Evaluation of active site of methane oxidation catalyst for marine gas engine exhaust

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15225
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 24020:Marine engineering-related
• Research Institution: National Institute of Maritime, Port and Aviation Technology
• Principal Investigator: Nitta Yoshifuru 国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (50608627)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 触媒 / 排気後処理 / 代替燃料 / メタン / 吸着

Outline of Final Research Achievements

To develop to use of oxidation catalysts to reduce CH4 the exhaust of marine gas engines, this study aims to establish an evaluation method of active site on Pd catalysts under exhaust gas temperature and atmosphere. The applicant developed a method to evaluate the amount of active sites for CH4 oxidation reaction by measuring the volume of CO chemisorbed on the active sites of Pd catalysts, and constructed a dynamic evaluation system of CO adsorption to investigate this experimentally.
By Using this system, the volume of CO adsorbed on Pd catalysts with different Pd loadings was evaluated in the temperature range of 250-450 °C, which is representative of gas engine exhaust. It was found that the CH4 oxidation performance as well as the volume of CO adsorbed at the same temperature were increased with increasing the Pd loading.

Free Research Field

舶用機関

Academic Significance and Societal Importance of the Research Achievements

これまで，排気温度下にある触媒の活性点量を実験的に評価した事例は見当たらない。本研究で開発した動的CO吸着量評価装置は，250-450℃までのガスエンジン排気を代表する温度域にある触媒の活性点量を評価するために，新たに開発したものである。本研究の結果，実排気温度下においてもPd担持量が多いほど，同じ温度における活性点量も多くなることが示された。本手法は，CH4酸化性能の高いPd触媒開発や排気後処理装置に搭載したPd触媒の維持管理のための運用方法開発などに応用する可能性があると考える。