Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1996-01-24
1998-07-21
Jones, Deborah
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
423212, 4232135, 4232137, 423235, B01D 5358
Patent
active
057831602
ABSTRACT:
The method for purifying combustion exhaust gas according to the present invention utilizes a NH.sub.3 decomposing catalyst. The NH.sub.3 decomposing catalyst in the present invention is capable of converting substantially all of the NH.sub.3 in the combustion exhaust gas to N.sub.2 when the air-fuel ratio of the exhaust gas is lean and the temperature of the catalyst is within a predetermined optimum temperature range. Further, when the exhaust gas contains NO.sub.x in addition to NH.sub.3, the NH.sub.3 decomposing catalyst is capable of reducing the NO.sub.x in the optimum temperature range even though the air-fuel ratio of the exhaust gas is lean. In the present invention, the conditions of the exhaust gas containing NO.sub.x are adjusted before it is fed to the NH.sub.3 decomposing catalyst in such a manner that the temperature of the exhaust gas is within the optimum temperature range and the air-fuel ratio of the exhaust gas is lean. Further, NH.sub.3 is added to the exhaust gas before it is fed to the NH.sub.3 decomposing catalyst. Therefore, a lean air-fuel ratio exhaust gas, at a temperature within the optimum temperature range, which contains both the NO.sub.x and NH.sub.3 is fed to the NH.sub.3 decomposing catalyst, and the NO.sub.x, as well as the NH.sub.3, in the exhaust gas is completely resolved by the NH.sub.3 decomposing catalyst.
REFERENCES:
patent: 3599427 (1971-08-01), Jones et al.
patent: 3825654 (1974-07-01), Kobylinski et al.
patent: 5120695 (1992-06-01), Blumrich et al.
patent: 5292991 (1994-03-01), Lachman et al.
patent: 5409671 (1995-04-01), Takemoto et al.
patent: 5433071 (1995-07-01), Willey et al.
Takiguchi, M. et al., "Catalytic Engine" Nox Reduction of Diesel Engines with New Concept Onboard Ammonia Synthesis System SAE 920469, pp. 613-620. No date available.
Igarashi Kouhei
Itou Takaaki
Kinugasa Yukio
Ohashi Michihiro
Takaoka Toshifumi
Jones Deborah
Toyota Jidosha & Kabushiki Kaisha
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