SSANGYONG Y200 Manual page 791

SSANGYONG Y200
ENGINE INTAKE & EXHAUST 1G-3
Catalytic Converter Structure
The Catalytic converter of monolith type consists of 2
walled metal bodies which is made of Cordierite.
The principal element of converter consists of the
materials like Alumina or oxidized Serume in order to
apply to Ceramic Monolith.
Washer coat operates first, and catalytic metal
elements (Pt, Pd, Rh) operates to washer coat next.
Monolith type is lighter than other types, easy to
manufacture and quickly approaches to proper
temperature.
Washer coat is used to make a contact surface with
exhaust gas bigger by adhering closely to small holes
of inner layer.
If a lead compound or phosphorus adheres to the
surface and the temperature rises, its surface is
decreased.
The total area of general monolith converter is about
45,000~500,000ft
Generally Alumina (AL
and its 7 phases of gamma, delta, theta have big areas
and high stability for the temperature, and nowadays
gamma Alumina is used usually.
YAD1G010
Catalytic Converter and Temperature
Catalytic converter has the normal function of
purification at a range of the temperature.
Because it has a weak point of decreasing of the
purification rate in the condition of continuous high
temperature, it should keep the temperature range of
400 to 500°C for normal condition.
HC purification rate becomes better according to the
increase of temperature in the normal range of
temperature.
CO purification rate becomes the best near the
temperature of 450°C, and NO
YAD1G020
temperature of 400 to 500°C.
Purification of Catalytic Converter
•
Adhesion of soluble organic fraction (SOF) below
180°C
•
Purification of soluble organic fraction (SOF) over
180°C
Chemical reaction formula
•
SOF(HC)+O
•
2CO+O
•
2C H
2 6
•
By catalytic action of two primary catalytic
converter, oxidation occurs in order to decrease HC
and CO.
YAD1G030
3 . (10 times of a football field)
O 3 ) is used as a raw material
2
does so near the
x
→
CO +H O
2 2 2
→
2CO
2 2
→
+7O 4CO +6H
2 2 2
0