve and its preparation method and application. Background technique [0002] Volatile organic compounds (VOCs) are a general term for a class of organic compounds, referring to organic compounds with a saturated vapor pressure > 70Pa at room temperature and a boiling point of 50-260 °C at normal pressure. These compounds have a great impact on human health. harm. The types of VOCs include ketones, hydrocarbons, alcohols and lipids. The anthropogenic emissions of VOCs mainly come from industrial activities using organic solvents, fuel combustion and transportation engineering. According to statistics, the emission of VOCs in my country is very large, much higher than the emission of pollutants such as dust and sulfur dioxide. From the current point of view, my country's VOCs emiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40B01D53/02C02F1/28B01J29/40B01J35/10
CPCC01B39/40B01D53/02C02F1/281B01J29/40B01D2257/708C01P2006/14C01P2006/12C01P2006/16C01P2006/19C01P2004/03C01P2002/72B01J2229/14B01J35/617B01J35/633B01J35/635B01J35/643B01J35/647B01J35/615
Inventor 喻正保史东军赵雪源徐纪清柴磊昌邵建伟骆坚平郭行潘涛
Owner BEIJING LONGTAO ENVIRONMENTAL TECH CO LTD
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