Preparation method and application of auxiliary metal-doped Cu-SAPO-18 catalyst

A metal doping and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve simple preparation process, improve catalytic activity, and promote redispersion

Inactive Publication Date: 2017-09-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the use of additives to dope Cu-SAPO-18. The present invention explores the preparation method of additive metal-doped Cu-SAPO-18 catalysts to improve the activity and hydrothermal stability of the catalysts.

Method used

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  • Preparation method and application of auxiliary metal-doped Cu-SAPO-18 catalyst
  • Preparation method and application of auxiliary metal-doped Cu-SAPO-18 catalyst
  • Preparation method and application of auxiliary metal-doped Cu-SAPO-18 catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Dissolve 18g of ammonium nitrate in 100ml of deionized water to form an ammonium nitrate solution, then slowly add 5g of H-SAPO-18 molecular sieve into the above solution, exchange at 80°C for 6h, filter, wash, and Dry at 90°C to get 6gNH 4 -SAPO-18 molecular sieve;

[0023] (2) 0.3g of Cu(NO 3 ) 2 ·3H 2 O was dissolved in 8ml of deionized water to form a copper nitrate solution, and then 3g of NH 4 - SAPO-18 molecular sieves were slowly added to the above solution, ultrasonicated for 2 hours, allowed to stand at room temperature for 24 hours, dried at 100°C, and calcined at 600°C for 6 hours to obtain 3g of Cu-SAPO-18 catalyst powder;

[0024] (3) 0.142g of Ce(NO 3 ) 3 ·6H 2 O was dissolved in 4ml of deionized water to form a cerium nitrate solution, and then 2.5g of Cu-SAPO-18 catalyst powder was added to the above solution. After ultrasonication for 2h, it was allowed to stand at room temperature for 24h and dried at 100°C to obtain The solid was calcined...

Embodiment 2-5

[0026](1) Dissolve 18g of ammonium nitrate in 100ml of deionized water to form an ammonium nitrate solution, then slowly add 5g of H-SAPO-18 molecular sieve into the above solution, exchange at 80°C for 6h, filter, wash, and Dry at 90°C to get NH 4 - SAPO-18 molecular sieves.

[0027] (2) 0.3g of Cu(NO 3 ) 2 ·3H 2 O was dissolved in 8ml of deionized water to form a copper nitrate solution, and then 3g of NH 4 - SAPO-18 molecular sieves were slowly added to the above solution, ultrasonicated for 2 hours, left standing at room temperature for 24 hours, dried at 100°C, and calcined at 600°C for 6 hours to obtain Cu-SAPO-18 catalyst.

[0028] (3) 0.216g of Zr(NO 3 ) 4 ·5H 2 O, 0.332g of Fe(NO 3 ) 3 9H 2 O, 0.210g of Mn(NO 3 ) 2 4H 2 O, 0.354g of Cr(NO 3 ) 3 9H 2 O was dissolved in 4ml of deionized water to form nitrate solutions of Zr, Fe, Mn, and Cr respectively, and then 2.5g of Cu-SAPO-18 catalyst was added to the above solution. After ultrasonication for 2h, it...

Embodiment 6-9

[0030] (1) Dissolve 18g of ammonium nitrate in 100ml of deionized water to form an ammonium nitrate solution, then slowly add 5g of H-SAPO-18 molecular sieve into the above solution, exchange at 80°C for 6h, filter, wash, and Dry at 90°C to get NH 4 - SAPO-18 molecular sieves.

[0031] (2) 0.3g of Cu(NO 3 ) 2 ·3H 2 O was dissolved in 8ml of deionized water to form a copper nitrate solution, and then 3g of NH 4 - SAPO-18 molecular sieves were slowly added to the above solution, ultrasonicated for 2 hours, left standing at room temperature for 24 hours, dried at 100°C, and calcined at 600°C for 6 hours to obtain Cu-SAPO-18 catalyst.

[0032] (3) 0.047g, 0.094g, 0.142g, 0.191g of Ce(NO 3 ) 3 ·6H 2 O was dissolved in 4ml of deionized water to form cerium nitrate solutions with different contents, and then 2.5g of Cu-SAPO-18 catalyst was added to the above solution, after ultrasonication for 2h, let stand for 24h, and dry at 100°C to obtain The solid was calcined at 600°C f...

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Abstract

The invention provides a preparation method and application of an auxiliary metal-doped Cu-SAPO-18 catalyst. The preparation method comprises the following steps: firstly, performing hydrothermal synthesis to obtain H-SAPO-18, then performing ion exchange and impregnation to obtain a Cu-SAPO-18 catalyst, and finally adding the Cu-SAPO-18 into a salt solution of auxiliary metal to obtain the metal-doped Cu-SAPO-18 catalyst according to an impregnation method. The invention further provides the optimal content of the auxiliary metal, and the auxiliary metal is applied to selective catalytic reduction of nitrogen oxide through NH3, so that the catalytic activity, the hydrothermal stability and SO2 poisoning resistance of the original Cu-SAPO-18 catalyst are improved; the preparation process of the catalyst provided by the invention is simple, and easy to repeat and operate.

Description

technical field [0001] The present invention relates to the control technology of nitrogen oxides in diesel vehicles, more specifically, to a preparation method of Cu-SAPO-18 catalyst doped with additives, and its application to selective catalytic reduction of nitrogen oxides by ammonia . Background technique [0002] Nitrogen oxides (NO x ) emissions will cause environmental pollution and endanger human health. In numerous control NO x Emission Technology, NH 3 -SCR is considered to remove NO from stationary and mobile sources due to its advantages of high efficiency, good selectivity, and low cost x One of the most reliable technologies. Catalysts play a pivotal role in this technology. In particular, very efficient catalysts are required to meet diesel vehicle emission standards, which must meet: a wide activity window, high N 2 Selectivity, good hydrothermal stability and environmental friendliness. In 2005 V 2 o 5 -WO 3 / TiO 2 The catalyst has been successf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01D53/94B01D53/56
CPCB01D53/9418B01D2251/2062B01D2258/012B01J29/85B01J2229/186
Inventor 李涛明淑君范驰陈真
Owner HUAZHONG UNIV OF SCI & TECH
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