08-08-2012, 12:36 PM
Automotive Catalytic Converter
Automotive Catalytic Converter.pptx (Size: 231.44 KB / Downloads: 22)
Introduction
A device in motor vehicles used to convert toxic exhaust fumes to less toxic ones
Incorporated in the exhaust system of the vehicles
Invented in the 1950s by a mechanical engineer name Eugene Houndry
Construction
The converter is made up of three parts
The catalytic core
Support structure for the device
Ca be made from ceramic or metal
The washcoat
which is the catalyst carrier
Disperse the catalyst over a large surface area
Cont..
The catalyst
Most common are platinum, palladium and rhodium which are all precious metals
Copper and iron can sometimes be used
Types on converters
There are two most common types
Three-way converter drives the following reactions simultaneously
2CO + O2 → 2CO2
CxH2x+2 + [(3x+1)/2] O2 → xCO2 + (x+1) H2O (a generalized combustion equation)
Three-way converter drives the following reactions simultaneously
2CO + O2 → 2CO2
CxH2x+2 + [(3x+1)/2] O2 → xCO2 + (x+1) H2O (a generalized combustion equation)
2NOx → xO2 + N2
Disadvantages of the converter
uses expensive metals as catalysts
Converts the toxic chemicals to carbon dioxied as 1 of the procucts, and this is a green house gas.