Abstract
The application of single stone-monolith catalytic substrates to automobile emission control (oxidation of hydrocarbons and carbon monoxide) is discussed, with particular emphasis on physical and chemical properties, affecting catalyst performance and durability. A monolithic substrate coated with a thin layer of active alumina spread uniformly over the geometric surface permits an active metal such as platinum to be nearly monotomically dispersed, thus serving to optimize catalytic efficiency. Laboratory tests indicate that nearly complete conversion of CO and hydrocarbons occurs in time intervals of as little as 10 to 50 milliseconds with monolithic converters. Problems that remain in monolith development include cracking from stresses, internal melting as a result of uncontrolled exotherms, and difficulties arising in the mounting between the monolith and steel container.
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