Method of reducing NO.sub.x emissions from lean-burn combustion

Details Method of reducing NO.sub.x emissions from lean-burn combustion Method of reducing NO.sub.x emissions from lean-burn combustion

1994-10-31

1997-03-11

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60286, 60301, F01N 320

Patent

active

056090226

ABSTRACT:
The invention includes an operating strategy for zeolite-based catalysts used for reduction of NO.sub.x from highly lean exhaust conditions. The invention includes a method to enhance the high temperature activity of zeolite-based catalysts by modifying the transient feed composition without changing the overall time-average feed composition. More specifically, a cyclic operation method with alternating feed conditions between rich and lean to enhance the activity of zeolite-based catalysts to remove NO from lean exhaust gases when the overall exhaust composition contains a large amount of excess oxygen, without affecting the catalyst's activity to remove hydrocarbons. The rich to lean transient conditions are created by periodically adding hydrocarbon pulses from a different source to the combustion emissions.

REFERENCES:
patent: 5201802 (1993-04-01), Hirota
patent: 5365733 (1994-11-01), Takeshima
patent: 5365734 (1994-11-01), Takeshima
Ward's Engine and Vehicle Technology, vol. 20, No. 13/Jul. 1, 1994; "VW: diesel returns to U.S. in '95", p. 4.
C.J. Bennett et al, "Selective reduction of nitrogen oxides under oxidising exhaust-gas conditions", Applied Catalysis A: General, 86 (1992) L1-L6.
M. Konno et al, "Catalytic Reduction of NOx in Actual Diesel Engine Exhaust", SAE Paper No. 920091.
B.H. Engler et al, "Catalytic Reduction of NOx with Hydrocarbons Under Lean Diesel Exhaust Gas Conditions", SAE Paper No. 930735.

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