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OwnerNoriko Yoshida, Hidehiro Iizuka +3inventors
InventorsNoriko Yoshida, Hidehiro Iizuka, Yasuyoshi Kato, Yoshinori Nagai, Toshiaki Arato
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A porous material having fine holes with controlled diameters and a catalyst having an active ingredient supported in the fine holes in the porous material are used. According to a first embodiment of the invention, the diameter of the plurality of fine holes is within a range of 8 to 9 Å. The fine hole diameter is preferably from 8 to 9 Å when the diameter is measured in a gas adsorption method in which fine holes with diameters of 3.4 to 14 Å can be measured. The fine hole diameter is also preferably from 8 to 9 Å when the fine hole diameter is calculated from a crystal structure. According to a second embodiment of the invention, the porous material is mesoporous silica. The primary particle diameter of the mesoporous silica is preferably within a range of 150 to 300 nm.
A nitrogen oxide removing catalyst for removing a nitrogen oxide from an exhaust gas including the nitrogen oxide and a phosphorous compound, wherein an active ingredient is supported in a fine hole in a material in which a diameter of the fine hole is controlled.
A nitrogen oxide removing catalyst for removing a nitrogen oxide from an exhaust gas including the nitrogen oxide and a phosphorous compound, the catalyst comprising:
A nitrogen oxide removing catalyst for removing a nitrogen oxide from an exhaust gas including the nitrogen oxide and a phosphorous compound, the catalyst comprising:
A nitrogen oxide removing catalyst for removing a nitrogen oxide from an exhaust gas including the nitrogen oxide and a phosphorous compound, wherein a fine hole diameter ratio B/A between a molecule diameter A of the phosphorous compound and an average fine hole diameter of the catalyst or a fine hole diameter B is greater than or equal to 0.78 and smaller than or equal to 1.12, the fine hole diameter being calculated from a crystal structure.
A nitrogen oxide removing catalyst for removing a nitrogen oxide from an exhaust gas including the nitrogen oxide and a phosphorous compound, the nitrogen oxide removing catalyst comprising:
Dependencies are inferred from the claim text.