Abstract:Now a days the global warming and air pollution are big issues in the world. The 70% of air pollution is due to emissions fro m an internal combustion engine. The harmful gases like NOx, CO, unburned HC and particulate matter increases the global warming, s o catalytic convertor plays a vital role in reducing harmful gases, but the presence of catalytic convertor increases the exhau st back pressure, due to this volumetric efficiency will decrease and the fuel consumption is higher. So analysis of catalytic co nvertor is very important. The rare earth metals now used as catalyst to reduce NOX are costly and rarely available. The scarcity and high demand of present catalyst materials necessitate the need for finding out the alternatives. Among all other particula te filter materials, knitted steel wire mesh material is change and selected platinum, palladium and rhodium coated on the surface of ceramic honeycomb structures as filter materials in this paper. Though CFD analysis, various models with different wire mesh shapes rectangular, circular, diamond combinations were simulated using the appropriate boundary conditions. The comparison of back pressure of different catalytic converter model is made in this paper.