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NOx ADSORBER CATALYST

一种吸附剂、催化剂的技术，应用在稀燃发动机的排放系统领域，能够解决催化剂储存功能不足等问题

Pending Publication Date: 2019-02-05
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At low temperatures (typically below about 200 °C), the NO x Storage functionality is insufficient and remains an area of ​​catalyst development that needs improvement

Method used

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  • NOx ADSORBER CATALYST
  • NOx ADSORBER CATALYST
  • NOx ADSORBER CATALYST

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0178] Preparation [Al 2 o 3 .Nd(13.0wt%)].Pt.Pd.[Ce.Ba(7%)](10.2mol%Al 2 o 3 .Nd; 8.7mol% Ce.Ba)

[0179] Formation of CeO from barium acetate and high surface area ceria 2 -BaCO 3 The composite was then calcined at 650°C for 1 hour.

[0180] 1.77g / in 3 [Al 2 o 3 .Nd] (prepared according to general preparation (2) above) was slurried with distilled water and ground to a d of 13-15 μm 90 . Then add 94g / ft to the slurry 3 Pt malonate and 19g / ft 3 Pd nitrate solution, and stirred until homogeneous. Make Pt / Pd in ​​[Al 2 o 3 .Nd] on the carrier for 1 hour.

[0181] Then add 3.33g / in to it 3 CeO 2 -BaCO 3 Composite material, then 0.2g / in 3 alumina binder and stir until homogeneous to form a washcoat.

[0182] The washcoat was then applied to the ceramic or metal monolith using standard coating procedures, dried at 100°C and calcined at 500°C for 45 minutes.

[0183] Ba is present at about 4.3 wt% (4.6 mol%). Nd is present at about 0.43 wt% (4.3 mol%).

Embodiment 2

[0185] Preparation [Al 2 o 3 .Nd(0%)].Pt.Pd.[Ce.Ba(7wt%)]

[0186] Prepared as in Example 1, but using Al 2 o 3 Alternative [Al 2 o 3 .Nd].

[0187] Experimental results

[0188] by 10% H 2 O, 20% O 2 and margin N 2 In the composed gas stream, the catalysts of Example 1 and Example 2 were hydrothermally aged at 800° C. for 5 h. They were performance tested in a simulated MVEG-B emissions cycle using a 1.6-liter benchtop diesel engine. Emissions were measured before and after the catalyst. Cumulative NO x Pollutant emissions are shown in figure 1 middle. Engine output (before catalyst) NO x Emissions and NO after catalyst x Difference between emissions indicates NO removal over catalyst x amount. From figure 1 It can be seen that Example 1, which contains the neodymium-containing component, has a greater adsorption of NO than Example 2, which does not contain the neodymium-containing component. x capacity.

Embodiment 3

[0190]Preparation of Al 2 o 3 PtPd[Ce.Ba(7wt%)]

[0191] Formation of CeO from barium acetate and high surface area ceria 2 -BaCO 3 The composite was then calcined at 650°C for 1 hour.

[0192] 1.5g / in 3 Al 2 o 3 Make a slurry with distilled water and grind to a d of 13-15 μm 90 . Then add 94g / ft to the slurry 3 Pt malonate and 19g / ft 3 Pd nitrate solution, and stirred until homogeneous. Make Pt / Pd in ​​Al 2 o 3 Adsorbed on the carrier for 1 hour.

[0193] Then add 3.27g / in CeO to it 2 -BaCO 3 Composite material, then 0.2g / in 3 alumina binder and stir until homogeneous to form a washcoat.

[0194] The washcoat was then coated onto ceramic or metal monoliths using standard procedures, dried at 100°C and calcined at 500°C for 45 minutes.

[0195] Ce is present at a loading of about 59.6 wt% (48.7 mol%). Ba is present at a loading of about 4.6 wt% (4.7 mol%).

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PUM

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Abstract

A NOx adsorber catalyst and its use in an emission treatment system for internal combustion engines, is disclosed. The NOx adsorber catalyst composition comprises a support material, one or more platinum group metals disposed on the support material, and a NOx storage material.

Description

technical field [0001] The present invention relates to NO containing compositions x Sorbent catalysts, compositions comprising neodymium-containing components, methods of making neodymium-containing components, and exhaust systems for lean-burn engines comprising NOx sorbent catalysts. Background technique [0002] Internal combustion engines produce exhaust gases containing a variety of pollutants, including nitrogen oxides (“NO x ”), carbon monoxide and unburned hydrocarbons, which are the subject of government legislation. Increasingly stringent national and regional legislation has reduced the amount of pollutants that can be emitted from such diesel or gasoline engines. Emission control systems are widely used are useful in reducing the amount of these pollutants emitted into the atmosphere, and typically achieve very high efficiencies once they reach their operating temperature (typically, above 200° C.). However, these systems operate below their It is relatively i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94B01J37/02B01J23/10
CPCB01J37/0234B01J37/0248B01D53/9422B01J37/0045B01D2255/1021B01D2255/1023B01D2255/2042B01D2255/91B01J2523/00B01J23/10B01D2255/2047B01D2255/2065B01D2255/2068B01D2255/2092B01D2255/40B01D2255/9022B01D2258/012B01J23/63B01D53/9468B01D2255/1025B01D2255/915B01J35/56B01J2523/25B01J2523/31B01J2523/3712B01J2523/3725B01J2523/824B01J2523/828B01D53/94B01J23/42B01J23/44B01D53/9472B01J20/0203B01J20/06B01J37/0009B01J37/038F01N3/0814F01N2570/14B01D2255/902F01N3/10Y02T10/12B01D2255/903B01J23/005B28B3/20B28B2003/203
Inventor A·P·阿米塔格D·杜兰-马丁P·J·米灵顿P·R·菲利浦斯R·R·拉贾拉姆S·D·瑞德D·斯瓦洛
Owner JOHNSON MATTHEY PLC
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