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Nanoscale Sn-Beta molecular sieve and preparation method thereof

A molecular sieve and nano-scale technology, applied in chemical synthesis technology and its application fields, can solve the problems of tin atom repair, influence on catalytic performance, hydrophilicity enhancement, etc., achieve the effect of promoting hydrolysis, small particle size, and avoiding miscellaneous crystals

Active Publication Date: 2021-04-13
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of defect sites generated by this synthesis strategy during the dealumination process cannot be completely repaired by tin atoms, resulting in enhanced hydrophilicity, which also affects its catalytic performance to a certain extent.

Method used

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  • Nanoscale Sn-Beta molecular sieve and preparation method thereof
  • Nanoscale Sn-Beta molecular sieve and preparation method thereof

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preparation example Construction

[0032] The invention provides a kind of preparation method of nanoscale Sn-Beta molecular sieve, comprises the following steps:

[0033] 1) Under the condition of 300-700°C, perform high-temperature hydrothermal treatment on the Beta seed crystal, and the treatment time is 0.5-100h;

[0034] 2) Under stirring conditions, mix the Beta seed crystals that have undergone high-temperature hydrothermal treatment with an acid solution with a concentration of 1-12mol / L in a mass ratio of 1:1-10, and impregnate them under the condition of 20-100°C Treat for 0.5-100 hours, wash the seed crystals after acid dipping treatment until neutral;

[0035] 3) Tetraethylammonium fluoride is uniformly mixed with a precipitating agent and deionized water, and then a silicon source and a treated Beta seed crystal are added thereto to form a crystallization precursor mixture, and each component in the crystallization precursor mixture is The molar ratio is nSiO2:nTEA + :precipitant:nH 2 O=1.0:0.20...

Embodiment 1

[0050] A preparation method of nanoscale Sn-Beta molecular sieve, comprising the following steps:

[0051] 1) Carrying out high-temperature hydrothermal treatment to the Beta seed crystal: under the atmosphere of air and water vapor, wherein the content of water vapor is 20%, the Beta seed crystal is hydrothermally treated at 540° C. for 6 hours;

[0052] 2) Under stirring conditions, the Beta seed crystals that have undergone high-temperature hydrothermal treatment were immersed in a 2mol / L nitric acid solution at 50°C for 12 hours. The solid-liquid mass ratio of the seed crystal solids to the acid solution was 1:5. The final seed crystals were washed with water until neutral and dried at 100°C;

[0053] 3) 79.30g of tetraethylammonium fluoride (in the form of TEA + ) mixed with 7.55g ethylenediamine and 31.32g deionized water, then add 25.18g white carbon black (as SiO 2 count) and 1.25g Beta seeds; nSiO 2 :nTEA + :precipitant:nH 2 O=1.0:0.8:0.30:8.0;

[0054] 4) quick...

Embodiment 2

[0059] A preparation method of nanoscale Sn-Beta molecular sieve, comprising the following steps:

[0060] 1) Carrying out high-temperature hydrothermal treatment to the Beta seed crystal: under the atmosphere of air and water vapor, wherein the content of water vapor is 20%, the Beta seed crystal is hydrothermally treated at 540° C. for 6 hours;

[0061] 2) Under stirring conditions, the Beta seed crystals that have undergone high-temperature hydrothermal treatment were immersed in a 2mol / L nitric acid solution at 50°C for 12 hours. The solid-liquid mass ratio of the seed crystal solids to the acid solution was 1:5. The final seed crystals were washed with water until neutral and dried at 100°C;

[0062] 3) 57.14g tetraethylammonium fluoride (in TEA + ) mixed with 5.44g ethylenediamine and 22.75g deionized water, and then added 59.87g tetraethyl orthosilicate (as SiO 2 meter) and 0.90g Beta seeds; nSiO 2 :nTEA + :precipitant:nH 2 O=1.0:0.8:0.30:8.0;

[0063] 4) quickly ...

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Abstract

The invention provides a preparation method of a nanoscale Sn-Beta molecular sieve. The method specifically comprises the following steps: pretreating a Beta seed crystal, uniformly mixing tetraethylammonium fluoride, a precipitant and deionized water, adding a silicon source and the treated Beta seed crystal to obtain a crystallized precursor mixture, transferring the mixture into a reaction kettle, crystallizing, adding a tin source and F-ions, and after the secondary crystallization is completed, filtering, washing, drying and roasting the crystallized product to obtain the nanoscale Sn-Beta molecular sieve raw powder. The Sn-Beta molecular sieve prepared in the invention has the characteristics of high crystallinity, good dispersibility, uniform particle size distribution, large nanometer crystal grain size and large specific surface area, and can be used as a covalent carrier of an SCR catalyst in catalytic purification of NOx in automobile exhaust.

Description

technical field [0001] The invention relates to chemical synthesis technology and its application field, in particular to a nanoscale Sn-Beta molecular sieve and a preparation method thereof. Background technique [0002] In the prior art, heteroatoms are introduced into the molecular sieve framework, especially the isomorphic substitution of transition metal ions with specific catalytic properties, because the metal ions are in an isolated and highly dispersed state on the molecular sieve framework, and at the same time Due to the interaction with the molecular sieve parent framework, they have special catalytic functions that conventional transition metal oxides do not have, and their performance is also obviously different from the original function of the parent molecular sieve, not only for the acidity and surface properties of zeolite catalysts It plays a regulating role, and at the same time, it is beneficial for the zeolite catalyst to realize multifunctional catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/08B82Y40/00B01J29/70B01D53/94B01D53/56
CPCC01B39/08B82Y40/00B01J29/7057B01D53/9418B01D2258/01C01P2004/64Y02A50/20
Inventor 于浩淼王于王贤彬王炳春李进
Owner CHINA CATALYST HLDG CO LTD