Akademik Veri Yönetim Sistemi
IV. INTERNATIONAL SIIRT CONFERENCE ON SCIENTIFIC RESEARCH, Siirt, Türkiye, 17 - 18 Kasım 2023, ss.891-898
Selective catalytic reduction (SCR) technology is an exhaust after-treatment system used for nitrogen oxide (NOx) emission abatement with the help of reductants and catalysts in diesel engines. The reductant used in this technology is commercially called AdBlue, which is an aqueous urea solution. Also, the V2O5-WO3/TiO2 catalyst is widely used in this system. However, at low exhaust gas temperatures, the NOx conversion productivity of this reductant and catalyst is not at the desired level. For this reason, in conducted studies, the use of hydrocarbons has become more widely preferred to increase the effectiveness of SCR systems in reducing NOx at low temperatures. In addition to hydrocarbons such as ethylene and propylene, oxygen-containing hydrocarbons such as ethanol and butanol can also be used as reductants in the SCR system. Therefore, such systems are called hydrocarbon selective catalytic reduction (HC-SCR). In this experimental study, the catalysts of the system were prepared by the impregnation method. Cordierite (2Al2O3-5SiO2-2MgO), the main carrier structure, was used in the production of catalysts. Besides, TiO2 as the support material, copper (II) nitrate trihydrate (Cu(NO3)2.3H2O) and zinc nitrate hexahydrate (Zn(NO3)2.6H2O) as the source for copper and zinc ions, and finally ammonium dihydrogen phosphate ((NH4)(H2PO4)) as the source for phosphorus were utilized. The performance tests for the SCR catalysts were conducted under controlled conditions to evaluate their efficiency in reducing NOx emissions. The key test conditions included a space velocity (SV) of 40000 h⁻¹, measurements of NOx values at 10 °C intervals within the range of 170-240 °C exhaust gas temperature and the use of ethanol and butanol as reductants. The maximum conversion efficiency, realized utilizing butanol as the reductant, was attained at a temperature of 240 °C employing the P-Zn-Cu-TiO2 catalyst, yielding a remarkable rate of 91.38%.