Automobile exhaust gas purifying honeycomb ceramics

Product ID: 270ab2
 
 
 
 
Motor vehicle exhaust gas purifying honeycomb ceramics.jpg

  

Carrier

Coating

Working principle and advantages of the three-way catalytic reactor

Purifying agent

Advantages

Note the three-way catalytic reactor

Channel geometric characteristics

Physical property

Typical product dimension

 

Our company successfully developed a variety of models of automotive catalytic converters, applicable to various types of models currently on the market, and emission standards. We provide customer made products to meet the actual needs of different requirements.
 
Automotive catalytic converters clearance of the three main pollutants can reach 90% of its total (hydrocarbons, CFCs and nitrous oxide). A complete catalyzing reaction depends on the fuel mixture in the smaller air-fuel ratio within the reservation. This air-fuel ratio is only through the normal oxygen sensor system to perform its functions to achieve.
Automotive catalytic converters consist from several parts of the shell, insulation protective cover, the middle segment, entry and exit cone segments, flexible clamping materials, anti-straight-through seal catalyst, in which the technical core of the catalyst acts as automotive catalytic converters, including carrier, two part coating.

Carrier

The basic material of carrier is ceramic (MgO2, Al2O3, SiO2). The purpose of the ceramics is to provide a bearer for catalyst coating inert physical structure. In order to obtain a large catalytic surface in a smaller volume, the surface of the carrier system is made into form of a honeycomb.

Coating

In the carrier surface coating layer, a very loose layer of activity-based metal oxide γ-AL2O3 is applied. Because the surface is very rough, so the actual use area is increased about 7,000 times. This greatly increases the active surface of the automotive catalytic converter and the ability to store oxygen. Outside the active layer, Zr, Ce, Rh, Pd, Pt and other precious metals are coated to improve the catalyst.

Working principle and advantages of the three-way catalytic reactor

Purifying agent

Our catalyst products consist of these three precious metals: palladium, platinum and rhodium. When carbon monoxide, hydrocarbons and nitrogen oxides pass by a three-way catalyst, the activity of the gas at high temperatures is improved. As a result, carbon monoxide is oxidized into carbon dioxide and hydrocarbons into water and carbon dioxide, nitrogen oxides are reduced to nitrogen. Oxidation reaction: HC+O2=H2O+CO2; reduction reaction: Nox+HC+CO=N2+H2O+CO2.

Advantages

Using a cellular ceramic substrate, with a low cost, the active component is strong adhesion, difficult to inactivation and long life; New Rare Earth - zirconium - titanium, increase the heat resistance and activity of the catalyst; transition metals, alkaline earth metal, a small amount of precious metals of active ingredients, with a purification rate, long life, low ignition temperature; new oxygen storage materials, reduces the ignition temperature of the catalyst and transition temperature.

Note the three-way catalytic reactor

  1. Keep the engine in good working condition that is the ideal air-fuel ratio and safe combustion.
  2. Avoid the cold start of the throttle.
  3. The catalyst for the most suitable operating temperature is 400 ° -800 ° C, cannot exceed 1000 ° C, otherwise it will promote the catalyst for prematurely aging and shorten life.
  4. The engine channeling oil to reduce the catalyst activity.

Channel geometric characteristics

No

Channel per square inch

Wall Thickness (mm)

Channel Width  (mm)

Channel area (mm2)

Porosity (%)

Specific surface area (m2/liter)

Specific weight (g/liter)

1

600

0.17

0.87

0.752

70

3.225

580

2

600

0.2

0.84

0.7

65

3.114

580

3

600

0.23

0.81

0.651

61

3.002

580

4

400

0.17

1.1

1.21

75

2.728

480

5

400

0.2

1.07

1.745

71

2.654

480

6

400

0.23

1.04

1.082

67

2.579

480

7

300

0.19

1.28

1.625

74

2.31

500

8

300

0.22

1.25

1.55

70

2.26

500

9

300

0.25

1.22

1.476

67

2.2

500

10

200

0.21

1.58

2.49

77

1.957

435

11

200

0.24

1.55

2.396

74

1.92

435

12

200

0.26

1.53

2.335

72

1.895

435

13

100

0.35

2.18

4.766

74

1.354

465

14

100

0.38

2.15

4.635

72

1.334

465

15

100

0.4

2.13

4.55

71

1.323

465

16

50

0.64

3

9

67

0.672

565

17

50

0.67

2.97

8.821

66

0.659

565

18

50

0.69

2.95

8.703

65

0.65

565

Physical property

Bulk density (g / cm ³)

≤0.70

Water absorption

20-27%

Room temperature compressive strength (KN / cm ²)

 X direction (perpendicular to the channel)

Y direction (parallel to the channel)

 

50-65

160-200

The coefficient of thermal expansion ° C -1 (20-800 ° C)

≤1.50*10-6

0.1Mpa load softening temperature

>1450

Thermal stability (times of air-cool from 800 ° C)

≥3

Specific surface area (cm ² / cm ³)

≥20

Chemical composition

AI2O3

SiO2

MgO

K.Na2O

Fe2O3

Others

31-34%

48-51

12-14%

<1%

<0.5%

<1%

Specific heat (20-100 ° C) J / (KG*K)

800-900

Thermal conductivity (20-100 ° C) W / m.k

1.5-2.5

 Typical product dimension 

Round (mm)

Oval (mm)

Irregualr (mm)

φ150 x100

φ169 X 85.7 x115

144x84x75

φ144 x152.4

φ169 X 80.8x115

114x105x115

φ118 x152.4

φ148 X 84x152.4

120.2x108.2x75

φ115.4 x152.4

φ144.8 X 81.3 x152.4

112.2x92x115

φ106 x100.4

φ127 X 63.5x152.4

119.5x99.5x115

φ103x100

φ93 X 61x90

122.3x104.4x80

φ101.6x152.4

φ120 .6X 80 x152.4

φ100x100

φ143 X 98x152.4

φ93 x152.4

φ147 X 95x152.4

φ83 x152.4

φ177.8 X114.3x170

φ80x100

φ76x50

φ41x25

 

 

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