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Improvement of accuracy of adsorption isotherm measurement in low-pressure region

Research Project

Project/Area Number 19K23574
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0401:Materials engineering, chemical engineering, and related fields
Research InstitutionKyoto University

Principal Investigator

Hiraide Shotaro  京都大学, 工学研究科, 助教 (60853207)

Project Period (FY) 2019-08-30 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords吸着等温線 / 高精度測定 / 真空 / リーク
Outline of Research at the Start

省エネルギーな分離技術として吸着や膜分離が関心を集めているが,その多孔性材料の評価に欠かせないのが吸着等温線測定である。60年代に初めて商用化された吸着測定装置であるが,現在では技術の進歩により,10の-8乗相対圧からの測定を可能とする高性能モデルも登場している。吸着測定装置の普及により,吸着等温線測定の再現性は飛躍的に向上したが,今なお,とりわけ低圧領域において,吸着等温線を精度良く測定することには難しさが存在する。本研究は,測定の外乱となっている系内の圧力上昇の原因を明確にし,それらを排除する方法,および影響を理論的に補正する方法を確立することで,吸着分析の精度向上を目標とする。

Outline of Final Research Achievements

The pressure increase in the low-pressure region, which adversely affects the accuracy of adsorption isotherm measurement, was investigated by combining an adsorption measurement system with a quadrupole mass spectrometer. It was found that nitrogen and oxygen were the dominant causes of the pressure increase in the blank cell, with a small amount of carbon dioxide and water also included. On the other hand, when Y-type zeolites was placed in the sample cell, the pressure increase was caused almost exclusively by nitrogen. In other words, the pressure increase during the adsorption measurement was mainly caused by the leakage of outside air. A program was developed to calculate the true equilibrium pressure by analyzing the partial pressure of the leaked gas from the trend data during the adsorption measurement, and it was shown that the adsorption isotherm in the low-pressure region could be reasonably corrected.

Academic Significance and Societal Importance of the Research Achievements

吸着分子サイズの細孔径を有する多孔体は,吸着分子と強く相互作用するために,低圧環境においても吸着が進行する。裏を返せば,低圧領域における吸着挙動にこそ,その材料の特性が色濃く出るはずであり,本研究で構築した吸着等温線の高精度測定プロトコルによって,より詳細に,かつ再現性よく材料の細孔状態を議論できるようになる。そのため,昨今脚光を浴びている,ターゲットとなる吸着ガスに適した細孔をもつ多孔体を分子レベルで機能設計する研究がより活発となり,吸着や膜分離といった多孔性材料を用いた手法の高効率化,ひいては産業全体におけるエネルギー消費の約半分を占める分離工程の刷新に繋がる成果であると考えている。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2020 2019 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (11 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] High-throughput gas separation by flexible metal-organic frameworks with fast gating and thermal management capabilities2020

    • Author(s)
      Hiraide Shotaro、Sakanaka Yuta、Kajiro Hiroshi、Kawaguchi Shogo、Miyahara Minoru T.、Tanaka Hideki
    • Journal Title

      Nature Communications

      Volume: 11 Issue: 1 Pages: 3867-3867

    • DOI

      10.1038/s41467-020-17625-3

    • NAID

      120006876576

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Efficiency of Thermal Management Using Phase-Change Material for Nonisothermal Adsorption Process2020

    • Author(s)
      Sakanaka Yuta、Hiraide Shotaro、Tanaka Hideki、Hiratsuka Tatsumasa、Kojima Natsuko、Yamane Yasuyuki、Miyahara Minoru T.
    • Journal Title

      Industrial & Engineering Chemistry Research

      Volume: 59 Issue: 32 Pages: 14485-14495

    • DOI

      10.1021/acs.iecr.0c02344

    • NAID

      120006885381

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fast continuous measurement of synchrotron powder diffraction synchronized with controlling gas and vapour pressures at beamline BL02B2 of?SPring-82020

