【Peer-reviewed Papers】

Go to journal home page - Journal of Molecular LiquidsPrediction of ionic liquid solubilities in supercritical CO2 + co-solvent systems using Peng–Robinson equation of state with accurate critical temperatureYuya Hiraga, Ikuo UshikiJournal of Molecular Liquids, 398 (2024)124324
Go to journal home page - Chemical Engineering JournalSynthesis/separation of 5-hydroxymethylfurfural converted from fructose promoted by H2O-CO2 biphasic system with solid catalysts: Experimental and kinetic modeling approachesYuya Hiraga, Kosuke Ebina, Yu Su, Masaru Watanabe, Vincent Oriez, Severine CamyChemical Engineering Journal, 485 (2024)149606
Go to journal home page - Fluid Phase EquilibriaPredictive distribution coefficient (pKD) model for hops extract fractionation in high-pressure CO2 – ethanol – water solvent systemsMasaki Ota, Yusuke Ueno, Masato Urabe, Aruto Kuwahara, Masaru Watanabe, Richard Lee Smith, Hiroshi InomataFluid Phase Equilibria, 569 (2023)113762
多段 2 相分配平衡に基づくクロマトグラフの予測モデルの提案 大田昌樹, 松田修汰, 平賀佑也, 渡邉賢, 猪股宏化学工学論文集, 49 (5), (2023) 129-132
超臨界二酸化炭素を用いたユズ果皮からの天然精油抽出に与える酵素前処理効果の定量評価および抽出残渣の機能性評価平賀佑也, 吉瀬菜南, 鳥居洸太, 戸田雅子, 末吉真由美, 大橋朋貢, 渡邉賢化学工学論文集, 49 (5), (2023) 133-141
Go to journal home page - The Journal of Supercritical FluidsCatalyst-free synthesis of 5-hydroxymethylfurfural from fructose by extractive reaction in supercritical CO2 – subcritical H2O two-phase system Vincent Oriez, Hélène Labauze, Bouchra Benjelloun-Mlayah, Thomas Deleau, Yuya Hiraga, Masaru Watanabe, Jean Stéphane Condoret, Séverine CamyJournal of Supercritical Fluids, 198 (2023)105904
Go to journal home page - Chemical Engineering JournalUnderstanding the reaction behavior of alanine under hydrothermal conditions through a network model Qingxin Zheng, Keisuke Suzuki, Yuya Hiraga, Masaru WatanabeChemical Engineering Journal, 468 (2023)143588-143588
A high-capacity, high-power organic electrode via supercritical CO2 impregnation into activated carbon microporesYuta Nakayasu, Shu Sokabe, Yuya Hiraga, Masaru WatanabeChemical Communications, 21 (2023)3079-3082
Bioresource Technology ReportsIron azaphthalocyanine electrocatalysts for enhancing oxygen reduction reactions under neutral conditions and power density in microbial fuel cellsEdwin Osebe Nyangau, Hiroya Abe, Yuta Nakayasu, Masaki Umetsu, Masaru Watanabe, Chika TadaBioresource Technology Reports, 23 (2023)101565
Go to ACS Sustainable Chemistry & Engineering Excellent Performance of Glycine in Isolating Mn during Hydrothermal Leaching of LiMn2O4 Cathode Materials Qingxin Zheng, Seiya Hirama, Akitoshi Nakajima, Tetsufumi Ogawa, Yuta Nakayasu, Zixian Li, Masaru WatanabeACS Sustainable Chemistry & Engineering, 11, 35 (2023)13033–13042
Go to journal home page - Journal of Bioscience and BioengineeringSemi-wet methanogen cathode composed of oak white charcoal for developing sustainable microbial fuel cellsHiroto Nakano, Yuta Nakayasu, Masaki Umetsu, Chika TadaJournal of Bioscience and Bioengineering, Volume 135, Issue 6 (2023)423-500
Progress on Separation and Hydrothermal Carbonization of Rice Husk Toward Environmental ApplicationsHiroya AbeYuta Nakayasu, Kazutoshi Haga, Masaru Watanabe
Global Challenges, 7, 8 (2023)
Total synthesis and antimicrobial evaluation of (+)-hygrophorone B12 and its analoguesTakaaki Kamishima, Masato Suzuki, Koichi Narita, Yoshitaka Koseki, Toshiyuki Nonaka, Hirotaka Nakatsuji, Hideo Hattori, Hitoshi KasaiScientific Reports, 12, 7471 (2022)
Production of solid fuels by hydrothermal treatment of wastes of biomass, plastic, and biomass/plastic mixtures: A reviewQingxin Zheng, Zixian Li, Masaru WatanabeJournal of Bioresources and Bioproducts, 7, 4 (2022)221-244
Metal Recovery of LiCoO2/LiNiO2 Cathode Materials by Hydrothermal Leaching and Precipitation SeparationAkitoshi Nakajima, Qingxin Zheng, Tetsufumi Ogawa, Seiya Hirama, Masaru WatanabeACS Sustainable Chem. Eng., 10, 38 (2022)12852-12863
Conversion of 2,5-Bis(hydroxymethyl)furan to Highly Oxidized Cyclopentenones under Catalyst-free Conditions in waterHirotaka Nakatsuji, Takaaki Kamishima, Toshiyuki Nonaka, Yoshitaka Koseki, Hitoshi KasaiChemistry Letters, 51, 5 (2022)497-499
Highly crystalline graphite-like carbon from wood via low-temperature catalytic graphitizationYuta Nakayasu, Yasuto Goto, Yuto Katsuyama, Takashi Ito, Masaru WatanabeCarbon Trends, 8, 2022
Bimetallic sulfide ZnMoS4-x/C nanocoral synthesized through glucose-assisted supercritical water system and its high performance for lithium-ion batteriesJi Zhuang, Mengqi Zhang, Bo Li, He Zhu, Xiangyan Zhao, Qingxin Zheng , Ni Xue, Lei Wang, Yang Liu, Xutang TaoElectrochimica Acta, 411, 140075 (2022)
