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Magnesium aluminum silicate structures for DPF applications

A technology of diesel engine and ceramic filter, which is applied in the direction of dispersed particle filtration, membrane filter, application, etc., can solve problems such as difficulty in engine work

Inactive Publication Date: 2005-09-28
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes the engine work harder

Method used

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  • Magnesium aluminum silicate structures for DPF applications
  • Magnesium aluminum silicate structures for DPF applications
  • Magnesium aluminum silicate structures for DPF applications

Examples

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Embodiment Construction

[0041] Table 1 shows the raw materials used to prepare the samples. The comparative (non-invention) samples are shown in Table 2. The samples of the invention are shown in Tables 3 and 4. Table 5 shows a comparison of the pressure drop between the filter prepared according to the method of the present invention and two comparative cordierite DPFs.

[0042] When preparing the sample, weigh the inorganic powder and solid organic binder and lubricant into a Nalgene(R) jar, and mix on a Turbula(R) blender for 20 minutes. Transfer the dry ingredients to a grinder, gradually add liquid organics and water, and grind the mixture to a plastic consistency.

[0043] The ground batch was extruded three times into a hollow flour stick, and then a honeycomb body with a diameter of 1 or 2 inches, 200 holes per square inch, and a wall thickness of 0.019-0.022 inches was formed. For some compositions, it can also be extruded into a 5 / 16 inch rod or 0.020 inch ribbon. A 1-inch diameter honeycomb bo...

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Abstract

A ceramic filter for trapping and combusting diesel exhaust particulates composed of an end-plugged cordierite honeycomb structure exhibiting a pore size distribution as determined by mercury porosimetry in which the quantity d50 / (d50+d90) as related to pore size distribution is less than 0.70, a soot loaded permeability factor Sf, as defined by the equation [d50 / (d50+d90)] / [% porosity / 100], of less than 1.55, and, a coefficient of thermal expansion (25-800° C.) of no greater than 17x10-7 / ° C. The ceramic filter further exhibits a median pore diameter, d50, of at least 4 micrometers and up to 40 micrometers. A method of making the filter is provided.

Description

Invention field [0001] The present invention relates to a magnesium aluminum silicate (MAS) type structure with low thermal expansion and optimal permeability to load soot through the wall for high-temperature filtration applications. In particular, the present invention relates to cordierite wall flow particulate filters having a narrower pore size distribution and greater interconnected porosity than commercially available cordierite wall flow filters. Background of the invention [0002] Due to its high efficiency, durability and economy, diesel engines are of great interest. But in the United States and Europe, diesel engine emissions are under attack because of their harmful effects on the environment and humans. One of the biggest challenges in reducing diesel engine emissions is to control the amount of diesel particulate matter in the exhaust stream of diesel engines that has molecules declared to be toxic air pollutants. [0003] Diesel engine particulate matter is mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/02B01D39/00B01D39/20B01D46/00B01D46/24C04B35/195C04B38/00F01N3/022
CPCC04B2235/5445C04B2235/3206Y10S264/48C04B2235/3218C04B2235/3217Y10S55/10Y02T10/20C04B2235/3222C04B2235/9607B01D46/0001C04B2235/349Y10S55/30C04B2235/3418C04B2235/5463B01D2046/2496C04B38/0006B01D2275/30C04B35/195F01N3/022B01D46/2444C04B2111/00793Y10S55/05B01D2046/2433C04B2235/3445B01D46/2429B01D2046/2437C04B2235/5436C04B2235/6021Y02T10/12B01D46/2498B01D46/24492B01D46/24491B01D46/24494C04B38/0051C04B38/0074C04B38/06C04B38/0054
Inventor D·M·比尔G·A·莫克尔M·J·莫塔格
Owner CORNING INC
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