Modeling the selective catalytic reduction of NORxR by ammonia over a Vanadia-Titania catalyst from exhaust gases

Nitrogen oxides,NORxR (NO+NOR2R), emitted with exhaust gases during the gases during the combustion of fossil fuels or biofuelsare among the main sources of air pollution.NORxR are contributed to a variety of environmental problems including acid rain, ground level zone (smog) and visibility degradation. Selective catalytic reduction (SCR) of NORxR is one of the most efficient and economic technology for the removal of NORxR by using reducing agents such as CO, HR2R, NHR3R and hydrocarbons. Ammonia was found to be a suitable reductant for NO in the presence of oxygen, because ammonia reacts selectively with NO to produce NR2R.The present study discusses the testing of a mechanistic kinetic model for the SCR of NORxR to describe the kinetics of VR2ROR5R/TiO2 catalysis at atmospheric pressure and a temperature of in a plug flow reactor. A good agreement between experimental and model results has been obtained. A homogeneous model consisting of mass balance equations was solved. The results show that NORxR conversion increases with the increase in the operation temperature. However, NO/NHR3Rdoes not change the NORx Rconversion