Extraction of calcium phosphate nanoparticles from cooked bone wastes by supercritical waterHuadong Zhang, Chengye Zhang, Qingxin Zheng, Xi ZengWaste and Biomass Valorization, 13 (2022)2287-2294
Advance in low-temperature extraction of natural sources using liquefied dimethyl etherQingxin Zheng, Masaru WatanabeResource Chemicals and Materials, 1 (2022)16-26
Dimethyl carbonate (DMC) synthesis from methanol and carbon dioxide in the presence of ZrO2 solid solutions and yield improvement by applying a natural convection circulation systemQingxin Zheng, Ryo Nishimura, Yoshiyuki Sato, Hiroshi Inomata, Masaki Ota, Masaru Watanabe, Séverine CamyChemical Engineering Journal, 429, 132378 (2022)
Series module of quinone-based organic supercapacitor (> 6 V) with practical cell structure
Yuto Katsuyama, Takayuki Takehi, Shu Sokabe, Mai Tanaka, Mizuki Ishizawa, Hiroya Abe, Masaru Watanabe, Itaru Honma and Yuta Nakayasu
Scientific Reports 12, 3915 (2022)
Rapid, one-step fabrication of MoS2electrocatalysts by hydrothermal electrodepositionYuta Nakayasu, Hiroaki Kobayashi, Shu suke Katahira, Takaaki Tomai, Itaru HonmaElectrochemistry Communications 132 (2022)107180
Single-Step Recovery of Divalent Mn Component from LiMn2O4 Cathode Material at Hydrothermal Conditions as an Mn–Citrate ComplexQingxin Zheng, Kensuke Shibazaki, Tetsufumi Ogawa, and Masaru WatanabeACS Sustainable Chem. Eng. 202110970–1097
Application of hydrothermal leaching technology to spent LIB cathode materials with citric acid using batch-type device and flow systemQingxin Zheng, Kensuke Shibazaki, Tetsufumi Ogawa, Atsushi Kishita, Yuya Hiraga, Masaru WatanabeJournal of Chemical Engineering of Japan 54 (2021)1-7
Sulfonated carbon-catalyzed deamination of alanine under hydrothermal conditionsQingxin Zheng, Takuma Kato, Yuko Ito, Masayoshi Wagatsuma, Yuya Hiraga, Masaru WatanabeThe Journal of Supercritical Fluids 175 (2021)105275
Glycine-assisted hydrothermal leaching of LiCoO2/LiNiO2 cathode materials with high efficiency and negligible acid corrosion employing batch and continuous flow systemQingxin Zheng, Kensuke Shibazaki, Seiya Hirama, Yuta Iwatate, Atsushi Kishita, Yuya Hiraga, Yuta Nakayasu,  Masaru WatanabeACS Sustainable Chemistry & Engineering 9 (2021)3246-3257
Behavior and kinetics of drying, pyrolysis, gasification, and combustion tested by a microfluidized bed reaction analyzer for the staged-gasification processXi Zeng, Jianling Zhang, Mohammed Haruna Adamu, Fang Wang, Zhennan Han, Qingxin Zheng, Lijuan Zhang, and Guangwen XuEnergy & Fuels 34 (2020)2553-2565
Mechanism study on green high-efficiency hydrothermal activation of fly ash and its application prospectLingjun Ma, Yu Feng, Man Zhang, Qingxin Zheng, Bing Wang, Lina Han, Yuping Li, Liping Chang, Weiren Bao, Jiancheng WangJournal of Cleaner Production 275 (2020)122977
Synthesis of unused-wood-derived C-Fe-N catalysts for oxygen reduction reaction by heteroatom doping during hydrothermal carbonisation and subsequent carbonisation in nitrogen atmosphereYasuto GotoYuta Nakayasu, Hiroya Abe, Yuto Katsuyama, Takashi Ito, Masaru WatanabePhilosophical Transactions of the Royal Society A379
Rational route for increasing capacity of hard carbons as sodium-ion battery anodesYuto KatsuyamaYuta Nakayasu, Hiroaki Kobayashi, Yasuto Goto, Itaru Honma, Masaru WatanabeChemSusChem 13 (2020)5762-5768
Supercritical hydrothermal synthesis of MoS2 nanoshets with controllable layer number and phase structureYuki Takahashi, Yuta Nakayasu, Kazuyuki Iwase, Hiroaki Kobayashi, Itaru HonmaDalton Transactions 49 (2020)9377-9384
Hydrothermal leaching of ternary and binary lithium-ion battery cathode materials with citric acid and the kinetic studyQingxin ZhengMasaru Watanabe, Yuta Iwatate, Daiki Azuma. Kensuke Shibazaki, Yuya Hiraga, Atsushi Kishita, Yuta NakayasuThe Journal of Supercritical Fluids 165 (2020)104990
Continuous hydrothermal leaching of LiCoO2 cathode materials by using citric acidQingxin Zheng, Kensuke Shibazaki, Tetsufumi Ogawa, Atsushi Kishita, Yuya Hiraga, Yuta Nakayasu,  Masaru WatanabeReaction Chemistry & Engineering 5 (2020)2148-2154
実リチウムイオン電池廃棄物に対する水熱法を用いた構成金属の有機酸浸出柴﨑 絢祐, 東 大輝, 渡邉 賢, 木下 睦, 平賀 佑也, 宮崎 秀喜化学工学論文集 46(5) (2020)104990
Applied Surface ScienceDefect-Rich Exfoliated MoSe2 Nanosheets by Supercritical Fluid Process as an Attractive Catalyst for Hydrogen Evolution in Water
Quang Duc Truong, Yuta Nakayasu, Quyen T. Nguyen, Duc N. Nguyen, Chuc T. Nguyen, Murukanahally, Kempaiah Devaraju, Dinesh Rangappa, Keiichiro Nayuki, Yoshikazu Sasaki, Phong D. Tra, Takaaki Tomai, Itaru Honma
Applied Surface Science (Accepted) (2020)
CarbonBottom-up synthesis of graphene via hydrothermal cathodic reduction
Takaaki Tomai, Yuta Nakayasu, Yusuke Okamura, Shunichi Ishiguro, Naoki Tamura, Shusuke Katahira, Itaru Honma
Carbon 158 (2020)131 – 136

