研究者詳細 - 則永　行庸

論文 - 則永　行庸

分割表示 216 件中 1 - 20 件目／全件表示 >>

Mechanism investigation of direct electrochemical reduction of CO<inf>2</inf>-loaded 2-(ethylamino)ethanol solution into CO 査読有り

Dai R., Zhang L., Viet Bao Tran K., Sirisomboonchai S., Machida H., Norinaga K.

Separation and Purification Technology 355 巻 2025年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Separation and Purification Technology

Carbon capture and utilization (CCU) has attracted considerable interest recently as CO2 emission and global warming have greatly affected various aspects of the environment, economy, and society. However, energy consumption during CCU must be substantially reduced. In this study, we propose an alternative approach using electrochemical reduction to directly convert CO2-loaded amine solutions into CO. The effects of the electrodes, temperature, potential, and CO2 loading on the Faradaic efficiency (FE) of CO were comprehensively investigated. The Ag NPs/CP electrode showed good catalytic performance on the electrochemical reduction of CO2-loaded amine solution to CO. By comparing the chemical composition in the solution before and after the electrochemical reaction, we determined that the main source of CO might be free CO2, which is mainly converted from bicarbonate rather than carbamate. In addition, electrochemical impedance spectroscopy was used to investigate the resistance during the reaction. The electric double-layer was found over the electrode surface when different amine solutions were used as the electrolyte. The spatial structure of ammonium cations and carbamate plays a key role in the FE of CO in this process.

DOI： 10.1016/j.seppur.2024.129575

Scopus

P-4-5　CO2昇華槽内での伝熱現象における解析条件の検討査読有り

山口博泰, 上原友輔, 町田洋, 則永行庸, 齋藤泰洋

日本エネルギー学会大会講演要旨集 33 巻 ( 0 ) 頁： 244 - 245 2024年7月

6-2-4　窒素ドープ型バイオチャーに高分散したニッケル触媒による高効率CO2電解還元査読有り

Park Gi-Dong, Suchada Sirisomboonchai, 則永行庸

日本エネルギー学会大会講演要旨集 33 巻 ( 0 ) 頁： 166 - 167 2024年7月

6-2-2　自動車シュレッダーダスト処理ガスを原料とするメタン合成プロセスに関する検討査読有り

中村真季, Li Qiao, Chopendra G. Wasnik, 則永行庸

日本エネルギー学会大会講演要旨集 33 巻 ( 0 ) 頁： 162 - 163 2024年7月

6-2-3　酸化セリアや炭化ケイ素に担持した二元系金属触媒によるCO2メタネーションに関する検討査読有り

Chopendra G. Wasnik, 中村真季, 島⽥⼤輝, 町田洋, 則永行庸

日本エネルギー学会大会講演要旨集 33 巻 ( 0 ) 頁： 164 - 165 2024年7月

環境リサイクル部会　座談会査読有り

野田玲治, 則永行庸, 伏見千尋, 榎本啓士, 細貝聡, 太田智久

日本エネルギー学会機関誌えねるみくす 103 巻 ( 4 ) 頁： 422 - 431 2024年7月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人日本エネルギー学会

2024年４月に旧ガス化部会と旧リサイクル部会が合併し，環境リサイクル部会が発足しました。新部会発足にあたり，幹事の皆様に，簡単な自己紹介後，環境リサイクル部会が関わる脱炭素，サーキュラーエコノミー等について座談会を行い，さらに今後の部会での活動抱負についてもお話をお聞きしました。なお，今回の座談会は，予定の合った幹事で開催しました。

DOI： 10.20550/jieenermix.103.4_422

CiNii Research

LNG Oxy-Fuel Power and Green Methanol Poly Generation Systems Associated with CO2 Condensation Capture: Techno-Economic Environmental Assessment 査読有り

Li, Q; Machida, H; Feng, ZM; Norinaga, K

ENERGY & FUELS 38 巻 ( 14 ) 頁： 13089 - 13103 2024年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Energy and Fuels

