A Three-Way Catalytic Muffler Using Progressive Air Injection for Automotive Exhaust Gas Purification

Prigent, Michel; Raynal, B.; Courty, P.

doi:10.4271/770298

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“…A great deal of research has been done on the catalytic purification of exhaust gases from internal combustion engines. One of the solutions proposed (Shelef, 1975;Wei, 1975;Hightower, 1975;Montarnal, 1976; Prigent et al, 1977) consists of treating this exhaust through two successive reactors. The first one works with a slightly reducing gas mixture and removes nitrogen oxides by chemical reduction; the unburned products (CO and hydrocarbons) are then catalytically oxidized in the second reactor by means of an intermediate injection of air.…”

Section: Introductionmentioning

confidence: 99%

Exhaust Gas Catalytic Reduction of Nitrogen Oxides over NiFe₂O₄-NiCr₂O₄ Solid Solutions

Courty¹,

Raynal²,

Rebours³

et al. 1980

Ind. Eng. Chem. Prod. Res. Dev.

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This report deals with the catalytic reduction of nitrogen oxides in exhaust gases, over mixed NiFe2_xCrx04 oxides in a bulk state or deposited on a pelletized «-alumina carrier. Initial activity tests (laboratory or motor-bench tests) indicate a better activity and selectivity for the ternary Fe203-Cr203-Ni0 oxide, when compared with the three binary combinations (FeCr, FeNi, and CrNi oxides). The effects of composition variations on catalytic properties of the ternary mixed oxide were studied. The mechanism of aging was investigated for the NiFe2/3Cr3/404 composition by TGA, X-ray diffraction, and activity tests after aging; it was concluded that the aging is probably due to chemical reactions between the «-alumina carrier and the nickel contained in the ternary oxide. This reaction is enhanced when the engine exhaust gases contain the most residual oxygen and can be prevented by adding precious metals to the base oxide formula.

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Section: Introductionmentioning

confidence: 99%

Exhaust Gas Catalytic Reduction of Nitrogen Oxides over NiFe₂O₄-NiCr₂O₄ Solid Solutions

Courty¹,

Raynal²,

Rebours³

et al. 1980

Ind. Eng. Chem. Prod. Res. Dev.

Self Cite

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A Three-Way Catalytic Muffler Using Progressive Air Injection for Automotive Exhaust Gas Purification

Cited by 1 publication

References 7 publications

Exhaust Gas Catalytic Reduction of Nitrogen Oxides over NiFe₂O₄-NiCr₂O₄ Solid Solutions

Exhaust Gas Catalytic Reduction of Nitrogen Oxides over NiFe₂O₄-NiCr₂O₄ Solid Solutions

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A Three-Way Catalytic Muffler Using Progressive Air Injection for Automotive Exhaust Gas Purification

Cited by 1 publication

References 7 publications

Exhaust Gas Catalytic Reduction of Nitrogen Oxides over NiFe2O4-NiCr2O4 Solid Solutions

Exhaust Gas Catalytic Reduction of Nitrogen Oxides over NiFe2O4-NiCr2O4 Solid Solutions

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Exhaust Gas Catalytic Reduction of Nitrogen Oxides over NiFe₂O₄-NiCr₂O₄ Solid Solutions

Exhaust Gas Catalytic Reduction of Nitrogen Oxides over NiFe₂O₄-NiCr₂O₄ Solid Solutions