Ceramic catalyst
A ceramic catalyst and catalyst technology, applied in the direction of catalyst carrier, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of pressure loss increase, performance degradation, distance increase, etc., to achieve pressure loss reduction, prevent increase, Effect of preventing pressure loss
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Embodiment 1
[0052] Ceramic bodies were prepared in the following manner to demonstrate the effects of the present invention. First, talc, kaolin, alumina, and aluminum hydroxide were used as raw materials for cordierite, and the raw materials were formulated to approach the theoretical composition of cordierite by substituting W for 5% of the Si source and Co for 5% of the Si source. Then binders, lubricants, humectants and moisture are added to the raw material in an appropriate amount, and then kneaded to form a cell wall thickness of 100 μm, a cell density of 400 cpsi (number of cells per square inch), and a diameter of 50 mm. Honeycomb shape. The formed dense honeycomb body was calcined at 1260° C. in air to obtain a direct-loaded ceramic carrier composed of a cordierite honeycomb structure.
[0053] In order to load the main catalyst component of the precious metal catalyst form on the direct loading type ceramic carrier obtained in the above-mentioned manner, the ceramic carrier is...
Embodiment 2-9
[0064] Ceramic catalyst bodies were prepared in the same manner as in Example 1, except that the types of oxygen storage components used as co-catalyst components were changed, as shown in Table 1, and slurries in which particles of these co-catalyst components were dispersed were used. The thickness of the co-catalyst layer, the amount of the co-catalyst component on the inner surface of the pores, the pressure loss and the purification performance were measured in the same manner as in Example 1. These results are also shown in Table 1.
Embodiment 10
[0066] A ceramic catalyst body was prepared in the same manner as in Example 1, except that for the cocatalyst component ceria / zirconia solid solution particles containing solid-solubilized W therein, a particle containing W's slurry of ceria / zirconia solid solution particles, and make the loading amount 20g / L. The thickness of the co-catalyst layer, the amount of the co-catalyst component on the inner surface of the pores, the pressure loss and the purification performance were measured in the same manner as in Example 1. These results are also shown in Table 1.
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Abstract
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