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Title: Reformer assisted lean NO.sub.x catalyst aftertreatment system and method

Abstract

A method and apparatus for catalytically processing a gas stream passing therethrough to reduce the presence of NO.sub.x therein, wherein the apparatus includes a first catalyst composed of a silver-containing alumina that is adapted for catalytically processing the gas stream at a first temperature range, a second catalyst composed of a copper-containing zeolite located downstream from the first catalyst, wherein the second catalyst is adapted for catalytically processing the gas stream at a lower second temperature range relative to the first temperature range, a hydrocarbon compound for injection into the gas stream upstream of the first catalyst to provide a reductant, and a reformer for reforming a portion of the hydrocarbon compound into H.sub.2 and/or oxygenated hydrocarbon for injection into the gas stream upstream of the first catalyst. The second catalyst is adapted to facilitate the reaction of reducing NOx into N.sub.2, whereby the intermediates are produced via the first catalyst reacting with NOx and hydrocarbons.

Inventors:
 [1];  [2];  [3]
  1. Media, PA
  2. Peoria, IL
  3. Havana, IL
Issue Date:
Research Org.:
Caterpillar Inc., Deerfield, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
993143
Patent Number(s):
7743602
Application Number:
11/514,544
Assignee:
ExxonMobil Research And Engineering Co. (Annandale, NJ)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01N - GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Kalyanaraman, Mohan, Park, Paul W, and Ragle, Christie S. Reformer assisted lean NO.sub.x catalyst aftertreatment system and method. United States: N. p., 2010. Web.
Kalyanaraman, Mohan, Park, Paul W, & Ragle, Christie S. Reformer assisted lean NO.sub.x catalyst aftertreatment system and method. United States.
Kalyanaraman, Mohan, Park, Paul W, and Ragle, Christie S. Tue . "Reformer assisted lean NO.sub.x catalyst aftertreatment system and method". United States. https://www.osti.gov/servlets/purl/993143.
@article{osti_993143,
title = {Reformer assisted lean NO.sub.x catalyst aftertreatment system and method},
author = {Kalyanaraman, Mohan and Park, Paul W and Ragle, Christie S},
abstractNote = {A method and apparatus for catalytically processing a gas stream passing therethrough to reduce the presence of NO.sub.x therein, wherein the apparatus includes a first catalyst composed of a silver-containing alumina that is adapted for catalytically processing the gas stream at a first temperature range, a second catalyst composed of a copper-containing zeolite located downstream from the first catalyst, wherein the second catalyst is adapted for catalytically processing the gas stream at a lower second temperature range relative to the first temperature range, a hydrocarbon compound for injection into the gas stream upstream of the first catalyst to provide a reductant, and a reformer for reforming a portion of the hydrocarbon compound into H.sub.2 and/or oxygenated hydrocarbon for injection into the gas stream upstream of the first catalyst. The second catalyst is adapted to facilitate the reaction of reducing NOx into N.sub.2, whereby the intermediates are produced via the first catalyst reacting with NOx and hydrocarbons.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {6}
}

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Works referenced in this record:

Promotion effect of H2 on the low temperature activity of the selective reduction of NO by light hydrocarbons over Ag/Al2O3
journal, May 2003


Kinetic considerations of H2 assisted hydrocarbon selective catalytic reduction of NO over Ag/Al2O3
journal, April 2006