Catalysts for Diesel Fueled Compression Ignition Engines

4 Catalysts for Diesel Fueled Compression Ignition Engines 

Process type Internal combustion Internal combustion 

Exhaust gas oxygen content lean lean to rich 

Present day diesel engines are in most cases also equipped with an exhaust gas recirculation device (EGR), which causes part of the exhaust gas to be returned to the combustion cylinder. Obviously, the composition and the temperature of the exhaust gas depends upon the design of the engine. 

The exhaust gas of diesel engines has a complex composition as gaseous components are present together with liquid and even with solid components (Table 23). The solid exhaust gas components are denoted particulate matter, and defined as any matter that can be collected on a teflon-coated filter paper from diluted exhaust gas at a temperature below 325 K. Scanning and transmission electron microscopic pictures of such particulates are shown in Fig. 95. 

---