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Direct observation of catalytic reaction of high temperatures by IR spectroscopy

Research Project

Project/Area Number 11640600
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 物質変換
Research InstitutionTokyo Institute of Technology

Principal Investigator

NOMURA Junko  Tokyo Institute of Technology, Chemical Resources Laboratory Research Associate, 資源化学研究所, 助手 (60234936)

Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsHigh temperature reations / catalyst / IR spectroscopy / FFIR / Solid Surface / Adosorbed Species
Research Abstract

Although IR method has been widely used for the modeling of mechanisms and active sites of catalytic reactions, the limited observation conditions have suppressed the clarification of authentic mechanisms of commercialized high temperature catalytic reactions (HTCR). This study subjects to establish the IR method for the observation of HTCR, and the system is used for the detailed consideration of mechanisms of HTCR, which have been changing.
In 1999, adjustment of IR beam path together with construction of flow system and proper IR cell were established. This system was used from 2000 for the observation of 1) methanol oxidation over molybdenum catalysts supported on various oxides, and 2) isomerization of n-heptane over Pt loaded Hβ zeolites. For the reaction 1), methanol adsorbed forming methoxides on supports and was oxidized to formaldehyde by oxygen flow. No reaction of methoxides proceeded in the absence of molybdenum, indicating that molybdenum is the active site for oxygen activation, which is the rate determining step.
The gasoline refining process, the reaction 2), suffers the cracking side reaction of hydrocarbon isomerization. Based on this background, comparison of highly active and selective catalyst with poorly effective catalyst was considered. From results of both catalytic performance and observation of surface species, Pt loading and hydrogen co-flow were found to be effective to suppress the formation of dehydrated compounds such as coke and polyolefins. Isotope experiments further reveal that hydrogen (H and D) exchange of surface species was rapid on the active catalyst, and that all the active species were in equilibrium in the steady state reaction. In summary, the system established in this study was regarded as a powerful tool for the observation of HTCR, and therefore is further applied for other reactions hereafter.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] S.Yang, J.N.Kondo, K.Donen: "Simultaneous observation of alkenyl carbonium ion and alkoxy species on HZSM-5 Zeolite by adsorption of 1-methylcyclopentene and 1-methylcyclopentanol"J. Pys. Chem. B. 105(33). 7878-7881 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Yang, J.N.Kondo, K.Donen: "Formation of stable alkenyl carbenium ions in high yield by absorption of 1-methylcyclopentene on zeolite Y at low temperature"Chem. Commun.. 2008-2009 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Yang, J.N.Kondo, K.Donen: "Adsorption, migration and reactions of hydrocarbons on zeolites observed by FT-IR spectroscopy"Catalysis. Survey from Japan. 5(2). 139-149 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Yang, J.N.Kondo, K.Donen: "Formation of alkenyl carbenium ions by adsorption of ayclic preausors on zeolite"Catal. Today. 26/27. 1-13 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Yang, J. N. Kondo and K. Domen: "Simultaneous observation of alkenyl carbenium ions and alkoxy species on HZSM-5 zeolite by adsorption of 1-methylcyclopentene and 1-methylcyclopentanol"J. Phys. Chem. B. 105(33). 7878-7881 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Yang, J. N. Kondo and K. Domen: "Formation of stable alkenyl carbenium ions on high yield by adsorption of 1-methylcyclopentene on zeolite Y at low temperatures"Chem. Commun.. 2008-2009 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Yang, J. N. Kondo and K. Domen: "Formation of alkenyl carbenium ions by adsorption of cyclic precursors on zeolite"Catal. Today. 26/27. 1-13 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Yang, J. N. Kondo and K. Domen: "Adsorption, migration and reactions of hydrocarbons on zeolites observed by IR"Catal. Survey Jpn. 5(2). 139-149 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Yang, J.N.Kondo, K.Domen: "Simultaneous Observation of alkenyl carbenium ions and alkoxy Species on HZSM-5 Zeolite by adsorption of 1-methylcyclopentene and 1-methylcyclopentanol"J. Phys. Chem. B. 105(33. 7878-7881 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Yang, J.N.Kondo, K.Domen: "Formation of stable alkenyl carbenium ions in high yield by adsorption of 1-methylcyclopentene on zeolite Y at low temperature"Chem. Commun.. 2008-2009 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Yang, J.N.Kondo, K.Domen: "Adsorption, migration and reditions of hycliocarbons on zectites obserued by FT-IR spectroscopy"Catalysis Survey from Japan. 5(2). 139-149 (2002)

    • Related Report
      2001 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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