| Summary: | NO<sub>x</sub> emissions in compression-ignition engines can be reduced, either through the application of engine-internal methods, i.e., making sure that as little NO<sub>x</sub> 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 NH<sub>3</sub>-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<sub>x</sub> reduction have been gaining in popularity. An Ag/Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> 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 NO<sub>2</sub>, NO and propane was assessed depending on the temperature. Additionally, NO<sub>2</sub>, 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 N<sub>2</sub> 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.
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