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Reduced sulfation impact on cu-scrs

A technology of sulfation and SCR catalyst, applied in molecular sieve catalyst, nitrous oxide capture, chemical instruments and methods, etc., can solve the problem of deactivation of sulfur fuel

Inactive Publication Date: 2019-06-21
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SCR catalysts often contain copper; such Cu-SCR catalysts can provide desirable NO x conversion, but has disadvantages such as deactivation by sulfur fuel

Method used

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  • Reduced sulfation impact on cu-scrs
  • Reduced sulfation impact on cu-scrs
  • Reduced sulfation impact on cu-scrs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] NO MEASUREMENT IN DIFFERENT SYSTEMS x conversion to show the effect of sulfation on different SCR catalysts with and without an upstream oxidation catalyst. The following systems were tested:

[0116] System 1: Cu-SAPO34 SCR catalyst without upstream oxidation catalyst

[0117] System 2: Cu-SAPO34 SCR catalyst with upstream DOC

[0118] System 3: Cu-CHA SCR catalyst without upstream oxidation catalyst

[0119] System 4: Cu-CHA SCR catalyst with upstream DOC

[0120] A Cu-CHA SCR catalyst with 3.3 wt% Cu on CHA-zeolite (SAR22, 10.5 x 6" with 300 / 5 cpsi) was prepared. The loading was at 2 g / in 3 Spray-dried 3.3% Cu on SAR22 CHA (this gives a CuZ loading of 2.09 g / in 3 ). Also 0.3g / in 3 Boehmite alumina was added to the washcoat so that the total washcoat loading was 2.39 g / in 3 .

[0121] A Cu-SAPO-34 SCR catalyst with 2.76 wt% Cu on SAPO-34 zeolite (10.5 x 6" with 300 / 5 cpsi) was prepared. The loading was 2 g / in 3 Spray-dried 2.76% Cu on SAPO-34 (this gives a C...

Embodiment 2

[0125] NO MEASUREMENT IN DIFFERENT SYSTEMS x conversion to show the effect of sulfation on different SCR catalysts with and without an upstream oxidation catalyst. The following systems were tested:

[0126] System 1: Cu-SAPO34 SCR catalyst without upstream oxidation catalyst

[0127] System 2: Cu-SAPO34 SCR catalyst with upstream DOC

[0128] System 3: Cu-CHA SCR catalyst without upstream oxidation catalyst

[0129] System 4: Cu-CHA SCR catalyst with upstream DOC

[0130] A Cu-CHA SCR catalyst with 3.3 wt% Cu on CHA-zeolite (SAR22, 10.5 x 6" with 300 / 5 cpsi) was prepared. The loading was at 2 g / in 3 Spray-dried 3.3% Cu on SAR22 CHA (this gives a CuZ loading of 2.09 g / in 3 ). Also 0.3g / in 3 Boehmite alumina was added to the washcoat so that the total washcoat loading was 2.39 g / in 3 .

[0131] A Cu-SAPO-34 SCR catalyst with 2.76 wt% Cu on SAPO-34 zeolite (10.5 x 6" with 300 / 5 cpsi) was prepared. The loading was 2 g / in 3 Spray-dried 2.76% Cu on SAPO-34 (this gives a C...

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Abstract

Systems and methods related to an exhaust gas purification system comprising: an injector for injecting ammonia or a compound decomposable to ammonia into the exhaust gas, positioned downstream of anengine; a Cu-SCR catalyst positioned downstream of the injector, wherein no oxidation catalysts exist between the Cu-SCR catalyst and the engine; wherein the exhaust gas entering the Cu-SCR catalyst comprises an NH3 / NOx ratio of less than 1.2.

Description

Background technique [0001] Exhaust emissions from diesel engines typically contain at least four categories of pollutants that are legislatively opposed by intergovernmental organizations worldwide: carbon monoxide (CO), unburned hydrocarbons (HC), nitrogen oxides (NO) x ) and particulate matter (PM). A variety of emission control devices exist to treat one or more of each type of pollutant. These emission control devices are often combined as part of the exhaust system to ensure that all four types of pollutants are treated before the exhaust is released to the environment. [0002] Diesel engines are designed to have improved fuel economy. As a result of these designs, diesel engines output higher levels of nitrogen oxides (NO x ), and the exhaust system of such an engine needs to provide higher and higher NO x conversion rate to meet emission regulations. [0003] Selective Catalytic Reduction (SCR) has been proven to be an effective solution to meet the NO x Emissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20B01J37/02F01N13/00
CPCF01N3/208F01N2510/063F01N2610/146F01N13/009B01J29/763B01J29/85F01N3/2066F01N2610/02Y02C20/10Y02T10/12B01D53/9418F01N3/206F01N2610/01F01N2570/145F01N2570/14F01N13/0093B01D53/944B01J37/0246F01N3/035F01N3/0814F01N3/0842F01N3/106B01D2255/20761F01N2370/04F01N2610/1453
Inventor C·史密斯P·玛什A·纽曼
Owner JOHNSON MATTHEY PLC