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Title:
AMMONIA OXIDATION CATALYST, EXHAUST GAS PURIFICATION DEVICE USING SAME, AND EXHAUST GAS PURIFICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2012/132678
Kind Code:
A1
Abstract:
Provided are: an ammonia oxidation catalyst having excellent heat resistance and being capable of suppressing N2O and NOx by-production and ammonia leakage, when purifying nitrogen oxides discharged from a boiler etc., by spraying urea water or the like on a selective reduction catalyst; an exhaust gas purification device using same; and an exhaust gas purification method. Same are provided by the ammonia oxidation catalyst (AMOX) or the like for oxidating and removing surplus ammonia when selectively reducing nitrogen oxides by adding urea or ammonia to exhaust gas and using a selective reduction catalyst (SCR), the ammonia oxidation catalyst having at least two catalyst layers covering the surface of an integrally structured carrier, said catalyst layers having: a catalyst layer (lower layer) including a catalyst carrying a precious metal on an inorganic starting material including either a complex oxide (A) having at least titania and silica as the main components thereof or a complex oxide (B) comprising alumina or alumina and silica; and a catalyst layer (upper layer) including a complex oxide (C) comprising at least silica, tungsten oxide, ceria, and zirconia. The composition of the complex oxide (C) is no more than 20 wt% silica, 1-50 wt% tungsten oxide, 1-60 wt% ceria, and 30-90 wt% zirconia.

Inventors:
ITO TOMOAKI (JP)
OKAJIMA TOSHINORI (JP)
HIHARA TAKASHI (JP)
NAGATA MAKOTO (JP)
Application Number:
PCT/JP2012/054518
Publication Date:
October 04, 2012
Filing Date:
February 24, 2012
Export Citation:
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Assignee:
N E CHEMCAT CORP (JP)
ITO TOMOAKI (JP)
OKAJIMA TOSHINORI (JP)
HIHARA TAKASHI (JP)
NAGATA MAKOTO (JP)
International Classes:
B01J29/78; B01D53/86; B01D53/94; B01J23/652; F01N3/08; F01N3/10; F01N3/24; F01N3/28
Domestic Patent References:
WO2010062730A22010-06-03
Foreign References:
JPH07328438A1995-12-19
JP2010115600A2010-05-27
JP2008272659A2008-11-13
JP2004524962A2004-08-19
JPH105591A1998-01-13
JP2005238195A2005-09-08
JP2002502927A2002-01-29
JPH07328438A1995-12-19
JP2008279334A2008-11-20
JP2005185969A2005-07-14
JP2008296107A2008-12-11
JP2005502451A2005-01-27
Other References:
S. VERDIER ET AL.: "Acidic Zirconia Materials for Durable NH3-SCR deNOx Catalysts", SAE TECHNICAL PAPER SERIES, 2008, SAE-2008-01-1022, pages 2, XP008171606
See also references of EP 2692437A4
Attorney, Agent or Firm:
KAWABI Kenji (JP)
Kenji Kawabi (JP)
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Claims:



 
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