Abstract
Data on the NOx purification performance of copper-based zeolite SCR catalysts installed in vehicles that comply with the 2016 exhaust gas regulations was collected continuously by conducting chassis dynamometer tests and actual road driving tests as the accumulated mileage increased. Using these, the NOx purification rate, space velocity, etc. were used as analytical indices to consider the NOx purification performance of the urea SCR catalyst during the use process. As a result, when the NOx purification performance of the urea SCR catalyst decreases during use, it was found that the NOx purification rate decreased significantly as the space velocity increases.