Resource upgrading in advanced supercritical fluid (supercritical fluid with catalyst and co-solvent): Liquid fuels from biomass in sub and supercritical water & Carbohydrate up-conversion in ionic liquid and supercritical fluids mixtures
Masaru Watanabe, Masayoshi Wagatsuma, Keisuke Suzuki, Takuma Kato, Yasuto Goto, Yukihiro Kanaguri, Yuya HiragaIntech Open
Chemical Engineering Science
A precise deconvolution method to derive methane hydrate cage occupancy ratios using Raman spectroscopy
Yuya Hiraga, Takuya Sasagawa, Shinichiro Yamamoto, Hiroyuki Komatsu, Masaki Ota, Takao Tsukada, Richard L. Smith, Jr.Chemical Engineering Science 214 (2020)115361
クエン酸を用いたコバルト酸リチウムの水熱酸浸出における速度論解析 (2019年度 化学工学会 優秀論文賞)東大輝, 相川達也, 平賀佑也, 渡邉賢.化学工学論文集.  45(4) (2019)147-157
Go to journal home page - The Journal of Supercritical Fluids
Hydrogen gas-free processes for single-step preparation of transition-metal bifunctional catalysts and one-pot γ-valerolactone synthesis in supercritical CO2-ionic liquid systems
Haixin Guo, Yuya Hiraga, Xinhua Qi, Richard L. Smith, Jr.The Journal of Supercritical Fluids, vol. 147 (2019)263-27  
View Articles published in Fluid Phase Equilibria
Methane clathrate hydrate dissociation analyzed with Raman spectroscopy and a thermodynamic mass transfer model considering cage occupancy
Hiroyuki Komatsu, Takuya Sasagawa, Shinichiro Yamamoto, Yuya Hiraga, Masaki Ota, Takao Tsukada, Richard L. Smith, Jr.Fluid Phase Equilibria, 489 (2019)41-47
Go to journal home page - Fluid Phase Equilibria
Measurement and modeling of infinite dilution activity coefficients of organic compounds in an equimolar ionic liquid mixture of [Bmim]Cl and [Bmim][Tf2N]
Shida Tomoka, Hiraga Yuya, Sugiyama Takuya, Sato Yoshiyuki, Watanabe Masaru, Smith Richard L. JrFLUID PHASE EQUILIBRIA 488 (2019)72 – 78

