Catalyst-carrying honeycomb and process for producing the same
A technology of catalyst and honeycomb body, which is applied in the direction of catalyst carrier, catalyst carrier, catalyst activation/preparation, etc. It can solve the problems of easy accumulation and increased fuel cost, and achieve the effect of excellent heat resistance and easy contact
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no. 1 approach
[0032] A honeycomb structure composed of a ceramic sintered body according to a first embodiment of the present invention will be described with reference to the drawings.
[0033] figure 2 is a perspective view schematically illustrating an example of a catalyst-loaded honeycomb body according to the first embodiment of the present invention, image 3 (a) constitutes figure 2 A perspective view of the honeycomb unit of the catalyst-loaded honeycomb body shown, image 3 (b) is image 3 (a) A cross-sectional view of the honeycomb unit along line A-A.
[0034] also, figure 2 The catalyst-carrying honeycomb body shown is a honeycomb formed by bundling two or more honeycomb units, but the honeycomb structure of this embodiment may also be composed of a single honeycomb unit as described later.
[0035]In the honeycomb structure 45, two or more honeycomb units 50 made of silicon carbide sintered bodies and the like are combined with each other to form a cylindrical ceramic ...
Embodiment 1
[0094] 54.6% by weight of coarse silicon carbide powder with an average particle size of 22 μm, 23.4% by weight of fine silicon carbide powder with an average particle size of 0.5 μm, 4.3% by weight of methyl cellulose as an organic binder, and 2.6% by weight of lubricant (Non Yusha Co., Ltd., Unirub), 1.2% by weight of glycerin, and 13.9% by weight of water were mixed and kneaded to obtain a mixed composition, which was then extruded to produce a molded body. In addition, at this time, the shape of the through-hole of the resulting molded body is used such that image 3 In the mold as shown, the through-holes of the large-volume through-hole group have an octagonal cross-sectional shape perpendicular to the longitudinal direction, and the through-holes of the small-volume through-hole group have a quadrilateral cross-sectional shape perpendicular to the longitudinal direction. In addition, the ratio of the cross-sectional area of the cross section perpendicular to the longi...
Embodiment 2
[0113] Next, a plurality of honeycomb structures (honeycomb units) obtained in Example 1 were bonded with a heat-resistant adhesive material. The heat-resistant adhesive material paste contains 30% by weight of alumina fibers with an average fiber length of 20 μm, 21% by weight of silicon carbide particles with an average particle diameter of 0.6 μm, 15% by weight of silica sol, 5.6% by weight of Carboxymethylcellulose and 28.4% by weight of water. Then, after drying at 120° C., it was cut with a diamond cutter to produce a cylindrical ceramic block with a thickness of 1 mm of the adhesive material layer. Next, a sealing material layer with a thickness of 0.2 mm was formed on the outer periphery of the ceramic block using a sealing material paste (coating paste) containing 23.3% by weight of bismuth having an average fiber length of 100 μm and an average fiber diameter of 10 μm. Silica-alumina fibers, 30.2% by weight of silicon carbide powder having an average particle diamet...
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Abstract
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