NITRATE NITROGEN DECOMPOSITION CATALYST

• Main Authors: HIRAI TOSHIHARU, MURAGUCHI MAKOTO, KUMAZAWA MITSUAKI
• Format: Patent
• Language: English; Japanese
• Published: 11.10.2021
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

To provide a ling-life nitrate nitrogen decomposition catalyst that is difficult to be affected by reducing agent.SOLUTION: A nitrate nitrogen decomposition catalyst of the present invention is constituted in such a way that a metal particle having an average particle diameter of 1 to 30nm are carried by active carbon having an average particle diameter of 40 to 200 μm, a pore volume of 0.4 to 1.0 mL/g, and a specific surface area of 800 to 1500 m2/g. Herein, the metal particle includes Cu- Pd alloy, and the carried amount of the metal particle is 0.1 to 3%. Then, it is preferable that the packing density of active carbon is in the range of 0.4 to 0.8 g/mL. Further, it is preferable that the sum of Cu component and Pd component included in the metal particle is 95 mass% or more, and the ratio of Pd component to the sum of Cu component and Pd component is in the range of 60 to 98%.SELECTED DRAWING: None 【課題】 還元剤の影響を受け難い、寿命の長い硝酸性窒素分解触媒を提供する。【解決手段】 本発明の硝酸性窒素分解触媒は、平均粒子径が４０〜２００μｍ、細孔容積が０．４〜１．０ｍＬ／ｇ、比表面積が８００〜１５００ｍ２／ｇの活性炭に、平均粒子径１〜３０ｎｍの金属粒子が担持された構成である。ここで、金属粒子はＣｕ−Ｐｄ合金を含み、その担持量が０．１〜３％である。また、活性炭の充填密度は０．４〜０．８ｇ／ｍＬの範囲が好ましい。また、金属粒子に含まれるＣｕ成分とＰｄ成分の和は９５質量％以上で、Ｃｕ成分とＰｄ成分の和に対するＰｄ成分の割合は６０〜９８％の範囲が好ましい。【選択図】なし