東 大輝, 吉井 孝彰, 渡邉 賢, 平賀 佑也, Smith Jr. Richard L., 尾形 慎, 長田 光正化学工学論文集 45(4) (2019)147-157
Nature Communications
N-formyl-stabilizing quasi-catalytic species afford rapid and selective solvent-free amination of biomass-derived feedstocks
Li Hu, Guo Haixin, Su Yaqiong, Hiraga Yuya, Fang Zhen, Hensen Emiel J. M, Watanabe Masaru, Smith Richard Lee JNATURE COMMUNICATIONS 10(1) (2019)1-13
水熱とイオン液体を軸とした高圧流体による資源変換に関する基礎的検討平賀 佑也, 渡邉 賢高圧力の科学と技術, 29(3), 206-216 (2019)206-216

Rapid synthesis of defective and composition-controlled metal chalcogenide nanosheets by supercritical hydrothermal processing
Yuta Nakayasu, Siobhan Bradley, Hiroaki Kobayashi, Keiichiro Nayuki, Yoshikazu Sasaki, Takaaki Tomai, Thomas Nann, Itaru HonmaNanoscale Advances 1(9) (2019)3383 – 3387

Quinone-based Redox Supercapacitor Using Highly Conductive Hard Carbon Derived from Oak Wood (Front Cover)
Yuto Katsuyama, Yuta Nakayasu, Kotaro Oizumi, Yui Fujihara, Hiroaki Kobayashi, Itaru HonmaAdvanced Sustainable Systems 3 (2019)1900083

【International Conferences】

Metal Recovery of LiCoO2/LiNiO2 cathode Materials by Hydrothermal Leaching and Precipitation SeparationAkitoshi Nakajima9th International Conference on Engineering for Waste and Biomass ValorisationCopenhagen, Denmark

Hydrothermal leaching of commercial and spent lithium-ion battery cathode materials with citric acid employing batch and continuous flow system
Qingxin Zheng, Kensuke Shibazaki, Seiya Hirama, Tetsufumi Ogawa, Akitoshi Nakajima, Yuya Hiraga, Atsushi Kishita, Masaru Watanabe (invited lecture)18th European Meeting on Supercritical fluids (2021)Bordeaux, France

5-Hydroxymethylfurfural production and extraction by solid acid-catalyzed fructose dehydration in supercritical CO2−water two-phase system
Kosuke Ebina, Yuya Hiraga, Hélène Labauze, Séverine Camy, Jean-Stéphane Condoret, Masaru Watanabe18th European Meeting on Supercritical fluids (2021)Bordeaux, France

