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Characterization of surface functional groups by FT-near infrared spectroscopy

Research Project

Project/Area Number 09490019
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 広領域
Research InstitutionToyohashi University of Technology

Principal Investigator

KAKUTA Noriyoshi  Toyohashi University of Technology, 工学部, 助教授 (30201411)

Co-Investigator(Kenkyū-buntansha) OHKITA Hironobu  Toyohashi University of Technology, 工学部, 教務職員 (20262967)
MIZUSHIMA Takanori  Toyohashi University of Technology, 工学部, 講師 (60239233)
Project Period (FY) 1997 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsNear infrared spectroscopy / OH groups / acid strength / 固体酸 / ゼオライト / シリカアルミナ / 赤外分光法 / 酸強度
Research Abstract

Fourier Transform Near Infrared Spectroscopy (FT-NIR) is a powerful analytical method but is not familiar except for in agricultural fields. The NIR region(4000cm^<-1>〜10000cm^<-1>) covers the overtones and combination of stretching and bending vibrations of O-H bonds. The aim of study is to identify O-H vibrations originated from the acid property, especially on solid acid oxides. As there are a few results on NIR studies, standard samples for the assignment of peaks have been employed using diluents such as CCl_4, C_6H_6 and CHCl_3. The acid strength in the liquid sample is associated to the vibration frequencies of the corresponding OH groups as follows : 1) When the acid strength(pKa) is about 4.5, the vibration frequency of OH groups is observed around 6890Cm^<-1> in CDCl_3 solution. 2) When the acid strength becomes ca. 3, the frequency is shifted to 6850cm^<-1>. 3) When the acid strength is between 4.5 and 3, the absorption peaks appear between 6890Cm^<-1> and 6850cm^<-1> in CDCl_3 solution.
In solid samples, zeolites, where the structures and Si/Al ratios are identified already, show the characteristic peak shoulders at 6500-7000cm^<-1> and 5000cm^<-1>. The positions of peak shoulders are closely correlated with changes in the Si/Al ratio, suggesting that the peak shoulders might be attributed to the OH groups derived from the acid strength. Since the zeolites observed were exposed to air, the peaks from adsorbed H_2O also were detected. In order to identify clearly the peak corresponding to the acid strength, the in-situ and diffuse reflectance techniques are prerequisite. The study is under way.

Report

(5 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] 大北博宣: "リサイクル機能を付加したポリエチレンの開発"工業材料. 48. 20-24 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hironobu OHKITA, Takanori MIZUSHIMA and Noriyoshi KAKUTA: "Development of Polyethylene Installed Recycle Program"Kogyo-zairyo. 48. 20-24 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary

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Published: 1998-04-01   Modified: 2016-04-21  

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