Title:
NOX REDUCTION CATALYST FOR EXHAUST GAS AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2012/033039
Kind Code:
A1
Abstract:
[Problem] To provide a catalyst having excellent performance and durability by improving the NOx reduction rate at 350˚C or higher without deteriorating excellent durability of a Ti-V-Mo-P catalyst in view of problems of the prior art.
[Solution] A NOx reduction catalyst for exhaust gas, which is composed of a catalyst composition that comprises titanium (Ti), an oxide of phosphorus (P), molybdenum (Mo) and/or tungsten (W), an oxide of vanadium (V), and high-silica zeolite that has an SiO2/Al2O3 ratio of 20 or more. The NOx reduction catalyst for exhaust gas is obtained by kneading in the presence of water, drying and then firing (1) titanium oxide, and phosphoric acid or an ammonium salt of phosphoric acid in an amount of more than 1 wt% but not more than 15 wt% relative to the titanium oxide in terms of H3PO4, (2) an oxo acid or oxo acid salt of molybdenum (Mo) and/or tungsten (W) and an oxo acid salt or vanadyl salt of vanadium (V) respectively in an amount of more than 0 atom% but not more than 8 atom% relative to the titanium oxide and (3) high-silica zeolite in an amount of more than 0 wt% but not more than 20 wt% relative to the titanium oxide.
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Inventors:
KATO YASUYOSHI (JP)
IKEMOTO SEIJI (JP)
IKEMOTO SEIJI (JP)
Application Number:
PCT/JP2011/070129
Publication Date:
March 15, 2012
Filing Date:
September 05, 2011
Export Citation:
Assignee:
BABCOCK HITACHI KK (JP)
KATO YASUYOSHI (JP)
IKEMOTO SEIJI (JP)
KATO YASUYOSHI (JP)
IKEMOTO SEIJI (JP)
International Classes:
B01J29/26; B01D53/94
Domestic Patent References:
| WO2009031234A1 | 2009-03-12 | |||
| WO2008099814A1 | 2008-08-21 | |||
| WO2011099492A1 | 2011-08-18 |
Foreign References:
| JPH0671187A | 1994-03-15 |
Other References:
See also references of EP 2614886A4
Attorney, Agent or Firm:
KAWAKITA TAKENAGA (JP)
Kawakita Takenaga (JP)
Kawakita Takenaga (JP)
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Claims: