초록 ▼

The invention relates to a process for the selective catalytic reduction of the nitrogen oxides contained in a lean exhaust gas from internal combustion engines by reducing the nitrogen oxides by means of ammonia on a catalyst. The process is characterized in that, in addition to the lean exhaust ga

The invention relates to a process for the selective catalytic reduction of the nitrogen oxides contained in a lean exhaust gas from internal combustion engines by reducing the nitrogen oxides by means of ammonia on a catalyst. The process is characterized in that, in addition to the lean exhaust gas, a rich gas stream is produced that is treated in an electrical gas discharge plasma in order to form the ammonia required for the reduction.

대표청구항 ▼

1. A process for the selective catalytic reduction of nitrogen oxides contained in a lean exhaust gas from an internal combustion engine with one or more cylinders, comprising:a) producing a rich gas stream with a normalized air/fuel-ratio of less than 1, b) forming ammonia in the rich gas stream by

1. A process for the selective catalytic reduction of nitrogen oxides contained in a lean exhaust gas from an internal combustion engine with one or more cylinders, comprising:a) producing a rich gas stream with a normalized air/fuel-ratio of less than 1, b) forming ammonia in the rich gas stream by treating the rich exhaust gas stream in an electrical gas discharge plasma generated between two electrodes, c) combining the lean exhaust gas with the rich gas stream, and d) reducing the nitrogen oxides contained in the lean exhaust gas on a reduction catalyst using the ammonia as a reducing agent.