METHOD FOR PRODUCING EXHAUST GAS PURIFYING FILTER, EXHAUST GAS PURIFYING FILTER, AND EXHAUST GAS PURIFICATION DEVICE
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United States of America Patent
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Jun 14, 2016
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Jul 8, 2015
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Provided is a method for producing an exhaust gas purifying filter that enables a catalyst to be supported on an exhaust gas purifying filter in a simple manner without the need for impregnation with or application of a solution containing catalyst particles after the production of the exhaust gas purifying filter and also enables an exhaust gas purifying filter having a high NOx reduction efficiency to be obtained. The method includes the steps of: extruding a mixture containing zeolite and raw material particles of a support to prepare a green body; firing the green body to prepare a sintered body; treating the sintered foody with alkali under a condition at pH 9.5 or more; and exchanging an element at an ion-exchange site of the zeolite contained in the alkali-treated sintered body with a transition metal.
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