Experimental Study On NSR Characteristics With Dme Steam Reforming Gas As Reducer

DME is excellent altermative fuel for diesel with lower emission, but NOX emissions needs to be reduced. With the advantage of low emission of SCR and high effic iency of lean burn engine, NSR has become one of the most promis ing technologies in the field of NOx catalytic reduction. DME Steam Reforming(SR) can provide high performance reducing agent for NSR. In this thesis, research on the performance of NSR with DME steam reforming gas as reductant is carried out under the support of NSFC(NO. 5117619 and 50976070).Based on the research results of NSR and SR technology, build DME steam catalytic reforming and NSR small kind simulation test bench. SR catalyst CNZ-1/ HZSM-5/Ga2O3 is made by mechanical blending and NSR catalyst Pt/Co-BaO/γ-Al2O3 is made by coprecipitation method. Characterization methods of TPA, TPD, DME-TPSR, H2-TPSR and thermostatic absorption are adopted to study the thermal stability of the stored NOx formation of nitrate in different atmospheres and the performance of the catalytic reduction. Completely absorption-reduction test and absorption-reduction cycle test are finished on the small kind simulation test bench, which provide systematical data about the effect of H2 O and SR catalyst on the performance of NSR, and the influence of experimental conditions(reaction temperature, reduction time and the concentration of reducing agent) and exhaust composition(O2, CO2 and H2O) on the performance of DME-SR-NSR. Research shows that on the combined SR and NSR test bench, NOx conversion rate can increase by 11%; O2 can consume reducing agent, CO2 inhibits NOx adsorption, and water vapor participates in DME reforming, so NOx conversion is changed.Based on above lots of experiments, the feas ibility of elimination of NOx with combined SR and NSR technology in DME engines is analyzed, which lays a solid foundation for the research on low emissions of the DME engine.