NOx Reduction in Ag/Al2O3-SiO2 Converters in the Exhaust of a Compression-Ignition Engine

Energies

卷:14

Piotr Orliński¹  Marcin Ślęzak²  StanisławW. Kruczyński² 

[1] Faculty of Automotive and Construction Machinery Engineering, Warsaw University of Technology, Narbutta 84, 02-524 Warsaw, Poland;

[2] Motor Transport Institute, Jagiellonska 80, 03-301 Warsaw, Poland;

关键词: NO_x reduction;    compression-ignition engine;    silver;    engine exhaust after-treatment;   

DOI  :  10.3390/en14010020

来源: DOAJ

【 摘 要 】

NO_x emissions in compression-ignition engines can be reduced, either through the application of engine-internal methods, i.e., making sure that as little NO_x as possible is produced as a result of the mixture combustion processes, or through the use of catalytic converters designed to reduce nitrogen oxides, including NH₃-SCR or HC-SCR converters. Converters using ammonia offer high conversion rates, but they tend to be problematic in terms of their operation. For this reason, converters using hydrocarbons for the purpose of NO_x reduction have been gaining in popularity. An Ag/Al₂O₃-SiO₂ converter is an example of such a catalytic converter. This paper describes the process of preparing such a converter and characterises the porosity and acidity of its surface. The dispersion of silver was assessed based on oxygen absorption tests on crystallites of sliver and based on TEM images of crystallites of silver. The conversion of NO₂, NO and propane was assessed depending on the temperature. Additionally, NO₂, NO and propane conversion was assessed at 500 °C, depending on the admixture of a reducer, and propane selectivity in the process of reduction of NO to N₂ was calculated. The test results indicate that the developed converter can be considered the basis for further research into the development of this compression-ignition engine exhaust after-treatment technology.

【 授权许可】

Unknown