| Selective non-catalytic removal of nitric oxide (NO) using powdered cyanuric acid ({dollar}rm Csb3Hsb3Nsb3Osb3{dollar}) and gaseous ammonia (NH{dollar}sb3{dollar}) in separate tests was studied for pressures up to 515 kPa. The experiments were conducted in an electrically heated laminar-flow, variable geometry quartz reactor using mixtures of various concentrations of {dollar}rm Nsb2, Osb2, NO, CO, Hsb2O{dollar} to simulate exhaust gas. A Fourier transform infrared (FTIR) spectrometer was used to detect and quantify the gaseous products of this process.; The effects of mixing, preheating, and/or quenching rate were significant to the reduction processes. The thermal DeNO{dollar}rmsb{lcub}x{rcub}{dollar} process showed the formation of substantial NO{dollar}sb2{dollar} at high-pressure conditions. The cyanuric acid (CA) decomposition results showed tremendous sensitivity to temperature. The RAPRENO{dollar}rmsb{lcub}x{rcub}{dollar} process, which involved CA decomposition at 825 K, had less than 10% of the initial fixed nitrogen species of the simulated combustion stream after mixing with the CA decomposition stream for reactor temperatures above 1300 K at a pressure of 515 kPa. The fixed nitrogen species included NO, {dollar}rm Nsb2O, NOsb2, HNCO, NHsb3{dollar} and HCN. The MULTNO{dollar}rmsb{lcub}x{rcub}{dollar} process (new to this investigation), which involved CA decomposition at 950 K, generally showed little sensitivity to variations in O{dollar}sb2{dollar}, CO, and pressure, but HNCO appeared to be formed during the reduction reaction for reaction temperatures below 1125 K.; The results of this investigation at elevated pressure have not previously been available, and should allow for modifications to existing kinetic models to improve the understanding of these various reduction processes. |
