Modelingthe selective catalytic reduction of NOx by ammonia over a Vanadia-Titania catalyst from exhaust gases

Nitrogen oxides,NOx (NO+NO2), emitted with exhaust gases during the gases during the combustion of fossil fuels or biofuelsare among the main sources of air pollution.NOx are contributed to a variety of environmental problems including acid rain, ground level zone (smog) and visibility degradation. Selective catalytic reduction (SCR) of NOx is one of the most efficient and economic technology for the removal of NOx by using reducing agents such as CO, H2, NH3 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 N2.The present study discusses the testing of a mechanistic kinetic model for the SCR of NOx to describe the kinetics of V2O5/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 NOx conversion increases with the increase in the operation temperature. However, NO/NH3does not change the NOx conversion

کلیدواژه ها:

Selective catalytic reduction (SCR) ، Modeling ، V2O5/TiO2 ، NOx reduction