Ceramic catalyst carrier
A ceramic catalyst, catalyst technology, applied in catalyst carrier, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of reduced opening area, large thermal expansion coefficient, low mechanical strength, etc., to achieve improved catalyst performance, effective The effect of catalyst performance
Inactive Publication Date: 2003-03-05
DENSO CORP
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Problems solved by technology
However, the effectiveness of this attempt is reduced by the formation of a coating
There is also a problem that the coefficient of thermal expansion of the carrier becomes larger due to the formation of the coating layer, and the reduction of the open area of the cells increases the pressure loss
However, this method has not been practical, because acid treatment or heat treatment leads to the destruction of the cordierite lattice, resulting in lower mechanical strength
Method used
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[0026] Description of the preferred embodiment
[0027] The present invention will now be described in detail below. The ceramic carrier used in the present invention has a configuration such that the catalyst component is directly supported on the surface of the substrate ceramic without forming a coating layer made of γ-alumina. The theoretical composition is 2Mg.2Al 2 o 3 .5SiO 2 The substrate ceramic prepared with cyanite as the main component is suitable as a substrate for ceramics. In addition to cyanite, the main component of the ceramics can also be other ceramic materials such as alumina, spinel, aluminum titanate, silicon carbide, mullite, silica-alumina, zeolites, silicon nitride and zirconium phosphate . The structure of the ceramic body is not particularly limited, and may also be in other shapes such as honeycomb, foam, hollow fiber, fiber, powder or granular.
[0028] One or more elements constituting the substrate ceramics are substituted by elements othe...
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The present invention relates to a ceramic catalyst body having more excellent catalytic performance using a ceramic carrier capable of directly supporting the catalyst component. A ceramic catalyst body is obtained by directly supporting a noble metal catalyst such as Pt on a ceramic carrier made by substituting at least one kind among the constituent elements of cordierite that constitutes the substrate ceramic, for example Al, with W, a compound containing no chlorine, for example dinitrodiammine platinum, is used as a starting material of the noble metal catalyst. It is then possible to prevent the residual chlorine from suppressing support of the catalyst, thereby increasing the quantity of the catalyst supported and to improve the catalyst performance.
Description
field of invention [0001] The present invention relates to a ceramic catalyst body used as a catalyst carrier in an exhaust gas purification catalyst of an automobile engine or the like. Background technique [0002] A catalyst prepared by coating γ-alumina on the surface of cordierite formed into a honeycomb shape and having a noble metal supported thereon is widely used as a catalyst support in exhaust gas purification catalysts. The coating is formed because the specific surface area of cordierite is too small to support the required amount of catalyst components. Thus, the specific surface area of the support is increased by using γ-alumina having a large specific surface area. [0003] However, when the surface of the cell walls of the carrier is coated with γ-alumina, the heat capacity of the carrier increases due to the increase in mass. In order to achieve catalyst activation more easily, research has recently been conducted on a method of reducing the heat cap...
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Patent Timeline
Login to View More IPC IPC(8): F01N3/10B01D53/86B01J23/40B01J23/42B01J23/652B01J35/04B01J35/10B01J37/00B01J37/02F01N3/28
CPCB01J37/0009B01J37/02B01J35/04B01J23/40B01J23/6527B01J35/56
Inventor 田中政一近藤寿治近藤高史长谷智实
Owner DENSO CORP