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Catalytic converter with improved start-up behaviour

A catalytic device and catalyst technology, applied in the direction of silencer, exhaust device, catalyst activation/preparation, etc., can solve the problems of low aging resistance, poor conversion, etc., and achieve the effect of improving aging stability

Active Publication Date: 2009-03-25
UMICORE AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After heating the phase, the reduced amount of catalyst material leads to a worse conversion of harmful substances in the exhaust gas
Moreover, this catalytic device has low aging resistance due to the small amount of catalyst material

Method used

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  • Catalytic converter with improved start-up behaviour
  • Catalytic converter with improved start-up behaviour
  • Catalytic converter with improved start-up behaviour

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: comparative catalytic device (catalytic device A):

[0046] Cylindrical metal honeycomb body consisting of 0.05 mm thick unperforated metal foil, 90 mm diameter, 74.5 mm length and 200 cm cell density -2 , coated with a conventional three-phase catalyst comprising platinum, palladium and rhodium with a concentration of noble metal of 1.55 g / l of honeycomb volume.

Embodiment 2

[0047] Embodiment 2: comparative catalytic device (catalytic device B):

[0048] For comparative catalytic device characteristics, a further supported metal catalytic device was fabricated having the same dimensions, foil thickness and same cell density as the comparative catalytic device. However, instead of an unperforated metal foil, an expanded metal was used, which had an elongation of 30%, a grid length of 0.6, a grid width of 0.5, and a strand width of 0.18 mm. The metal support was coated with the same three-phase catalyst at the same concentration as the comparative catalytic device.

[0049] Figure 6a) shows a picture of the structure of the expanded metal used before catalyst coating. Figure 6b) shows the corresponding picture after catalyst coating. It can be clearly seen that the mesh pores of the expanded metal have been completely filled with catalyst material. The catalyst material bonded to the expanded metal in a prominent manner and did not break away e...

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Abstract

In known automobile exhaust gas catalytic converters comprising a metallic honeycomb body consisting of corrugated and smooth sheet metal layers, the thermal capacity and thermal conductivity of said body is reduced by perforations in the sheet metal layers. This permits a more rapid heating of the honeycomb body and the catalytic coating that is applied to the honeycomb body reaches its operating temperature more quickly. One disadvantage of this is the reduction of the support surface as a result of the perforations in the sheet metal layers. According to the invention, the perforations can be permanently filled with the catalytic substance by the appropriate adaptation of the characteristics of the coating suspension used for the catalytic coating to the dimensions of the perforations. The resultant catalytic converter has a significantly reduced thermal capacity and thermal conductivity, whilst retaining the same coating concentration as a catalytic converter with unperforated sheet metal layers.

Description

technical field [0001] The invention relates to a metal honeycomb body as a carrier for a coating of a catalyst material for the exhaust gas cleaning of internal combustion engines. Background technique [0002] What is desired for the honeycomb body is firstly a large geometrical surface area to accommodate the coating and secondly a low heat capacity so that the honeycomb body heats up rapidly to the operating temperature of the catalytic device. In addition, sufficient mechanical stability is required for the honeycomb body to withstand the mechanical stress of the pulsating air flow as well as the vibrations of the engine and the vehicle. Furthermore, the material of the honeycomb must resist the corrosive exhaust gas environment at high temperature. [0003] The catalyst coating of the final catalytic device comprises finely divided thermally stable metal oxides on whose surface catalytically active platinum group metals are deposited. Suitable metal oxides are, for e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28
CPCB01J35/04B01D46/2466B01D46/2418F01N3/281B01D53/9454B01D46/2451B01D2046/2492B01J37/0225B01D2046/2481Y02T10/22Y02A50/20Y02T10/12B01D46/249B01D46/2486B01J35/57F01N3/28F01N3/24B01D46/2484B01D46/247B01D46/2496B01J35/56
Inventor J·奎尔
Owner UMICORE AG & CO KG