Effect of cerium oxide nanoparticles on pollutants emission from gasoline engine
纳米氧化铈对汽油发动机尾气污染物排放的影响

Cerium oxide (CeO2) nanoparticles were prepared by nonaqueous microemulsion and were added into 90# gasoline. The effect of CeO2 nanoparticle on engine power performance and the emission of CO, HC, PM, NOx in engine exhausts were evaluated. It was found that the CeO2 powders synthesized within nonaqueous microemulsions had an average particle size of 30~50 nm in narrow size distribution. The addition of CeO2 in gasoline (100 mg/L) did not obviously affect the engine power performance. CeO2 nanoparticles markedly decreased the pollutants emission levels in engine exhausts, especially CO, HC, NOx, PM levels at 800 r/min idle speed was respectively reduced about 19.39%, 19.92%, 51.19% and 25%. For the 2 000 r/min idle speed, the CO, NOx, PM exhaust levels was reduced about 16.17%, 46.92% and 16.67%, respectively.