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1996 Fiscal Year Final Research Report Summary

Study on the Simultaneous Catalytic Removal of Diesel Soot Particulates and Nitrogen Oxides

Research Project

Project/Area Number 06559012
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field 広領域
Research InstitutionNagasaki University

Principal Investigator

KAGAWA Shuichi  Faculty of Engineering, Professor, 工学部, 教授 (80037746)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Kiyohide  RIKEN Corporation Technological Reserach Center, General Manager, 研究センター, 次長
TERAOKA Yasutake  Faculty of Engineering, Associate Professor, 工学部, 助教授 (70163904)
Project Period (FY) 1994 – 1996
KeywordsDiesel particulate / Nitrogen oxides / Simultaneous removal / Catalyst / Perovskite-type oxide / Spinel-type oxide
Research Abstract

The present study has aimed to develop a new after-treatment catalytic system for diesel exhausts, socalled the simultaneous removal of NOx and diesel particulates (PM). The catalytic activity of perovskite-type (ABO_3), K_2NiF_4-type (A_2BO_4) and spinel-type (AB_2O_4) oxides for the simultaneous NOx-PM removal depended significantly on A- and B-site metal cations. Generally speaking, mixed metal oxides containing Co and Mn showed high activity but low selectivity to NOx reduction into N_2, while those containing Cu and Fe were excellent catalysts with moderate activity and high selectivity. The addition of alkali metal ions, especially K,was quite effective in promoting both the activity and selectivity. The mixed metal oxides were superior to transition metal simple oxides, their mechanical mixtures and supported Pt catalysts in the selectivity for NOx reduction.
The mechanism of the simultaneous NOx-PM removal reaction was investigated by measuring the effect of gaseous composition … More of NOx and O_2. Nitrogen dioxide (NO_2) was effective for the ignition temperature of PM to decrease, and coexistence of O_2 with NOx was indispensable to enhance the NOx reduction into N_2. Based on the results, a possible reaction mechanism for the simultaneous NOx-PM removal was proposed which involves the oxidation of NO into NO_2 by O_2, the dissociative adsorption of NO_2 to give active oxygen species (O_<ad>), the formation of surface carbon species (intermediate) activated by O_<ad> and the attack of gaseous oxygen to intermediate.
Honeycomb PM filter loaded with perovskite-type La_<0.9>K_<0.1>CoO_3 catalyst (catalytic filter) was prepared as a prototype of practical catalysts. After PM being trapped on the catalytic filter directly from the real diesel exhaust, the simultaneous NOx-PM removal reaction was performed in the flow of simulated diesel exhaust. The result strongly suggests the potentiality in the practical application of the present simultaneous NOx-PM removal process. Less

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Y.Teraoka: "Simultaneous Removal of Nitrogen Oxides and Diesel Soot Particulates Catalyzed by Perovskite-type Oxides" Applied Catalysis,B;Environmental. 5. L181-L185 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 寺岡靖剛: "NOx-ディーゼルパティキュレート同時除去用La-K-Cu-V酸化物の活性相" 触媒. 37. 164-166 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Teraoka: "Simultaneous Catalytic Removal of Nitrogen Oxides and Diesel Soot Paticulate over Perovskite-type Oxides" Environmental Catalysis-for a better World and Life-(Eds.G.Centi et al.). 77-79 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W.F.Shangguan: "Effect of Oxide Composition of Spinel-type Copper Chromites on the Catalytic Activity for the Simultaneous Removal of NOx and Soot Particulate" Reports of the Faculty of Engineering,Nagasaki,University. 25. 241-248 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Teraoka: "Simultaneous Catalytic Removal of Nitrogen Oxides and Diesel Soot Paticulate over Perovskite-type Oxides" Catalysis Today. 27. 107-113 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W.F.Shangguan: "Simultaneous Catalytic Removal of NOx and Diesel Soot Paticulate over Ternary AB_2O_4Spinel-type Oxides" Applied Catalysis,B;Environmental. 8. 217-227 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 寺岡靖剛: "NOxとディーゼルパティキュレートの同時除去反応機構" 触媒. 38. 458-461 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] W.F.Shangguan: "Kinetics of Soot-O_2,Soot-NO and Soot-O_2-NO Reactions over Spinel-type CuFe_2O_4 Catalyst" Applied Catalysis,B;Environmental. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Teraoka: "Simultaneous Removal of Nitrogen Oxides and Diesel Soot Particulates Catalyzed by Perovskite-type Oxides" Applied Catalysis, B ; Environmental. 5. L181-L185 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Teraoka: "Real Active Phase in La-K-Cu-V Mixed Oxide Catalyst for the Simultaneous Removal of NOx and Diesel Soot Particulate (Japanese)" Shokubai (Catalyst). 37. 164-166 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Teraoka: "Simultaneous Catalytic Removal of Nitrogen Oxides and Diesel Soot Particulate over Perovskite-type Oxides" Environmental Catalysis-for a better World and Life-(Eds.G.Centi et al.). 77-79 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W.F.Shangguan: "Effect of Oxide composition of Spinel-type Copper Chromites on the Catalytic Activity for the Simultaneous Removal of NOx and Soot Particulate" Reports of the Faculty of Engineering, Nagasaki University. 25. 241-248 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Teraoka: "Simultaneous Catalytic Removal of Nitrogen Oxides and Diesel Soot Particulate over Perovskite-type Oxides" Catalysis Today. 27. 107-113 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W.F.Shangguan: "Simultaneous Catalytic Removal of NOx and Diesel Soot Particulate over Ternary AB_2O_4 Spinel-type Oxides" Applied Catalysis, B ; Environmental. 8. 217-227 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Teraoka: "Reaction Mechanism of the Simultaneous Removal of NOx and Diesel Particulate (Japanese)" Shokubai (Catalysts & Catalysis). 38. 458-461 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] W.F.Shangguan: "Kinetics of Soot-O_2, Soot-NO and Soot-O_2-NO Reactions over Spinel-type CuFe_2O_4 Catalyst" Applied Catalysis, B ; Environmental. in press.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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