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Encapsulated molecular sieve metal catalyst as well as preparation method and application thereof

A metal catalyst, molecular sieve technology, applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of active particle aggregation loss, activity decline, uncontrollable active particle size, etc., achieving low cost, long life, and preparation. simple method effect

Active Publication Date: 2021-02-02
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The size of the active particles of this catalyst is uncontrollable, and the active particles on the surface of the molecular sieve are prone to aggregation and loss during the reaction process, resulting in a decrease in activity
Therefore, the preparation of highly active and long-lived zeolite catalysts for N2O decomposition remains a challenge.

Method used

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  • Encapsulated molecular sieve metal catalyst as well as preparation method and application thereof
  • Encapsulated molecular sieve metal catalyst as well as preparation method and application thereof
  • Encapsulated molecular sieve metal catalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0029] A method for preparing an encapsulated molecular sieve metal catalyst provided by an aspect of the embodiments of the present invention includes:

[0030] At least uniformly mixing the metal salt precursor with water or an aqueous solution containing an organic amine to form an aqueous metal salt solution or a complex metal salt solution;

[0031] mixing the metal salt solution or the complex metal salt solution with at least the mother liquor used to synthesize molecular sieves, and then performing a hydrothermal reaction to obtain an intermediate product containing molecular sieves;

[0032] The intermediate product is subjected to high-temperature treatment, and the generated metal clusters or metal nanoparticles are evenly distributed in the pores or cage structures of the molecular sieve crystals to obtain an encapsulated molecular sieve metal catalyst.

[0033] In some preferred embodiments, the preparation steps of the encapsulated metal molecular sieve catalyst:...

Embodiment 1

[0076] In this example, the Rh@S-1 molecular sieve catalyst uses ethyl orthosilicate (TEOS), rhodium nitrate, ethylenediamine and deionized water as raw materials, and tetrapropylammonium hydroxide (TPAOH) as template agent. The ratio is 1.0 tetraethyl orthosilicate : 0.4TPAOH : 35H 2 O: 0.0045 [Rh(NH 2 CH 2 CH 2 NH 2 ) 3 ](NO 3 ) 3 , the preparation process of the Rh@S-1 molecular sieve catalyst is as follows: (1) mix rhodium nitrate, ethylenediamine and water, stir to make it fully dissolve to obtain solution A, the amount of rhodium nitrate is 0.0045 of the silicon source molar ratio, and ethylenediamine The amount of amine is 50 times of the molar amount of rhodium nitrate; (2) Dissolve the template agent in water, stir to make it fully dissolved to obtain an aqueous solution, and then add silicon source tetraethyl orthosilicate to the above solution and continue to stir evenly to obtain a synthetic molecular sieve Mother liquor B; (3) Add solution A to mother liquo...

Embodiment 2

[0079] In this embodiment, the Fe@SSZ-13 molecular sieve catalyst uses silica sol, aluminum sulfate, sodium hydroxide, deionized water, iron nitrate and ethylenediamine as raw materials, and N, N, N-trimethyladamantane ammonium hydroxide ( TMAdaOH) is a template, and the molar ratio of each raw material is 40SiO 2 : 1 aluminum sulfate: 16 sodium hydroxide: 5TMAdaOH: 900H 2 O:4[Fe(DETA) 3 ](NO 3 ) 3 , the preparation process of Fe@SSZ-13 molecular sieve catalyst is as follows: (1) Mix ferric nitrate, ethylenediamine and water, stir to fully dissolve to obtain solution A, the amount of ferric nitrate is 0.1 of the molar ratio of silicon source, ethylenediamine The amount of amine is 20 times of the molar amount of ferric nitrate; (2) dissolving template agent in water, stirring to dissolve fully to obtain an aqueous solution, and then adding silicon source, aluminum source and sodium hydroxide to the above solution and continuing to stir evenly to obtain Molecular sieve synt...

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Abstract

The invention discloses an encapsulated molecular sieve metal catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: at least uniformlymixing a metal salt precursor with water or an aqueous solution containing organic amine to form a metal salt aqueous solution or a complex metal salt aqueous solution; mixing the aqueous solution with mother liquor at least used for synthesizing a molecular sieve, and then carrying out hydrothermal reaction to obtain an intermediate product containing the molecular sieve; and carrying out high-temperature treatment on the intermediate product, and uniformly distributing generated metal clusters or metal nanoparticles in pore channels or cage-shaped structures of molecular sieve crystals to obtain the encapsulated molecular sieve metal catalyst. The preparation method of the encapsulated molecular sieve metal catalyst for catalytic decomposition of nitrous oxide is simple, and the prepared encapsulated molecular sieve metal catalyst has the advantages of being green, non-toxic, low in cost, high in activity, long in service life and the like, can be used for catalytic decomposition and removal of nitrous oxide in fixed and / or mobile source tail gas, and is wide in application prospect.

Description

technical field [0001] The invention relates to a molecular sieve metal catalyst, in particular to an encapsulated molecular sieve metal catalyst for low-temperature decomposition of nitrous oxide and its preparation method and application, belonging to industrial greenhouse gas nitrous oxide pollution emission reduction and control, and environmental catalysis technology field. Background technique [0002] Nitrous oxide (N 2 O, also known as laughing gas) is the third-largest anthropogenic greenhouse gas and the largest stratospheric ozone-depleting substance. N 2 O is a gas with a strong greenhouse effect, and its greenhouse effect is carbon dioxide (CO 2 ) 310 times. And N 2 The lifetime of O in the atmosphere is as long as 114 years, and the damage to the ozone layer is extremely significant. N 2 O emissions include natural biological emissions and emissions caused by human activities, of which the natural emissions of N 2 The nitrogen content in O is about 11 m...

Claims

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Application Information

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IPC IPC(8): B01J29/44B01J29/12B01J29/03B01J29/74B01J29/85B01D53/94B01D53/86B01D53/56
CPCB01J29/44B01J29/85B01J29/126B01J29/74B01J29/0325B01D53/8628B01D53/9413Y02C20/10
Inventor 尹宏峰王石维
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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