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Preparation method for SCR catalyst for purifying oxynitride in motor vehicle exhaust

A technology of SCR catalyst and nitrogen oxides, which is applied in the field of preparation of molecular sieve catalysts, can solve the problems that are not conducive to the industrial production and large-scale application of Cu-SSZ-13, increase the cost of SSZ-13, and complicate the process of active components, etc., and achieve Good prospects for industrial application, excellent catalytic activity, and the effect of shortening the crystallization time

Inactive Publication Date: 2016-08-10
ZHEJIANG FORSOL ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the activity of the obtained catalyst is good, the process of loading the active component Cu on the molecular sieve through ion exchange in the preparation process is complicated, a large amount of waste water is generated during the ion exchange and washing process, the utilization rate of the active component is low, and it is difficult to achieve the target through one exchange. The shortcomings of uploading volume and long preparation period cannot be overcome
Simultaneously, the templating agent N,N,N-trimethyl-1-adamantyl ammonium hydroxide (TMAdaOH) used in the synthesis of SSZ-13 is expensive, which greatly increases the cost of SSZ-13, which is not conducive to Cu-SSZ-13 Industrial production and large-scale application as SCR catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Preparation of SSZ-13 molecular sieve:

[0026] Dissolve 163.2g of sodium hydroxide in 10.26L of deionized water, stir to dissolve it completely, and then 380.4g of USY molecular sieve (CBV-720, silicon aluminum ratio SiO 2 / Al 2 o 3 =30) Add the above-mentioned sodium hydroxide solution as silicon source and aluminum source, continue stirring until uniform, then add 10 wt% SSZ-13 seed crystals relative to USY molecular sieve, continue stirring for 1-3h, then transfer the obtained gel into In a polytetrafluoroethylene-lined stainless steel reactor, crystallize at 150°C for 40 hours, cool to room temperature after the reaction is completed, filter the product and wash it with deionized water, dry it at 100°C for more than 12 hours, and exchange it with ammonium nitrate And calcined at 550°C for 8 hours to obtain hydrogen-type SSZ-13 molecular sieve.

[0027] The above-mentioned ammonium nitrate exchange process is as follows: prepare 500ml of 0.1mol / L ammonium nitr...

Embodiment 2

[0035] 1) Preparation of SSZ-13 molecular sieve:

[0036] Dissolve 163.2g of sodium hydroxide in 10.26L of deionized water, stir to dissolve it completely, and then 380.4g of USY molecular sieve (CBV-720, silicon aluminum ratio SiO 2 / Al 2 o 3 =30) Add the above-mentioned sodium hydroxide solution as silicon source and aluminum source, continue stirring until uniform, then add 10 wt% SSZ-13 seed crystals relative to USY molecular sieve, continue stirring for 1-3h, then transfer the obtained gel into In a polytetrafluoroethylene-lined stainless steel reaction kettle, crystallize at 140°C for 50 hours, cool to room temperature after the reaction is completed, filter the product, wash it with deionized water, dry it at 100°C for more than 12 hours, and exchange it with ammonium nitrate And calcined at 550° C. for 8 hours to obtain a hydrogen-type SSZ-13 molecular sieve, wherein the exchange of ammonium nitrate is the same as in Example 1.

[0037] 2) Preparation of Cu-SSZ-13 m...

Embodiment 3

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

[0045] Dissolve 163.2g of sodium hydroxide in 10.26L of deionized water, stir to dissolve it completely, and then 380.4g of USY molecular sieve (CBV-720, silicon aluminum ratio SiO 2 / Al 2 o 3 =30) Add the above-mentioned sodium hydroxide solution as silicon source and aluminum source, continue stirring until uniform, then add 10 wt% SSZ-13 seed crystals relative to USY molecular sieve, continue stirring for 1-3h, then transfer the obtained gel into In a polytetrafluoroethylene-lined stainless steel reactor, crystallize at 150°C for 50 hours, cool to room temperature after the reaction is completed, filter the product and wash it with deionized water, dry it at 100°C for more than 12 hours, and exchange it with ammonium nitrate And calcined at 550° C. for 8 hours to obtain a hydrogen-type SSZ-13 molecular sieve, wherein the exchange of ammonium nitrate is the same as in Example 1.

[0046] 2) Preparation of Cu-SSZ-13 molecu...

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Abstract

The invention discloses a preparation method for an SCR catalyst for purifying oxynitride in motor vehicle exhaust .The preparation method includes the steps of preparation of an SSZ-13 molecular sieve, preparation of a Cu-SSZ-13 catalyst and preparation of an integrated SCR catalyst .The preparation method is simple, production cost is lowered, SSZ-13 crystallization time is short, crystallization is relatively pure, HN3-SCR catalytic activity is high, and the purification rate of oxynitride in motor vehicle exhaust is high.

Description

technical field [0001] The invention belongs to the field of preparation of molecular sieve catalysts, in particular to a method for preparing an SCR catalyst used for purifying nitrogen oxides in motor vehicle exhaust. Background technique [0002] The most widely used nitrogen oxide purification technology in the world is to use HN 3 for selective catalytic reduction, that is, HN 3 -SCR (Selective Catalytic Reduction, SCR) technology, using ammonia as a reducing agent to selectively catalytically reduce harmful nitrogen oxides to harmless N 2 and H 2 O. The core of SCR technology is to develop catalysts with excellent catalytic performance. NH 3 -SCR technology was initially applied in the field of stationary source denitrification, and has been successfully introduced into the field of motor vehicle exhaust gas treatment. At present, the SCR catalysts for industrial application are mainly WO 3 or MoO 3 Doped V 2 o 5 / TiO 2 catalyst. But there are many problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01D53/94B01D53/56
CPCB01D53/9418B01D2258/01B01J29/76B01J2229/26Y02A50/20Y02T10/12
Inventor 李可
Owner ZHEJIANG FORSOL ENERGY
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