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

Patent ·
OSTI ID:993143
 [1];  [2];  [3]
  1. Media, PA
  2. Peoria, IL
  3. Havana, IL
+ Show Author Affiliations
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.
Research Organization:
Caterpillar Inc. (Peoria, IL)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
Assignee:
ExxonMobil Research And Engineering Co. (Annandale, NJ)
Patent Number(s):
7,743,602
Application Number:
11/514,544
OSTI ID:
993143
Country of Publication:
United States
Language:
English

References (5)

Promotion effect of H2 on the low temperature activity of the selective reduction of NO by light hydrocarbons over Ag/Al2O3 journal May 2003
The effect of hydrogen on the selective catalytic reduction of NO in excess oxygen over Ag/Al2O3 journal August 2004
Combination of low and high temperature catalytic materials to obtain broad temperature coverage for plasma-facilitated NOx reduction journal February 2004
Continuous reduction of NO with octane over a silver/alumina catalyst in oxygen-rich exhaust gases: combined heterogeneous and surface-mediated homogeneous reactions journal October 2003
Kinetic considerations of H2 assisted hydrocarbon selective catalytic reduction of NO over Ag/Al2O3 journal April 2006

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY