C. Catalyst Design Factors
Table 4 summarizes some of the most significant factors that influence to what extent sulfur in the exhaust will influence the performance of the catalytic emission control system. In this section we will discuss each of these in more detail and point out some of the scientific evidence in the literature to explain the mechanisms and processes responsible for this performance deterioration. Furthermore we will discuss some of the approaches used by catalyst designers to reduce the extent of deterioration.