Definition of node. 1a : a pathological swelling or enlargement (as of a rheumatic joint)b : a discrete mass of one kind of tissue enclosed in tissue of a different kind.
Diesel exhaust fluid (DEF) from a separate tank is injected into the exhaust pipeline, where the aqueous urea vaporizes and decomposes to form ammonia and carbon dioxide. Within the SCR catalyst, the NO. x are catalytically reduced by the ammonia (NH. 3) into water ( H2O) and nitrogen (N.
The term âcatalystâ is also frequently used as a synonym for the catalytic converter. Other terms for catalytic converters, which should be generally avoided, include such names as âexhaust purifierâ, âcatalytic purifierâ, âexhaust scrubberâ, or âPTXâ.bstract: Emission control catalysts, introduced in the 1970s, are now used on all types of internal combustion engines, as well as in a number of stationary applications. Catalytic reactors for mobile applications, known as catalytic converters, utilize catalyst-coated monolithic substrates.