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Preparation method of SSZ-13 loaded Cu-Fe catalyst for selectively catalyzing and eliminating NOx by ammonia

A catalyst, selective technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., to achieve high hydrothermal stability, high stability, and stable activity.

Inactive Publication Date: 2012-08-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on the simultaneous use of copper and iron-supported catalysts at home and abroad. According to all the reported literatures, although they have good activity, most of them use copper or iron-supported catalysts, while Cu and Fe-supported catalysts catalyze the treatment of NO. There are very few reports, and the use of SSZ-13 molecular sieves as a carrier is even rarer.

Method used

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  • Preparation method of SSZ-13 loaded Cu-Fe catalyst for selectively catalyzing and eliminating NOx by ammonia
  • Preparation method of SSZ-13 loaded Cu-Fe catalyst for selectively catalyzing and eliminating NOx by ammonia
  • Preparation method of SSZ-13 loaded Cu-Fe catalyst for selectively catalyzing and eliminating NOx by ammonia

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Preparation of SSZ-13 molecular sieve

[0025] Dissolve sodium silicate solution and N,N,N-trimethyl-1-adamantammonium iodide R (N,N,N-trimethyl-1-adamantammonium iodide) in water to make the first solution, room temperature Let stand for 4 days. al 2 (SO 4 ) 3 .16H 2 O and concentrated NaOH aqueous solution were dissolved in water to make the second solution, which was allowed to stand at room temperature for 4 days. Add the second solution to the first solution, stir until uniform, obtain a milk-colored solution, and finally obtain the sol composition (molar molecular weight ratio) as follows:

[0026] 61SiO 2 : 1.0Al 2 o 3 :38Na 2 O:9.75R:1238H 2 o

[0027] The above solution was left to stand in an airtight container for 10 days. Then the sol was added to a stainless steel reactor lined with polytetrafluoroethylene, heated to 120°C, and kept at a constant temperature for 5 days. The solid product was then filtered, washed and dried in air at 30°C. ...

Embodiment 2

[0034] (1) Preparation of SSZ-13 molecular sieve

[0035] Dissolve sodium silicate solution and N,N,N-trimethyl-1-adamantammonium iodide R (N,N,N-trimethyl-1-adamantammonium iodide) in water to make the first solution, room temperature Let stand for 5 days. al 2 (SO 4 ) 3 .16H 2 O and concentrated NaOH aqueous solution were dissolved in water to make the second solution, and left at room temperature for 5 days. Add the second solution to the first solution, stir until uniform, obtain a milk-colored solution, and finally obtain the sol composition (molar molecular weight ratio) as follows:

[0036] 30SiO 2 : 1.0Al 2 o 3 : 15Na 2 O: 4.88R: 960H 2 o

[0037] The above solution was left to stand in an airtight container for 12 days. Then the sol was added to a stainless steel reactor lined with polytetrafluoroethylene, heated to 140°C, and kept at a constant temperature for 7 days. The solid product was then filtered, washed and dried in air at 50°C. In order to remo...

Embodiment 3

[0044] (1) Preparation of SSZ-13 molecular sieve

[0045] Dissolve sodium silicate solution and N,N,N-trimethyl-1-adamantammonium iodide R (N,N,N-trimethyl-1-adamantammonium iodide) in water to make the first solution, room temperature Let stand for 6 days. al 2 (SO 4 ) 3 .16H 2 O and concentrated NaOH aqueous solution were dissolved in water to make the second solution, which was allowed to stand at room temperature for 6 days. Add the second solution to the first solution, stir until uniform, obtain a milk-colored solution, and finally obtain the sol composition (molar molecular weight ratio) as follows:

[0046] 31SiO 2 : 1.0Al 2 o 3 : 17Na 2O: 3.9R: 968H 2 o

[0047] The above solution was left to stand in an airtight container for 13 days. Then the sol was added to a stainless steel reactor lined with polytetrafluoroethylene, heated to 160°C, and kept at a constant temperature for 6 days. The solid product was then filtered, washed and dried in air at 70°C. ...

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Abstract

The invention provides a preparation method of a SSZ-13 loaded Cu-Fe catalyst for selectively catalyzing and eliminating NOx by ammonia. The catalyst is used for catalyzing and eliminating nitrogen oxides. A micropore SSZ-13 molecular sieve carrier with high specific surface area (400-550 m2 / g) is prepared by using a soft template method. And then by using a mixed solution of ferric chloride and copper chloride as well as a SSZ-13 molecular sieve ion exchanging method, the SSZ-13 molecular sieve loaded Cu-Fe composite catalyst is prepared. According to the invention, within a wide temperature range (150-550 DEG C), high catalytic eliminating effect and higher stability are obtained for a pollutant with high airspeed (120, 000 mL. (g.h)-1 - 1-360,000 mL.(g.h)-1), high O2 concentration (10vl.%-20v1.%), high H2O content (5wt%-10wt%) and low concentration NO (300-1000 ppm). After a hydrocarbon compound (300-1000 ppm propylene) is added to a reaction system, the catalyst prepared by the preparation method provided by the invention has the advantages of high carbon deposition resistance and high hydrothermal stability.

Description

technical field [0001] The invention relates to a preparation method of a SAPO-13 loaded Cu-Fe composite catalyst and the application of selective catalytic elimination of nitrogen oxides. Background technique [0002] Nitrogen oxides (commonly known as NO x , mainly containing NO) is a major pollutant in the atmosphere, which has great harm to the ecological environment and human health. It not only causes acid rain, but also forms near-surface atmospheric ozone pollution, secondary fine particle pollution and surface water eutrophication The resulting environmental problems have become the most prominent atmospheric environmental hotspot issues together with the destruction of the ozone layer and global climate change. The main sources of nitrogen oxides are vehicle exhaust (mobile source) and coal-fired boilers in power plants (stationary source). In recent years, in order to improve the utilization rate of fuel, most of the internal combustion engines currently use oxy...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01D53/56B01D53/86B01D53/94
Inventor 叶青赵海霞程水源王道康天放
Owner BEIJING UNIV OF TECH
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