Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ammonia scr catalyst and method of using the catalyst

A catalyst, ammonia source technology, applied in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve public health problems and other issues

Active Publication Date: 2012-07-25
CATALYTIC SOLUTIONS INC
View PDF18 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the high temperature present in the DPF during the combustion of carbon particles can gasify the vanadium catalyst on the DPF, which may cause public health problems

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
  • Ammonia scr catalyst and method of using the catalyst
  • Ammonia scr catalyst and method of using the catalyst
  • Ammonia scr catalyst and method of using the catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] Synergy between manganese first component and cerium second component

[0149] Catalysts with the compositions shown in Table 1 were prepared and tested for ammonia SCR reduction of nitrogen oxides. The weight percents of manganese and cerium are given on an oxide and metal basis, respectively, with metal-based weight percents placed in parentheses in the table.

[0150] Table 1

[0151] Composition of Mn and Ce catalysts

[0152]

[0153] Zeolite and OSM were placed on the substrate as an eluting coating at a loading of about 150 g / L. The eluate coating was dried at room temperature and then calcined at 550 °C for 4 hours. The aqueous solutions of manganese nitrate and cerium nitrate are combined and dipped into the stripped coating on the substrate. The catalyst was dried and calcined at 550 °C for 2 hours. The OSM contains the formula Ce 0.24 Zr 0.66 La 0.04 Y 0.06 o 2 CZLY, and the zeolite consists of ZSM-5.

[0154] The catalysts in Table 1 were teste...

Embodiment 2

[0161] NO and NO / N0 2 Effect of Feed Gas on the Activity of Iron β-SCR

[0162] Iron-exchanged zeolite beta was supplied by Tricat GmbH, Bitterfeld, Germany. Catalyst 4 having the composition shown in Table 2 was prepared from iron-exchanged Beta zeolite.

[0163] Table 2

[0164] Composition of iron-exchanged β catalyst

[0165] Catalyst No.

wt% iron exchanged beta zeolite

wt % OSM

4

50

50

[0166] Catalyst 4 was tested with two different feed gases as fresh catalyst and after hydrothermal aging. The first feed gas contains 350ppm NO, no NO 2 . The second feed gas contains 175ppm NO and 175ppm NO 2 mixture. NO / NO of two feed gases x The graph of conversion rate versus temperature is shown in figure 2 shown.

[0167] Mixed NO / NO 2 For feed gas or feed gas containing only NO, hydrothermal aging has little effect on the activity of Catalyst 4.

[0168] Activity of fresh and hydrothermally aged Catalyst 4 for NO containing bu...

Embodiment 3

[0170] NO and NO / N0 2 Effect of Feed Gas on Activity of Mn / Ce / Zeolite / OSM Catalyst

[0171] In Example 3, with NO and NO / NO 2 The feed stream was tested for SCR activity of Catalyst 3, which is a Mn / Ce / Zeolite / OSM catalyst, a catalyst according to an embodiment of the present invention. The catalyst was tested as fresh catalyst and after hydrothermal aging. The result is as image 3 as shown.

[0172] Fresh and hydrothermally aged catalyst 3 for mixed NO / NO 2 Feed gas NO x The transforming activities were essentially the same.

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

No PUM Login to View More

Abstract

A DPF with an SCR catalyst and a method for selectively reducing nitrogen oxides with ammonia, filtering particulates, and reducing the ignition temperature of soot on a DPF are provided. The catalyst includes a first component of copper, chromium, cobalt, nickel, manganese, iron, niobium, or mixtures thereof, a second component of cerium, a lanthanide, a mixture of lanthanides, or mixtures thereof, and a component characterized by increased surface acidity. The catalyst may also include strontium as an additional second component. The catalyst selectively reduces nitrogen oxides to nitrogen with ammonia and oxidizes soot at low temperatures. The catalyst has high hydrothermal stability.

Description

[0001] cross reference [0002] This application is a continuation-in-part of, and claims priority from, Application No. 12 / 313,501, filed November 20, 2008; application No. 12 / 313,501 itself is a continuation-in-part of Application No. 11 / 651,290, filed January 9, 2007 and The contents of both applications, including any references cited therein, are hereby incorporated by reference as a continuation of issued US Patent No. 7,527,776. technical field [0003] The present invention relates to apparatus and methods for simultaneous selective catalytic reduction of nitrogen oxides with ammonia and oxidation / removal of soot from lean burn fuel exhaust. Background technique [0004] Diesel engines typically operate at a higher than stoichiometric air-to-fuel ratio. Nitrogen oxide and particulate emissions from diesel fueled vehicles can be substantial. Emissions from diesel vehicles are also subject to regulations in the United States and Europe. [0005] Both the United Stat...

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 & Authority Applications(China)
IPC IPC(8): B01D53/56B01J23/10B01J29/06
CPCB01J29/076B01D2251/2062B01D2255/504B01J29/7815B01J29/061B01D2255/2066B01D2255/2073B01D2255/204B01D53/9418B01D2255/9155B01D2255/2065B01J37/0246B01D2255/2063B01D2255/50B01D2255/20746B01D2255/20753B01D2255/407B01D2255/20738B01J29/48B01J23/34B01J37/0242B01D2255/20761
Inventor 斯蒂芬.J.戈尔登斯维特拉纳.艾尔特斯卡亚
Owner CATALYTIC SOLUTIONS INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com