A new paradigm of mechanism/kinetics of carbon gasification

• Project/Area Number: 17H01340
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Reaction engineering/Process system
• Research Institution: Kyushu University
• Principal Investigator: Hayashi Jun-ichiro 九州大学, 先導物質化学研究所, 教授 (60218576)
• Co-Investigator(Kenkyū-buntansha): 工藤 真二 九州大学, 先導物質化学研究所, 准教授 (70588889)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥44,330,000 (Direct Cost: ¥34,100,000、Indirect Cost: ¥10,230,000); Fiscal Year 2020: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000); Fiscal Year 2019: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000); Fiscal Year 2018: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000); Fiscal Year 2017: ¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
• Keywords: 炭素資源 / ガス化 / 反応機構 / 反応速度論 / 触媒 / アルカリ及びアルカリ土類金属 / バイオマス / 褐炭 / 炭化物ガス化 / カリウム / 触媒活性 / 接触水熱ガス化 / チャー / CO2ガス化 / マイクロ・メソ細孔 / 炭化物 / 速度論 / モデリング / 無触媒反応機構 / カリウム触媒 / 反応速度測定法 / 物質移動 / 炭素 / 反応速度モデリング / 二酸化炭素削減 / 化石資源 / 反応速度 / 無触媒および触媒反応 / 炭素質構造 / 二酸化炭素排出削減

Outline of Final Research Achievements

The rate of steam/CO2 gasification of lignite/biomass-derived char consists of those of non-catalytic gasification and catalytic one. This study has proven experimentally that the non-catalytic gasification obeys first-order kinetics with respect to the amount of gasifying char while the rate constant is steady over the entire range of conversion, independent of changes in char properties. This study has also developed comprehensive kinetic models that describes the rate of gasification catalyzed by inherent or extraneous metallic species over the range of conversion of 0 to 0.999 on the basis of behaviors of metallic species (alkali and alkaline earths) and deactivators such as silica. A new experimental approach developed in this study revealed that many or most of previous studies failed in measuring rates of gasification and rate profiles correctly.

Academic Significance and Societal Importance of the Research Achievements

バイオマスのガス化は次世代の合成ガス製造法として注目される。効率を最高に高めたガス化技術の開発には「反応機構に基づき、包括的かつ高精度の速度論」が欠かせない。本研究は、炭化物のガス化速度を構成する無触媒ガス化および触媒ガス化の双方について、従来明らかとなっていなかったチャーおよび触媒（金属種）の挙動とそれらの速度論との関係を定量的に解明し、今後の研究の新たなプラットホームとなる速度モデルを構築した。加えて、従来の多くの研究においてガス化速度が正しく測定されておらず、ガス化率に対する速度プロファイルは定量的にも定性的にも誤っていることを明らかにし、その問題を解決する方法を提示した。

Research Products

• [Int'l Joint Research] Murdoch University/Curtin University(オーストラリア)
• [Int'l Joint Research] Gadjah Mada University(Indonesia)
• [Journal Article] Sequential conversion of lignite in alkaline water by oxidative degradation, dissolution and catalytic gasification (2020)
  • Author(s): Tianlong Liu, Shusaku Asano, Shinji Kudo, Jun-ichiro Hayashi
  • Journal Title: Fuel Volume: 278 Pages: 118329-118329
  • DOI: 10.1016/j.fuel.2020.118329
  • Peer Reviewed
• [Journal Article] Change in Catalytic Activity of Potassium during CO2 Gasification of Char (2020)
  • Author(s): Nurulhuda Halim, Akira TajimaShusaku, Asano, Shinji Kudo, Jun-ichiro Hayashi
  • Journal Title: Energy & Fuels Volume: 34 Issue: 1 Pages: 225-234
  • DOI: 10.1021/acs.energyfuels.9b03630
  • Peer Reviewed
• [Journal Article] Re-examination of Thermogravimetric Kinetic Analysis of Lignite Char Gasification (2019)
  • Author(s): Shusaku Asano, Cheolyong Choi, Kentaro Ishiyama, Shinji Kudo, Xiangpeng Gao, Jun-ichiro Hayashi
  • Journal Title: Energy & Fuels Volume: 33 Issue: 11 Pages: 10913-10922
  • DOI: 10.1021/acs.energyfuels.9b02946
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Quantitative Description of Catalysis of Inherent Metallic Species in Lignite Char during CO2 Gasification (2019)
  • Author(s): Nurulhuda Halim, U.P.M. Ashik, Xiangpeng Gao, Shinji Kudo, Edy Sanwani, Koyo Norinaga, Jun-ichiro Hayashi
  • Journal Title: Energy & Fuels Volume: 33 Issue: 7 Pages: 5996-6007
  • DOI: 10.1021/acs.energyfuels.9b00465
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Continuous monitoring of char surface activity toward benzene (2019)
  • Author(s): Cheolyong Choi, Kentaro Shima, Shinji Kudo, Koyo Norinaga, Xiangpeng Gao, Jun-ichiro Hayashi
  • Journal Title: Carbon Resources Conversion Volume: 2 Issue: 1 Pages: 43-50
  • DOI: 10.1016/j.crcon.2018.12.001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Effect of SiO2 on loss of catalysis of inherent metallic species in CO2 gasification of coke from lignite (2019)
  • Author(s): Cheolyong Choi,, U.P.M. Ashik, Shinji Kudo, Kazuya Uebo, Koyo Norinaga, Jun-ichiro Hayashi
  • Journal Title: Carbon Resources Conversion Volume: 2 Issue: 1 Pages: 13-22
  • DOI: 10.1016/j.crcon.2018.09.002
  • Peer Reviewed / Open Access
• [Journal Article] CO2 Gasification of Sugar Cane Bagasse: Quantitative Understanding of Kinetics and Catalytic Roles of Inherent Metallic Species (2018)
  • Author(s): Zayda Faizah Zahara, Shinji Kudo, Daniyanto, U.P.M. Ashik, Koyo Norinaga, Arief Budiman, Jun-ichiro Hayashi
  • Journal Title: Energy & Fuels Volume: 32 Issue: 4 Pages: 4255-4268
  • DOI: 10.1021/acs.energyfuels.7b03147
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Kinetics of benzene decomposition over char surface (2019)
  • Author(s): Cheolyong Choi, Kentaro Shima, Shinji Kudo, Koyo Norinaga, Xiangpeng Gao, Jun-ichiro Hayashi
  • Organizer: 化学工学会第84年会
• [Presentation] CO2 Gasification of Sugar Cane Bagasse: Quantitative Understanding of Kinetics and Catalytic Roles of Inherent Metallic Species (2017)
  • Author(s): Zayda Faizah Zahara, Shinji Kudo, Daniyanto, U.P.M. Ashik, Koyo Norinaga, Arief Budiman, Jun-ichiro Hayashi
  • Organizer: 6th Sino-Australian Symposium on Advanced Coal and Biomass Utilisation Technologies
  • Int'l Joint Research / Invited