成果報告書詳細
管理番号20110000000224
タイトル*平成21年度中間年報 希少金属代替材料開発プロジェクト 排ガス浄化向け白金族使用量低減技術開発及び代替材料開発/ディーゼル排ガス浄化触媒の白金族使用量低減化技術の開発
公開日2011/8/30
報告書年度2009 - 2009
委託先名独立行政法人産業技術総合研究所 三井金属鉱業株式会社 水澤化学工業株式会社 国立大学法人名古屋工業大学 国立大学法人九州大学
プロジェクト番号P08023
部署名ナノテクノロジー・材料技術開発部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 研究開発項目(1)「白金族使用量を低減したディーゼル酸化触媒の開発」 (1)-1 触媒活性種の探索と高度設計 (1)-1-1:最適な触媒活性種組成と構造の探索(産業技術総合研究所) 担体の種類と白金の担持状態の関係を明確にするため、各種市販の担体に白金を含浸担持し担持状態を比較した。その結果、白金分散度は、ZrO2に担持した白金が高くほぼ100%であり、Al2O3、CeO2、CeO2-ZrO2、TiO2の順に低下した。
英文要約Title : Rare Metal Substitute Materials Development Project. Minimization of Platinum Group Metals in Automotive Diesel Exhaust Catalyst. Development of Technology for Reducing PGMs Usage in Automotive Diesel Exhaust Catalyst (FY2009-FY2011) FY2009 Annual Report
(1) Development of diesel oxidation catalyst 1) Screening and design of active species : Catalytic performance of platinum~based catalysts for hydrocarbon combustion was investigated. Among the catalysts tested, Pt/Al2O3 showed the highest catalytic activity and stability toward high temperature ageing. Comparison of the catalytic performance of Pt/Al2O3 with different Pt dispersion suggested that Pt dispersion as well as other factors such as a function of Al2O3 support determines the catalytic activity. 2) Development of catalyst preparation methods : We studied on a novel preparation method for supported binary catalysts using binary metal component nanoparticles, and tried to make metal components be in effective contact with each other. The nanoparticles composed of platinum and cerium could be successfully prepared in an aqueous solution. The nanoparticle size was 2-3nm, and the Ce/Pt molar ratio could be controlled. To improve the thermal stability of Pt/Al2O3 cryogels, the molar ratio of Al(sec-BuO)3, HNO3, and H2O in the sol-gel processing was optimized. The optimized catalyst showed higher activity for CO oxidation than that of a commercial one after heat-treatment at 800C. It was confirmed that some portions of Pt were in ionic states even after the heat-treatment. 3) Advanced design and preparation of support materials : This study aims at the development of catalyst supports having sulfur tolerance, and hierarchical structures with mesopores and macropores preventing the agglomeration of platinum particles and pore blockage by fuel or other mist, respectively. In this year, conventional support materials were screened. Al2O3 was found to be the best as a principal support component. In addition, to examine the influence of geometrical framework of the catalyst support on the overall catalytic performance, models for CFD simulation was constructed. (2) Development of catalyzed diesel particulate filter : PM combustion activity of Ag catalysts was investigated by using various carriers. Ag on basic carriers showed high PM combustion performance after aging. On the other hand, Ag catalysts doped with various transition metals did not show good performance for HC/CO oxidation. To clarify the effective state of Ag catalyst for soot oxidation, Ag supported on various support materials was investigated. Temperature-programmed reduction by NH3 revealed that the active catalysts hold adsorbed oxygen having strong oxidation capacity. (3) Development of catalyst manufacturing technologies and system development : Zone-coated DOC catalyst having different PGM concentrations between front and rear zone was evaluated by light oil combustion test. The zone-coated catalyst showed high performance compared with a normal catalyst. JE05 and NRTC mode tests were enabled by installing evaluation system such as transient mode and emission detector with FT-IR. A commercial DOC+DPF system was evaluated by heavy duty engine bench.
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