To achieve energy-environment synergy and sustainability, this study proposes a poly generation system that integrates the energy release process of liquefied natural gas (LNG) oxy-fuel power generation with the energy storage process of green methanol synthesis from renewable energy. In this system, oxygen, the byproduct of water hydrolysis to hydrogen, can support LNG oxy-fuel power generation; while the cold energy released during LNG regasification can serve as a cold source for carbon capture, the captured CO2 can be utilized as the carbon source for methanol synthesis, thus realizing cleaner methanol production and an efficient power generation process with near-zero carbon emission. Following the process design, the parameters were optimized with minimum levelized production cost of methanol and electricity as the objective function through Matlab using the “MADS” algorithm, resulting in 683.79 $/tonne and 68.05 $/MW h, respectively, with overall exergy efficiency of 50.28%. Notably, as green methanol synthesis requires additional CO2, a reduction of 2272.59 kg/h can be achieved. The study concludes that the novel poly generation process is superior in exergy efficiency and CO2 capture and utilization but inferior in high production costs.

DOI： 10.1021/acs.energyfuels.4c01250

Web of Science

Scopus

Environmental-friendly extraction of di(2-ethylhexyl) phthalate from poly (vinyl chloride) using liquefied dimethyl ether 査読有り

Wang, T; Kanda, H; Kusumi, K; Mei, L; Zhang, LJ; Machida, H; Norinaga, K; Yamamoto, T; Sekikawa, H; Yasui, K; Zhu, L

WASTE MANAGEMENT 183 巻頁： 21 - 31 2024年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Waste Management

Poly(vinyl chloride) (PVC) is one of the most widely used plastics. However, a major challenge in recycling PVC is that there is no economical method to separate and remove its toxic phthalate plasticizers. This research made a breakthrough by extracting PVC with liquefied dimethyl ether (DME) and successfully separating the plasticizer components. Nearly all (97.1 %) of the di(2-ethylhexyl) phthalate plasticizer was extracted within 30 min by passing liquefied DME (285 g) through PVC at 25 °C. The compatibility of PVC with organic solvents, including liquefied DME, was derived theoretically from their Hansen solubility parameters (HSP), and actual dissolution experiments were conducted to determine the optimal PVC solvents. A liquefied DME mixture was used to dissolve PVC, and the extract was diluted with ethanol to precipitate the dissolved PVC. We demonstrated that liquefied DME is a promising method for producing high quality recycled products and that the process retains the fundamental properties of plasticizers and PVC without inducing degradation or depolymerization. Because of its low boiling point, DME can be easily separated from the solute after extraction, allowing for efficient reuse of the solvent, extracted plasticizer, and PVC. DME does not require heat and produces little harmful wastewater, which significantly reduces the energy consumption of the plasticizer additive separation process.

DOI： 10.1016/j.wasman.2024.04.050

Web of Science

Scopus

PubMed

Energy optimization of a non-aqueous solvent CO2 absorption system with pressure swing regeneration 査読有り

Chairunnisaa; Zhou, YX; Wu, YT; You, C; Thu, K; Miyazaki, T; Uehara, Y; Machida, H; Norinaga, K

INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL 135 巻 2024年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：International Journal of Greenhouse Gas Control

This study focuses on optimizing the energy requirement in the post-combustion CO2 capture system using pressure swing regeneration through a model-based design (MBD). The simulation results highlight the significant impact of CO2 recovery, inlet gas and liquid flow rate, and CO2 concentration in the flue gas on the overall energy demand of the system. Moreover, an investigation into the de-sublimation chamber was undertaken, revealing a relationship between dry ice formation and the heat transfer between the LNG stream and CO2 in the heat exchanger. The parametric analysis study reveals that the sensible heat of the lean solvent is significantly influenced by the CO2 concentration in the liquid, consequently affecting the overall system energy. According to the results, the utilization of cold energy from LNG could save 80 % of the total energy requirement. The optimization results found the best working condition, which consumes energy of 0.190 GJ/ton CO2, 31 % lower than the basic scenario.