    • Author(s)
      Kawaguchi Shogo、Takemoto Michitaka、Tanaka Hideki、Hiraide Shotaro、Sugimoto Kunihisa、Kubota Yoshiki
    • Journal Title

      Journal of Synchrotron Radiation

      Volume: 27 Issue: 3 Pages: 3692-3699

    • DOI

      10.1107/s1600577520001599

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Time evolution of the framework structure of SBA-15 during the aging process2019

    • Author(s)
      Hiraide Shotaro、Yamada Mitsuhiko、Kataoka Sho、Inagi Yuki、Endo Akira
    • Journal Title

      Colloids and Surfaces A: Physicochemical and Engineering Aspects

      Volume: 583 Pages: 123807-123807

    • DOI

      10.1016/j.colsurfa.2019.123807

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Flexible MOF の成形加工がゲート吸着挙動に与える影響とその熱力学的考察2020

    • Author(s)
      有馬誉,平出翔太郎,宮原稔
    • Organizer
      第71回コロイドおよび界面化学討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 相変化材料による熱管理効果を活用した吸着分離プロセスの構築2020

    • Author(s)
      坂中勇太,平出翔太郎,平塚龍将,田中秀樹,小嶋夏子,山根康之,宮原稔
    • Organizer
      第71回コロイドおよび界面化学討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ソフト多孔性錯体が示すゲート吸着挙動の外力印加に伴う緩慢化の解析2020

    • Author(s)
      有馬誉,平出翔太郎,宮原稔
    • Organizer
      化学工学会 第51回秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 相変化材料による熱補償効果を取り入れた非等温吸着カラムモデルの構築2020

    • Author(s)
      坂中勇太,平出翔太郎,平塚龍将,田中秀樹,小嶋夏子,山根康之,宮原稔
    • Organizer
      化学工学会 第51回秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ソフト多孔性錯体が示すゲート吸着挙動を活かした新規吸着分離プロセスの検討2020

    • Author(s)
      平出翔太郎,坂中勇太,田中秀樹,上代洋,河口彰吾,宮原稔
    • Organizer
      化学工学会 第51回秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] All-silicaゼオライト膜を用いた酸性ガス分離において水分が及ぼす影響の分子論的検討2020

    • Author(s)
      辻川力,平出翔太郎,宮原稔
    • Organizer
      化学工学会 広島大会2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] ゲート型吸着剤を用いた圧力スイング吸着分離システムとその新規操作論の確立2020

    • Author(s)
      山下達之,平出翔太郎,宮原稔
    • Organizer
      化学工学会 広島大会2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] ソフト多孔性錯体の成形加工とゲート吸着挙動の緩慢化2020

    • Author(s)
      平出翔太郎,有馬誉,谷内冬馬,田中秀樹,宮原稔
    • Organizer
      化学工学会第85年会
    • Related Report
      2019 Research-status Report
  • [Presentation] Analysis of equilibrium judgment in low-pressure region toward precise adsorption isotherm measurements2019

    • Author(s)
      Shotaro Hiraide, Marie Shimomura, Masayuki Yoshida, Akira Endo
    • Organizer
      13th international conference on the fundamentals of adsorption (FOA-13)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Identification of disturbances during N2 adsorption measurements at low pressure2019

    • Author(s)
      Shotaro Hiraide, Marie Shimomura, Akira Endo
    • Organizer
      13th international conference on the fundamentals of adsorption (FOA-13)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Flexible MOFを活用したCO2吸着分離プロセスの可能性2019

    • Author(s)
      平出翔太郎
    • Organizer
      第29回吸着シンポジウム
    • Related Report
      2019 Research-status Report
    • Invited
  • [Remarks] 研究室HP

    • URL

      http://www.cheme.kyoto-u.ac.jp/2koza/

    • Related Report
      2020 Annual Research Report 2019 Research-status Report

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Published: 2019-09-03   Modified: 2022-01-27  

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