Development of the Raprenox Process of NOx Control in Diesel Exhausts

The objective was to develop an exhaust treatment process to reduce nitrogen oxide (NOx) emissions in internal combustion engine exhausts. The process uses nontoxic cyanuric acid as a reagent and does not require a catalyst. Experimentation was conducted in a flow tube where the exhaust temperatures and mixing of the reagent can be measured. Of critical interest was the effectiveness of the mixing and the temperatures necessary to reduce NOx efficiently at realistic large diesel engine exhaust flows.