DOI： 10.1016/j.ijggc.2024.104154

Web of Science

Scopus

High-Throughput CO2 Solubility Measurement in Miscible and Liquid-Liquid Phase Separation Types of Amine Solvent Using Headspace Gas Chromatography 査読有り

Tran, KVB; Yanase, K; Rao, TU; Hirayama, M; Norinaga, K; Machida, H

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 63 巻 ( 13 ) 頁： 5823 - 5832 2024年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Industrial and Engineering Chemistry Research

CO2 solubility is one of the key factors in evaluating not only the efficiency of the absorbent but also the energy consumption of the CO2 capture process from flue gas. In this study, a system namely headspace gas chromatography (HS-GC), which is a combination of gas chromatography (GC-3200, GL Sciences) and a headspace autosampler (Turbomatrix HS16, PerkinElmer), was developed to measure the CO2 solubility of amine solutions. The equilibrium time and calibration curve of this system were checked and compared with those of the literature data. The developed system showed high reproducibility with reference CO2 solubility data of benchmark amine solutions. Distinct from conventional measurement methods of CO2 solubility, high-throughput CO2 solubility measurement by HS-GC shows its advantages such as a small amount sample requirement, rapid achievement of equilibration time, automation of sample exchange, and high reproducibility, which is superior in the amine solvent screening phase. Moreover, this system can evaluate new types of CO2 capture solvents, including the phase separation solvent. By acquiring continuous data, the inflection point in the solubility curve indicated by phase separation was observed. The absorption heat estimated from those CO2 solubility curves measured by this system also agrees well with the experimental data.

DOI： 10.1021/acs.iecr.3c03314

Web of Science

Scopus

Design and optimization of the flexible poly- generation process for methanol and formic acid from CO2 hydrogenation under uncertain product prices 査読有り

Li, Q; Machida, H; Ren, XS; Feng, ZM; Norinaga, K

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 54 巻頁： 635 - 651 2024年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：International Journal of Hydrogen Energy

During the design of the carbon capture and hydrogen storage process, a static CO2 hydrogenation poly-generation process for methanol and formic acid synthesis was developed, thereby reducing recycling flow and feedstock losses in the single methanol synthesis process and increasing product diversity. Additionally, a novel flexible poly-generation process was proposed as the product prices fluctuated with the market environment throughout the plant's life cycle. For the static poly-generation process, a mixed integer nonlinear programming model was established, followed by the Mesh Adaptive Direct Search algorithm to determine the optimal parameter design. For flexible processes, with the unscented transform tool, a two-stage optimization strategy is proposed for obtaining optimal design and operating parameters that are computationally tractable. With an input CO2 flow rate of 200 kmol/h, the results show (1) the static process with an optimal Return On Investment of 13.05%, a fixed investment cost of $ 34.14 × 106, and an annual net profit of 4.46 × 106 $/year; and (2) the flexible process, in which the flexibility indices of the methanol and formic acid production units are 1.088 and 1.194, respectively, resulting the fixed investment cost increase to $ 39.19 × 106, an increase of 14.79%. Accordingly, the annual net profit increased by 8.97% to 4.86 × 106 $/year, while the Return On Investment decreased by 4.67%–12.44%. For investment decision-makers, the flexible poly-generation process can achieve higher profits and reduce potential market risks when they have adequate financing.

