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Ammonia-selective preparation method of SAPO-34 supported Cu-Fe catalyst for catalytically removing NOx

A SAPO-34, selective technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., to achieve high anti-coking performance, high hydrothermal stability, and stable catalyst 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 SAPO-34 molecular sieves as a carrier is even rarer.

Method used

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  • Ammonia-selective preparation method of SAPO-34 supported Cu-Fe catalyst for catalytically removing NOx
  • Ammonia-selective preparation method of SAPO-34 supported Cu-Fe catalyst for catalytically removing NOx
  • Ammonia-selective preparation method of SAPO-34 supported Cu-Fe catalyst for catalytically removing NOx

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Embodiment 1

[0020] (1) Preparation of SAPO-34

[0021] Aluminum isopropoxide (Al(OC 3 h 7 ) 3 ), phosphoric acid solution and concentrated hydrochloric acid solution were dissolved in water to form a solution, and stirred evenly, and stood at room temperature for 5 days, then added silica sol to the above solution, and stirred evenly, then added tetraethylammonium hydroxide solution, stirred evenly , finally obtain the sol composition ratio (molar molecular weight ratio) as follows:

[0022] 1.39 (TEA) 2 O:0.2SiO 2 : 1.0Al 2 o 3 : 0.88P 2 o 5 : 0.21HCl

[0023] The above sol was left at room temperature for 5 days, and then the sol was added to a stainless steel reactor lined with polytetrafluoroethylene, heated to 200°C, and kept at a constant temperature for 80 hours. The solid product was then filtered, washed and dried in air at 30°C. In order to remove the template agent and other impurities, the obtained solid matter was calcined at 400° C. for 15 hours in an oxygen atmos...

Embodiment 2

[0030] (1) Preparation of SAPO-34

[0031] Aluminum isopropoxide (Al(OC 3 h 7 ) 3 ), phosphoric acid solution and concentrated hydrochloric acid solution were dissolved in water to form a solution, and stirred evenly, and stood at room temperature for 7 days, then added silica sol to the above solution, and stirred evenly, then added tetraethylammonium hydroxide solution, stirred evenly , finally obtain the sol composition ratio (molar molecular weight ratio) as follows:

[0032] 1.11 (TEA) 2 O: 0.33SiO 2 : 1.0Al 2 o 3 : 0.71P 2 o 5 : 0.17HCl

[0033] The above sol was left at room temperature for 7 days, and then the sol was added to a stainless steel reactor lined with polytetrafluoroethylene, heated to 220°C, and kept at a constant temperature for 90 hours. The solid product was then filtered, washed and dried in air at 50°C. In order to remove the template agent and other impurities, the obtained solid matter was calcined at 500° C. for 18 hours in an oxygen atm...

Embodiment 3

[0040] (1) Preparation of SAPO-34

[0041] Aluminum isopropoxide (Al(OC 3 h 7 ) 3 ), phosphoric acid solution and concentrated hydrochloric acid solution were dissolved in water to form a solution, and stirred evenly, and stood at room temperature for 8 days, then added silica sol to the above solution, and stirred evenly, then added tetraethylammonium hydroxide solution, stirred evenly , finally obtain the sol composition ratio (molar molecular weight ratio) as follows:

[0042] 0.83(TEA) 2 O: 0.31SiO 2 : 1.0Al 2 o 3 : 0.66P 2 o 5 : 0.16HCl

[0043] The above sol was left at room temperature for 8 days, and then the sol was added to a stainless steel reactor lined with polytetrafluoroethylene, heated to 230°C, and kept at a constant temperature for 100 hours. The solid product was then filtered, washed and dried in air at 70°C. In order to remove the template agent and other impurities, the obtained solid matter was calcined at 500° C. for 18 hours in an oxygen atm...

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Abstract

The invention relates to an ammonia-selective preparation method of an SAPO-34 supported Cu-Fe catalyst for catalytically removing NOx. The catalyst is used for catalytically removing oxynitrides. A soft template method is used for preparing the SAPO-34 micropore molecular sieve carrier with high specific area (400-550m<2> / g); and an iron chloride-copper chloride mixed solution and an SAPO-34 molecular sieve ion-exchange method are utilized to prepare the SAPO-34 molecular sieve supported Cu-Fe composite catalyst. In a wide temperature range (150-550), the invention has high catalytic removal effect and high stability for pollutants with high air speed (120000-360000mL.(g.h)<-1>), high O2 concentration (10-10 vl.%), high H2O content (5-10 wt%) and low NO concentration (300-1000ppm). After adding hydrocarbons (300-1000ppm of propylene) into the reaction system, the catalyst provided by the invention has high anti-carbon performance and high hydrothermal stability.

Description

technical field [0001] The invention relates to a preparation method of SAPO-34 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 oxyge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/56B01D53/86B01D53/94
CPCY02C20/10
Inventor 叶青王海平程水源王道康天放
Owner BEIJING UNIV OF TECH
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