Preparation method of SAPO-18-carried Cu-Fe catalyst for ammonia-selective catalytic elimination of NOx

A SAPO-18, selective technology, used in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., to achieve the effects of simple preparation process, high anti-carbon performance, and high hydrothermal stability

Inactive Publication Date: 2012-08-08
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 nitrogen. There are very few reports on oxides, and the use of SAPO-18 molecular sieves as a carrier is even less reported

Method used

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  • Preparation method of SAPO-18-carried Cu-Fe catalyst for ammonia-selective catalytic elimination of NOx
  • Preparation method of SAPO-18-carried Cu-Fe catalyst for ammonia-selective catalytic elimination of NOx
  • Preparation method of SAPO-18-carried Cu-Fe catalyst for ammonia-selective catalytic elimination of NOx

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of SAPO-18 molecular sieve

[0023] Add aluminum hydroxide to phosphoric acid solution, stir evenly, let stand at room temperature for 5 days, then add SiO 2 and N, N-diisopropylethylamine (C 8 h 19 N) join in above mixed solution, stir, finally obtain sol composition (molar ratio) as follows:

[0024] 0.93C 8 h 19 N:0.33SiO2 2 : 0.44Al 2 o 3 : 0.35P 2 o 5 :33H 2 o

[0025] Put the sol in a closed container at room temperature for 5 days, then add it to a stainless steel reaction kettle lined with polytetrafluoroethylene, heat it to 160 ° C, keep the temperature for 5 days, then filter and wash the solid product, and put it in the air at 30 ° C dry. 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 atmosphere. The above prepared SAPO-18 molecular sieve carrier has a specific surface area of ​​400m 2 / g, total pore volume 0.25cm 3 / g.

[0026] (2) NH 4 P...

Embodiment 2

[0032] (1) Preparation of SAPO-18 molecular sieve

[0033] Add aluminum hydroxide to the phosphoric acid solution, stir evenly, let it stand at room temperature for 7 days, and then add SiO 2 and N, N-diisopropylethylamine (C 8 h 19 N) join in above mixed solution, stir, finally obtain sol composition (molar ratio) as follows:

[0034] 1.4C 8 h 19 N:0.60SiO2 2 : Al 2 o 3 : 0.79P 2 o 5 :40H 2 o

[0035] The sol was left at room temperature in an airtight container for 7 days, then added to a stainless steel reactor lined with polytetrafluoroethylene, heated to 170°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 remove the template agent and other impurities, the obtained solid matter was calcined at 500° C. for 15 hours in an oxygen atmosphere. The above prepared SAPO-18 molecular sieve carrier has a specific surface area of ​​440m 2 / g, total pore volume 0.31cm 3 / g.

[0036] (2...

Embodiment 3

[0042] (1) Preparation of SAPO-18 molecular sieve

[0043] Add aluminum hydroxide to the phosphoric acid solution, stir evenly, let stand at room temperature for 8 days, and then add SiO 2 and N, N-diisopropylethylamine (C 8 h 19 N) join in above mixed solution, stir, finally obtain sol composition (molar ratio) as follows:

[0044] 1.05C 8 h 19 N:0.45SiO2 2 : Al 2 o 3 : 0.78P 2 o 5 : 28H 2 o

[0045] The sol was left at room temperature in an airtight container for 8 days, then added to a stainless steel reactor lined with polytetrafluoroethylene, heated to 170°C, and kept at a constant temperature for 8 days. 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 550° C. for 18 hours in an oxygen atmosphere. The above prepared SAPO-18 molecular sieve carrier has a specific surface area of ​​510m 2 / g, total pore volume 0.33cm 3 / g.

[0046] (2)...

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Abstract

The invention discloses a preparation method of a SAPO-18-carried Cu-Fe catalyst for ammonia-selective catalytic elimination of NOx. The SAPO-18-carried Cu-Fe catalyst is used for selective catalytic elimination of nitric oxides. The preparation method is characterized in that SAPO-18 foraminate molecular sieve carriers having high specific surface areas of 400 to 550m<2>/g are prepared by a soft template synthesis method; and a FeCl3-CuCl2 mixed solution and the SAPO-18 foraminate molecular sieve carriers are prepared into the SAPO-18-carried Cu-Fe catalyst by an ion exchange method. In a wide temperature range of 150 to 550 DEG C, the SAPO-18-carried Cu-Fe catalyst has high catalytic elimination effects on pollutants having a high airspeed of 120000 to 360000mL.(g.h)<-1>, a high O2 concentration of 10 to 20vl.%, high H2O content of 5 to 10wt% and a low NO concentration of 300 to 1000ppm, and has high stability. After adding a hydrocarbon (300 to 1000ppm of propylene) into a reaction system, the SAPO-18-carried Cu-Fe catalyst has high carbon deposition resistance and high hydrothermal stability.

Description

technical field [0001] The invention relates to a preparation method of SAPO-18 molecular sieve loaded Cu-Fe composite catalyst and its use for 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 internal combustion engines currently use oxy...

Claims

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Application Information

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