Ceramic carrier and ceramic catalyst body
A ceramic carrier and catalyst technology, which is applied in the direction of catalyst carrier, physical/chemical process catalyst, ceramic products, etc., can solve the problems of increased heat capacity and increased pressure loss
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Embodiment 1 to 6
[0050] A cordierite material containing talc, kaolin, alumina and aluminum hydroxide, and a compound of an element (Ba, Sr) having a valence different from Si and having NOx absorbing ability substituting 10% of the Si source was used as a raw material. The starting material is roughly mixed in the proportion of the theoretical composition of cordierite, and an appropriate amount of binder, lubricant, wetting agent and water are added to it and mixed into a paste. The paste forms a honeycomb structure with a cell wall thickness of 100 microns, a cell density of 400 cpsi (number of cells per square inch), and a diameter of 50 mm. The honeycomb structure was sintered at 1390° C. for two hours in an air atmosphere, thereby preparing ceramic supports of the present invention (Example 1, 2).
[0051] replace element
a o axis lattice constant
(nano)
The amount of platinum carried
(g / L)
Thermal expansion coefficient
(×10-6 / ℃)
compre...
Embodiment 11 to 14
[0058] A ceramic support was prepared by using a cordierite material including talc, kaolin, alumina, and aluminum hydroxide and substituting W for Al, a constituent element of cordierite. Starting materials were prepared by subtracting 5 to 20% of the Al source from the cordierite material, forming honeycombs similar to the examples described above, and drying. The dry pressed tablet is immersed in the compound WO of W as a substituting element 3 in the solution. Excess WO on the surface of the honeycomb sheet 3 The pellets were removed from the solution and dried. After degreasing at 900°C in air atmosphere, the honeycomb structure was sintered in air atmosphere at a heating rate of 5 to 75°C / hour, and the honeycomb structure was maintained at 1300 to 1390°C.
[0059] The thus-obtained honeycomb structure was immersed in a nitrate and catalyst material (0.07 mol / liter of chloroplatinate and 0.05 mol / liter of rhodium chloride) containing metal elements (Na, Mg, Y, Zr) havi...
Embodiment 17、18
[0064] 10% tungsten oxide (WO) containing talc, kaolin, alumina and aluminum hydroxide, valence different from Si, substituted for 20% of the Si source was mixed approximately in proportion to the theoretical composition of cordierite. 3 ) and 10% cobalt oxide (CoO) cordierite material. Add appropriate amount of binder, lubricant, wetting agent and water to the mixture and mix into a paste. The paste forms a honeycomb structure with a cell wall thickness of 100 microns, a cell density of 400 cpsi (number of cells per square inch), and a diameter of 50 mm. The honeycomb structure was sintered at 1290° C. for two hours in an air atmosphere to obtain the ceramic carrier of the present invention.
[0065] Ions of elements (Ba, K) having NOx absorbing ability are supported on the honeycomb structure produced as described above. Elements with NOx absorbing capacity are deposited using water or alcohol as a solvent. The obtained honeycomb structure immersed in the solution and the...
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Abstract
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