DOI： 10.1016/j.ijhydene.2023.01.205

Web of Science

Scopus

researchmap

Regulation of temperature distribution in fixed bed reactor for CO2 methanation through "CHESS" monolith structure catalyst 査読有り

Zhang, W; Lin, YX; Zhang, YM; Li, TL; Li, JZ; Chen, ZW; Norinaga, K

APPLIED THERMAL ENGINEERING 236 巻 2024年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Applied Thermal Engineering

CO2 methanation suffers from the problem of temperature runaway phenomenon due to its exothermic nature. To mitigate this issue, optimizing catalyst structure becomes crucial. This work established numerical models to investigate the CO2 methanation reaction and heat/mass transfer process in the reactor with porous pellet and monolithic catalysts. Results show that the reactor with porous pellets has the lowest carbon conversion per unit pressure drop due to its large total pressure drop. In contrast, the reactor with monolith exhibits a much larger carbon conversion per unit pressure drop but a smaller absolute carbon conversion. Based on this, an improved “CHESS” monolith structure was proposed and improved, which not only maintains a high absolute carbon conversion (62.6 %) but also enhances the heat transfer process in CO2 methanation. Moreover, compared with the reactor with porous pellets, the maximum temperature in the improved “CHESS” monolith was decreased by around 11.09 %.

DOI： 10.1016/j.applthermaleng.2023.121826

Web of Science

Scopus

CO<inf>2</inf> methanation over low-loaded Ni-M, Ru-M (M = Co, Mn) catalysts supported on CeO<inf>2</inf> and SiC 査読有り

Wasnik C.G., Nakamura M., Shimada T., Machida H., Norinaga K.

Carbon Resources Conversion 2024年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Carbon Resources Conversion

The concentration of the major greenhouse gas CO2 is rapidly increasing in the atmosphere, leading to global warming and a range of environmental issues. An efficient circulation and utilization of CO2 is critical in the current environmental context. Methanation, an exothermic process, emerges as a critical strategy for effective CO2 utilization. On this front, there is a significant demand for rational design of catalysts that maintain high activity and methane selectivity over a wide temperature range (250–550 °C). The catalyst that can promise a consistent reaction even at 500 °C under an atmospheric pressure is thus obliged. The present study investigated bimetallic catalysts with SiC, which is known for its exceptional thermal conductivity, and CeO2, which is characterized by its CO₂ affinity, as base materials. We incorporated Ni-M and Ru-M (M = Co and Mn) as the active metals, each loaded at 2 %. Impressively, with merely 20 mg, the Ni-Co/SiC catalyst achieved a CO2 conversion rate of 77 % and CH₄ selectivity of 88 % at 500 °C, in a fixed-bed tubular reactor system with conditions of H2/CO2 = 4, a total flow rate of 70 ml min−1, and a steady GHSV of 12,000 h−1. Moreover, 2Ni-2Co/CeO2 catalyst demonstrated exceptional performance with a 76 % conversion of CO2 and a 83 % selectivity for CH4, all under identical conditions. The catalyst's durability was confirmed by a subsequent 40-hour stability test, which showed only a 3–5 % degradation. The developed catalysts were comprehensively characterized by BET/BJH, CO pulse chemisorption, H2-TPR, HAADF-STEM-EDS, SEM-EDS and XRD etc. to unveil their physicochemical and surface traits. It was found that Co and Mn, when integrated, effectively restrained the agglomeration of Ni and Ru particles, ensuring optimal metal dispersion on the support. In conclusion, our synthesized bimetallic catalysts shown a sustained catalytic capability, even in the high-temperature environment.

DOI： 10.1016/j.crcon.2024.100241

Scopus

1-02　種々の石炭の噴流床ガス化におけるタールやすす生成特性の詳細化学反応速度モデルを用いた解析査読有り

李泰霖, 中村真季, 上原友輔, 町田洋, 則永行庸

石炭科学会議発表論文集 60 巻 ( 0 ) 頁： 4 - 5 2023年10月

1-08　二酸化炭素水素化反応器の成形触媒形状レベルで解像した数値流体力学解析査読有り

島田大輝, Lin Yixiong, 中村真季, 則永行庸

石炭科学会議発表論文集 60 巻 ( 0 ) 頁： 16 - 17 2023年10月

CFD simulation of CO2 methanation through the Sabatier reaction in a shell-and-tube reactor incorporating phase change on the shell side 査読有り

