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Improvements in emission control

A technology of exhaust system and exhaust manifold, applied in engine control, exhaust device, air quality improvement, etc.

Inactive Publication Date: 2011-02-09
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there has been no need to reduce methane emissions from engines or to increase the catalytic conversion of methane

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0033] figure 1 The methane oxidation activity of a range of palladium, gold and palladium / gold catalysts before and after sulfation is shown. The test gases include carbon monoxide (1000ppm), nitrogen oxide (200ppm), sulfur dioxide (2ppm), methane (900ppm), carbon dioxide (4.5%), water vapor (4.5%), oxygen (8%) and the balance of nitrogen. These results confirm the good activity of the palladium catalyst for methane oxidation (curve A, 2% Pd). In contrast, the gold-only catalyst has poor methane oxidation activity (curve B, 0.5% Au). Surprisingly, the addition of gold to the palladium catalyst significantly enhanced the methane oxidation performance (curve C, 2% Pd + 0.5% Au).

[0034] After sulfation, the palladium catalyst showed a clear loss of activity (curve D, 2% Pd), while the catalyst containing palladium and gold showed a greater loss of activity (curve E, 2% Pd + 0.5% Au). Thus unsulfated palladium / gold catalysts have excellent activity, but perform poorly when s...

Embodiment 2

[0036] This example shows that palladium / gold catalysts can be desulfurized and reactivated for oxidation reactions at much lower temperatures than palladium-only catalysts, and this is also the same as that present on engines fueled by natural gas The turbocharger is carried out at a lower temperature than those preceding it, so the desulfurization carried out there is continuously effective, thus maintaining a high catalytic performance. Catalysts were prepared and tested as described above. Test gases include carbon monoxide (1000ppm), nitrogen oxides (200ppm), sulfur dioxide (2ppm), propylene, (900ppm as C 1 ), carbon dioxide (4.5%), water vapor (4.5%), oxygen (12%) and the balance of nitrogen. The test results obtained are given in Table 1 in the form of achieving 80% conversion of carbon monoxide (CO T80 ) and 50% hydrocarbon conversion (HC T50 ) required temperature.

[0037] Table 1. Test results for unsulfated, sulfated and sulfated catalysts after treatment at 50...

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Abstract

A lean-burn natural gas-fuelled diesel engine comprising an exhaust system comprising an oxidation catalyst. The engine can be used in a mobile application, e.g. to power a vehicle, or it can be a stationary engine for power generation.

Description

technical field [0001] The present invention relates to improvements in emission control. More specifically, the present invention relates inter alia to natural gas fueled internal combustion engines equipped with catalytic emission control systems, typically used in vehicular applications, but which may also be used to treat emissions from stationary engines used for power generation. Background technique [0002] In this description and claims the term "diesel engine" will be used to denote a compression ignition internal combustion engine. [0003] There is a trend toward the use of compressed natural gas in heavy-duty diesel engines, at least in part due to the perception that such engines are "cleaner" in terms of exhaust emissions than engines fueled by liquid diesel. The invention can be applied to both new construction engines and diesel engines that have been modified to run on natural gas instead of liquid diesel fuel. Normally natural gas can be stored as compre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/08F02D19/10F01N3/28F02B37/00
CPCF02D19/10F01N3/2803Y02T10/36F02B37/00Y02T10/144F01N3/08Y02A50/20Y02T10/12Y02T10/30F01N3/28
Inventor A·D·努恩M·V·崔格
Owner JOHNSON MATTHEY PLC
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