Bimetallic Cu/Mn catalysts for selective catalytic reduction

A catalyst, selected technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, non-metallic elements, etc., can solve problems such as undesired products

Pending Publication Date: 2022-02-18
JOHNSON MATTHEY PLC
View PDF15 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Additionally, side reactions can lead to undesired products such as N 2 O, as represented by reaction (3)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bimetallic Cu/Mn catalysts for selective catalytic reduction
  • Bimetallic Cu/Mn catalysts for selective catalytic reduction
  • Bimetallic Cu/Mn catalysts for selective catalytic reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0163] Example 1 - Standard SCR

[0164] The molecular sieves are impregnated with metals using the required amount of manganese(II) acetate and / or copper(II) acetate dissolved in demineralized water. The metal-impregnated samples were dried overnight at 80°C and then calcined at 550°C for 4 hours in air. A catalyst with the following formulation was prepared:

[0165] • AEI zeolite with 1.5 wt% exchanged Cu and 1.5 wt% exchanged Mn (1.5Cu-1.5Mn.AEI)

[0166] • AEI zeolite with 2 wt% exchanged Cu and 2 wt% exchanged Mn (2Cu-2Mn.AEI)

[0167] · AEI zeolite with 3 wt% exchanged Cu (3Cu.AEI)

[0168] Granular samples of the powdered catalyst were then tested for NO under the following conditions x Conversion and N 2 O yield: 500ppmNH 3 , 500ppm NO, 0ppm NO 2 , 14%O 2 , 4.6%H 2 O, 5.0% CO 2 and a margin of N 2 , the airspeed is 90K h -1 . In the above gas mixture (NH 3 Except) the sample was heated from room temperature to 150°C. At 150°C, the NH 3 Add to the gas...

Embodiment 2

[0172] Example 2 - Fast SCR

[0173] The molecular sieves are impregnated with metals using the required amount of manganese(II) acetate and / or copper(II) acetate dissolved in demineralized water. The metal-impregnated samples were dried overnight at 80°C and then calcined at 550°C for 4 hours in air. A catalyst with the following formulation was prepared:

[0174] · AEI zeolite with 1.5 wt% exchanged Cu and 1.5 wt% exchanged Mn, 1.5Cu-1.5Mn.AEI

[0175] · AEI zeolite with 3 wt% exchanged Cu, 3Cu.AEI

[0176] Granular samples of the powdered catalyst were then tested for NO under the following conditions x Conversion and N 2 O yield: 500ppmNH 3 , 250ppm NO, 250ppm NO 2 , 14%O 2 , 4.6%H 2 O, 5.0% CO 2 and a margin of N 2 , the airspeed is 90K h -1 . In the above gas mixture (NH 3 Except) the sample was heated from room temperature to 150°C. At 150°C, the NH 3 Add to the gas mixture and keep the sample under these conditions for 30 min. Then at 5°C min -1 The ...

Embodiment 3

[0178] Example 3 - Slow SCR

[0179] The molecular sieves are impregnated with metals using the required amount of manganese(II) acetate and / or copper(II) acetate dissolved in demineralized water. The metal-impregnated samples were dried overnight at 80°C and then calcined at 550°C for 4 hours in air. A catalyst with the following formulation was prepared:

[0180] · AEI zeolite with 1.5 wt% exchanged Cu and 1.5 wt% exchanged Mn, 1.5Cu-1.5Mn.AEI

[0181] · AEI zeolite with 3 wt% exchanged Cu, 3Cu.AEI

[0182] Granular samples of the powdered catalyst were then tested for NO under the following conditions x Conversion and N 2 O yield: 500ppmNH 3 , 175ppm NO, 325ppm NO 2 , 14%O 2 , 4.6%H 2 O, 5.0% CO 2 and a margin of N 2 , the airspeed is 90K h -1 . In the above gas mixture (NH 3 Except) the sample was heated from room temperature to 150°C. At 150°C, the NH 3 Add to the gas mixture and keep the sample under these conditions for 30 min. Then at 5°C min -1The t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
pore sizeaaaaaaaaaa
porosityaaaaaaaaaa
Login to View More

Abstract

The invention provides a catalyst composition for treating an exhaust gas, the catalyst composition comprising a molecular sieve, the molecular sieve comprising exchanged copper and exchanged manganese.

Description

Background technique [0001] The present invention relates to catalysts and methods for converting nitrogen oxides in a gas, such as the exhaust of a lean-burn internal combustion engine of a vehicle, to nitrogen by contacting the nitrogen oxides with a nitrogen-containing reducing agent in the presence of a transition metal-containing molecular sieve catalyst. [0002] by nitrogen compounds such as ammonia or urea to No x Selective catalytic reduction (SCR) has been used in many applications, including industrial stationary applications. Recently, the NO based on SCR technology x Reduction systems are being developed in Europe, Japan and the US for many vehicular (mobile) applications, eg for treating diesel exhaust. [0003] in NH 3 Several chemical reactions take place in the SCR system, most of which represent NO x , especially NO and NO 2 Ideal reaction for reduction to nitrogen. The main reaction is represented by reaction (1). [0004] 4NO+4NH 3 +O 2 →4N 2 +6H ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(China)
IPC IPC(8): B01D53/94B01J29/48B01J29/76B01J29/78B01J29/04B01J29/46
CPCB01J29/044B01J29/045B01J29/76B01J29/78B01J29/763B01J29/783B01J29/7615B01J29/7815B01J29/46B01J29/48B01D53/9418Y02C20/10Y02T10/12Y02A50/20B01J29/00B01J35/0006B01J35/0046B01J35/10C01B39/00B01D2255/9032B01D53/9468B01D53/9472F01N3/2066B01J2229/183B01J2229/14B01D2255/2073B01D2255/20738B01D2255/20761B01D2255/502B01D2255/504B01D2255/9022B01D2255/9035
Inventor约瑟夫·费代科扬妮克·比达尔亚历山大·格林马修·哈里斯卢静尼古拉斯·麦克纳马拉
OwnerJOHNSON MATTHEY PLC