Fukumoto, K; Zhang, W; Mizoguchi, R; Lin, YX; Choi, C; Machida, H; Norinaga, K

FUEL 349 巻頁： 128126 - 128126 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Fuel

This paper reports a computational fluid dynamics simulation of carbon dioxide (CO2) methanation via the Sabatier process in a shell-and-tube reactor, incorporating a water phase change simulation on the shell side using the volume of fluid (VOF) method. The essential heat removal factors and their mechanisms, such as the catalyst size, bed porosity, thermal conductivity, coolant flow rate, and coolant boiling, were primarily investigated. The computational code was a newly developed in-house version of ChtMultiRegionFOAM based on OpenFOAM v2006. This code can simulate catalyst-gas heat transfer, which is called the two-temperature model. The code was extended to new methanation and phase-change models based on the VOF method. The computational code was first validated using existing experimental data. After sufficient accuracy was confirmed, several parametric studies were conducted. Catalyst heat conductivity was the most influential factor among the catalyst-related parameters. The flow rate of the oil coolant significantly affected the cooling performance. Finally, the use of boiling water significantly reduced the coolant flow rate. Moreover, the cooling performance remained unchanged until the total heat release rate from the gas exceeded the total latent heat of the water.

DOI： 10.1016/j.fuel.2023.128126

Web of Science

Scopus

researchmap

Modeling the Chemical Structures of Coals with Different Classifications Using Mean Molecular Weights

Hata, Y; Hayashizaki, H; Takanohashi, T; Takahashi, T; Kanehashi, K; Norinaga, K

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN 109 巻 ( 10 ) 頁： 792 - 801 2023年10月

Facile Synthesis and Insight of Atomically Dispersed Ni Catalyst on N-Doped Carbonized Lignin for Highly Efficient Electrochemical CO2 Reduction to CO 査読有り

Park, GD; Sirisomboonchai, S; Norinaga, K

CHEMSUSCHEM 16 巻 ( 16 ) 頁： e202300530 2023年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ChemSusChem

For the electrochemical CO2 reduction reaction (CO2RR), the single-metal atom catalysts (SACs) on N-doped carbon are considered promising alternatives to conventional catalysts owing to their unique electrocatalytic properties. However, environmentally friendly methods to prepare SACs are still required. Herein, Ni SAC was synthesized using lignin derived from biomass whose structural and chemical properties render it suitable as both a base carbon matrix and a metal chelating agent. The coordination environment of active Ni−Nx sites was readily manipulated by controlling thermal activation. The Ni SAC on lignin-derived N-doped carbon achieved an outstanding CO Faradaic efficiency of 98.2 % at −0.9 V vs. RHE, which is comparable to those of conventional SACs. Experimental results combined with DFT calculations demonstrate the optimal conditions for manufacturing Ni SAC which is highly selective for CO2-to-CO conversion and the effect of the electronic structure of Ni atom on CO2RR kinetics.

DOI： 10.1002/cssc.202300530

6-1-1 バイメタル被覆銅フォーム電極を用いた電気化学的CO2還元-酸素発生反応システムの構築査読有り

シリソンブーンチャイスチャダ, 町田洋, 則永行庸

日本エネルギー学会大会講演要旨集 32 巻 ( 0 ) 頁： 116 - 117 2023年8月

4-4-1 流体温度が昇華槽内の伝熱挙動に及ぼす影響査読有り

山口博泰, 上原友輔, 町田洋, 則永行庸, 齋藤泰洋

日本エネルギー学会大会講演要旨集 32 巻 ( 0 ) 頁： 90 - 91 2023年8月

　前のページ - 次のページ　

<則永 行庸>

論文 - 則永 行庸

<則永　行庸>

論文 - 則永　行庸