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Rare earth metal modified Cu-SSZ-13 molecular sieve and preparation method and application thereof

A technology of cu-ssz-13 and rare earth metals, which is applied in the field of molecular sieve preparation and environmental pollution control, can solve problems such as insufficient hydrothermal stability, achieve good catalytic activity and nitrogen selectivity, improve high temperature hydrothermal stability, water Thermal stability and high space velocity resistance

Active Publication Date: 2020-05-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention overcomes existing applicable to NH 3 -The problem of insufficient hydrothermal stability of Cu-SSZ-13 copper-based small-pore molecular sieve catalyst with low silicon-aluminum ratio prepared by one-step synthesis method using Cu-TEPA as template agent for SCR

Method used

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  • Rare earth metal modified Cu-SSZ-13 molecular sieve and preparation method and application thereof
  • Rare earth metal modified Cu-SSZ-13 molecular sieve and preparation method and application thereof
  • Rare earth metal modified Cu-SSZ-13 molecular sieve and preparation method and application thereof

Examples

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Embodiment 1

[0064] This example provides a method for modifying Cu-SSZ-13 molecular sieve with rare earth metal elements by ion exchange method, the prepared catalyst and its application. The specific steps of the method are as follows:

[0065] (1) A certain amount of Cu-SSZ-13 with a silicon-aluminum ratio of 4 synthesized by using Cu-TEPA as a template was added to the ammonium chloride solution with a concentration of 0.04mol / L, stirred in a water bath at 40°C for 5h, and the molecular sieve and chloride The solid-to-liquid ratio of the ammonium salt solution is 1g:40ml;

[0066] (2) After the ion exchange is completed, the obtained mixture is separated from solid and liquid, dried, and calcined at 600° C. for 6 hours to obtain Cu-SSZ-13 molecular sieve with moderate copper content;

[0067] (3) Place the molecular sieve obtained in step (2) in a 0.1mol / L cerium nitrate solution, and stir in a water bath at 80°C for ion exchange for 16 hours;

[0068] (4) After the ion exchange, the...

Embodiment 2

[0070]This embodiment provides a method for modifying a Cu-SSZ-13 molecular sieve with a rare earth metal element by an ion exchange method, a prepared catalyst and an application thereof. The specific steps of the method are as follows:

[0071] (1) A certain amount of Cu-SSZ-13 with a silicon-to-aluminum ratio of 4.2 synthesized by using Cu-TEPA as a template was added to an ammonium chloride solution with a concentration of 0.02 mol / L, and stirred in a water bath at 40 °C for 5 hours. The solid-liquid ratio of ammonium salt solution is 1g:40ml;

[0072] (2) After the ion exchange is completed, the obtained mixture is solid-liquid separated, dried, and calcined at 600° C. for 6 hours to obtain Cu-SSZ-13 molecular sieves with moderate copper content;

[0073] (3) placing the molecular sieve obtained in step (2) in a 0.1 mol / L samarium nitrate solution, and stirring in a water bath at 80° C. to perform ion exchange for 16 hours;

[0074] (4) After the ion exchange is complet...

Embodiment 3

[0076] This embodiment provides a method for modifying a Cu-SSZ-13 molecular sieve with a rare earth metal element by an ion exchange method, a prepared catalyst and an application thereof. The specific steps of the method are as follows:

[0077] (1) A certain amount of Cu-SSZ-13 with a silicon-to-aluminum ratio of 5 synthesized by using Cu-TEPA as a template was added to a solution of ammonium chloride with a concentration of 0.015 mol / L, and stirred in a water bath at 40 °C for 5 hours. The solid-liquid ratio of ammonium salt solution is 1g:100ml;

[0078] (2) After the ion exchange is completed, the obtained mixture is solid-liquid separated, dried, and calcined at 600° C. for 6 hours to obtain Cu-SSZ-13 molecular sieves with moderate copper content;

[0079] (3) placing the molecular sieve obtained in step (2) in a 0.1 mol / L samarium nitrate solution, and stirring in a water bath at 80° C. for ion exchange for a duration of 16 hours;

[0080] (4) After the ion exchange ...

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Abstract

The invention discloses a rare earth metal modified Cu-SSZ-13 molecular sieve and a preparation method and application thereof. The rare earth metal modified Cu-SSZ-13 comprises a Cu-SSZ-13 molecularsieve which is prepared after ion exchange of a Cu-SSZ-13 molecular sieve prepared by a one-step synthesis method and with a silica-alumina ratio of 3-5, and rare earth metal ions modified at ion exchange sites in a skeleton of the Cu-SSZ-13 molecular sieve. According to the invention, the used raw materials are non-toxic and harmless, the preparation method is simple, and the synthesized catalysthas characteristics of good NH3-SCR catalytic activity, good nitrogen selectivity, good hydrothermal stability and high space velocity resistance, and is suitable for diesel exhaust nitrogen oxide removal and stationary source flue gas denitrification.

Description

technical field [0001] The invention belongs to the fields of molecular sieve preparation and environmental pollution control, relates to a rare earth metal modified Cu-SSZ-13 molecular sieve and a preparation method and application thereof, in particular to a rare earth metal modified aluminum-rich Cu-SSZ-13 molecular sieve catalyst and a preparation method thereof and applications for denitrification in flue gas from stationary sources and / or tail gas from mobile sources. Background technique [0002] Nitrogen oxides (NOx) are an important pollutant in the atmosphere and play an important role in the formation of air pollution phenomena such as haze and photochemical smog. The sources of nitrogen oxides are divided into natural sources and anthropogenic sources. Among them, anthropogenic emissions are mainly divided into stationary sources and mobile sources. The latter is difficult to control because of its large and scattered emissions. Among stationary and mobile sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01D53/86B01D53/56
CPCB01J29/763B01D53/8628
Inventor 贺泓王莹洁石晓燕余运波单玉龙
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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