Rapid fabrication of metallic MoS2 thin film by hydrothermal electrodeposition for electrocatalytic hydrogen evolution reaction
Y. Nakayasu, S. Katahira, H. Kobayashi, I. Honma18th Asian Pacific Confederation of Chemical Engineering CongressSapporo Japan 

High utilization of Anthraquinone as anode active material of organic redox supercapacitor using wood-derived hard carbon. (Best Oral Presentation Award)
Yuto Katsuyama, Yuta Nakayasu, Kotaro Oizumi, Yui Fujihara, Hiroaki Kobayashi, Itaru HonmaThe 3rd ECS Yamagata University Student Chapter SymposiumYamagata, Japan
Titelbild des Flyers
Supercapacitors employing oak-wood-derived porous carbons impregnated with quinones
Yuto Katsuyama, Yuta Nakayasu, Kotaro Oizumi, Yui Fujihara, Hiroaki Kobayashi, Itaru HonmaOrganic Battery Days 2019Jena, Germany

【Domestic Conferences】

押出機を用いた溶融ポリエチレンと高温高圧水との直接混合処理山口大弥、鄭慶新化学工学会 秋季大会2022.9.15
酵素前処理ユズ果皮の超臨界CO2抽出による精油回収及び残渣吉瀬菜南、平賀佑也、渡邉賢化学工学会 秋季大会2022.9.15
超臨界CO2を用いた活性炭細孔内へのキノン類含浸プロセスによる有機電極特性の向上曽我部崇、中安祐太化学工学会 秋季大会2022.9.15

Glycine-assisted hydrothermal leaching of LiCoO2 cathode materials with a continuous flow system (Poster in English)
Seiya HiramaQingxin Zheng, Atsushi Kishita, Yuya Hiraga, Yuta Nakayasu, Masaru WatanabeSCEJ 86th Annual Meeting (2021)Online

後藤泰斗中安祐太, 阿部博弥, 勝山湧斗, 伊藤隆, 渡邉賢化学工学会第86回年会Online

中安祐太 (招待)第10回フラーレン・ナノチューブ・グラフェン若手研究会Online

勝山湧斗中安祐太, 小林弘明, 後藤泰斗, 本間格, 渡邉賢第47回炭素材料学会年会Online

後藤泰斗中安祐太, 阿部博弥, 勝山湧斗, 伊藤隆, 渡邉賢第18回木質炭化学会研究発表会Online

勝山湧斗中安祐太, 小林弘明, 後藤泰斗, 本間格, 渡邉賢第18回木質炭化学会研究発表会Online

中安祐太 (招待)第22回先端研究発表会Miyagi, Japan

蝦名宏祐, 平間聖也, 平賀佑也, 渡邉賢第 22 回先端研究発表会Miyagi, Japan

Phase behavior of ionic liquid with biomass-based molecules and hydrogen in the presence of supercritical CO2 for green biomass refinery
Yuya Hiraga化学系学協会東北大会Yamagata, Japan

超臨界CO2を用いた使用済み活性炭の再生における活性炭加熱操作の影響後藤 泰斗, 佐藤 義之, 猪股 宏第8回 JACI/GSCシンポジウム2019Tokyo, Japan

流通式装置を用いた超臨界二酸化炭素-水間における5-HMFの分配係数測定平間聖也,平賀佑也,渡邉賢第 21 回先端研究発表会Miyagi, Japan

ナラ白炭を担持材として用いた有機キノンレドックスキャパシタ勝山湧斗, 中安祐太, 藤原優衣, 本間格第17回木質炭化学会Tokyo, Japan

固体触媒を用いたイオン液体中でのキチンの加水分解小林拓矢, 吉井孝彰, 平賀佑也, 渡邉賢第 21 回先端研究発表会Miyagi, Japan



後藤泰斗中安祐太, 阿部博弥, 勝山湧斗, 伊藤隆, 渡邉賢第18回木質炭化学会研究発表会Online, Japan


中安祐太, 本間格, 勝山湧斗
中安祐太, 後藤泰斗, 渡邉賢, 伊藤隆

【Other Activities】

東北大学サイエンスカフェにて講演 第167回「超臨界で天然物がお宝に?~新しい食品加工と廃棄物処理技術~」
クリックYamagata, Japan
子供化学実験教室 in 川崎町
Tokyo, Japan