Article
Green & Sustainable Science & Technology
Jingwei Chen, Yang Liu, Xiaomin Wu, Jiaqiang E, Erwei Leng, Feng Zhang, Gaoliang Liao
Summary: This paper investigates the thermodynamic and environmental performance of supercritical water gasification for hydrogen production using residue from a simultaneous saccharification and fermentation (SSF) process. The results show that increasing temperature and decreasing residue concentration can enhance the hydrogen production rate. Additionally, two methods to improve energy efficiency, including recycling waste heat and reheating cycle, are proposed.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Thermodynamics
Minmin Sun, Jianliang Zhang, Kejiang Li, Mansoor Barati, Zhibin Liu
Summary: Renewable and carbon-neutral biomass is being explored as a substitute for metallurgical coke in ironmaking. This study found that biochar obtained from hydrothermal carbonization and pyrolysis of bamboo can partially replace coke, with each type of biochar offering unique benefits for the process.
Article
Chemistry, Physical
Daniil Salionov, Christopher Hunston, Frederic Vogel, David Baudouin, Sasa Bjelic
Summary: Supercritical water gasification (SCWG) of glycerol was conducted using Ru/CNF catalyst in a fixed-bed reactor. The study investigated the chemical composition and formation mechanism of coke deposits on the catalyst. The results showed that carbon deposition was observed under kinetic conditions, and the composition of the deposits was influenced by the space velocity.
JOURNAL OF CATALYSIS
(2023)
Article
Green & Sustainable Science & Technology
Noah Luciano Taufer, Vittoria Benedetti, Matteo Pecchi, Yukihiko Matsumura, Marco Baratieri
Summary: This study investigated a combined process of hydrothermal carbonization (HTC) and supercritical water gasification (SCWG) to fully utilize digestate from anaerobic digestion. The results showed that increasing SCWG temperature led to higher carbon yield and hydrogen content in the gas phase, while increasing residence time resulted in a decrease in carbon yield in the gas phase. Increasing feedstock concentration led to a higher gas generation rate.
Article
Energy & Fuels
Yanlin Su, Wei Zhou, Junfeng Li, Jihui Gao, Pengxiang Wang, Guangbo Zhao, Yukun Qin
Summary: This study demonstrates that microwave technology can significantly enhance flame combustion by generating plasma during the combustion process. The carbonization temperature and particle size of coke are identified as the main factors influencing the formation of centimeter-scale plasma. The production of CO is found to be correlated with microwave discharge. This research provides new insights into the microwave enhancement mechanism in gas-solid heterogeneous reactions.
Article
Thermodynamics
Xin Yu, Dunxi Yu, Fangqi Liu, Jingkun Han, Jianqun Wu, Minghou Xu
Summary: The study found that high-sulfur petroleum coke has little impact on co-gasification, while rice straw shows a significant catalytic effect only after being completely gasified into ash. Under high-concentration steam conditions, the main components of synthesis gas are H-2 and CO2, and rice straw ash exhibits a violent melting state.
Article
Chemistry, Physical
Ewa Sygula, Michalina Galezowska, Andrzej Bialowiec
Summary: Methane fermentation of organic waste is a method for reducing global organic waste, and adding biochar to the fermentation process increases biogas production potential. Sulfur waste can be utilized in composites with other materials, including biochar, for synergistic recycling. This study found that adding a sulfur-biochar composite to the fermentation process improves biogas production and kinetics.
Article
Energy & Fuels
Libo Lu, Wenwen Wei, Fan Liu, Zhiwei Ge, Hui Jin, Yunan Chen, Liejin Guo
Summary: Supercritical water gasification (SCWG) is a promising technology for the treatment of black liquor and energy recycling. However, the transformation of sulfur during the SCWG process is not well understood. In this study, the effects of different parameters on gasification and sulfur transformation were investigated. The results showed that reaction temperature played a crucial role, and H-2 was the most important gaseous product. After SCWG treatment, sulfur mainly existed in the form of sulfide. The findings of this study provide a basis for the resource utilization of black liquor and a promising method for sodium sulfide production.
Article
Engineering, Environmental
Mohammed Awad, Zhe Tian, Yu Zhang, Min Yang, Wenjuan Yin, Liping Dong
Summary: The study evaluated the feasibility of using hydrothermal pretreatment to remove oxytetracycline from fermentation residue and enhance anaerobic digestion at different temperatures. The results showed that optimal removal of OTC was achieved at 130 degrees C for 5 minutes, significantly reducing the concentration of OTC and promoting methane production in anaerobic digestion.
ENVIRONMENTAL ENGINEERING RESEARCH
(2021)
Review
Chemistry, Multidisciplinary
Kapil Khandelwal, Sonil Nanda, Philip Boahene, Ajay K. Dalai
Summary: The global warming problem caused by the rapid use of fossil fuels is leading to an increased demand for sustainable energy sources, such as hydrogen. The demand for hydrogen has quadrupled from 18 million tons in 1975 to 90 million tons in 2020, and is projected to reach 180 million tons by 2030. This article reviews the conversion of biomass into hydrogen-rich syngas using supercritical water gasification, focusing on the thermophysical properties of supercritical water and the parameters influencing water gasification. The processes and reactions influencing the distribution of products during water gasification include hydrolysis, water-gas shift, methanation, hydrogenation, and reforming.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Miao Gong, Aixin Feng, Linlu Wang, Mengqi Wang, Jinxiang Hu, Yujie Fan
Summary: Hydrothermal pretreatment and supercritical water gasification were combined to treat dewatered sludge for hydrogen production. Optimal pretreatment conditions were found to transfer 31% of carbon in sludge into liquid products, and the subsequent supercritical water gasification process with catalysts showed improved H-2 selectivity, yield, and energy recovery.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Analytical
Qing Wang, Xu Zhang, Da Cui, Jingru Bai, Zhichao Wang, Faxing Xu, Zhenye Wang
Summary: Supercritical water gasification (SCWG) with biomass is a process that converts biomass feedstock into hydrogen-rich syngas through thermal decomposition and hydrolysis. This review discusses the relationship between cellulose, hemicellulose, lignin, and hydrogen production, as well as the effects of reaction conditions and catalysts on SCWG. The results highlight the significant impact of temperature and catalysts on SCWG, while other operating conditions play a secondary role. However, the SCWG mechanism of real lignocellulosic biomass and the interaction relationship of its components still require further study. Furthermore, the development of stable and efficient catalysts is crucial for the advancement of this technology.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Green & Sustainable Science & Technology
Mi Yan, Jianyong Liu, Kunio Yoshikawa, Jiahao Jiang, Yan Zhang, Gaojun Zhu, Yu Liu, Dwi Hantoko
Summary: This study investigated a cascading energy recovery process by integrating hydrothermal carbonization (HTC) and supercritical water gasification (SCWG) for the efficient disposal and conversion of HTC process water. The results showed that energy densified hydrochar could be obtained through HTC, while SCWG efficiently converted the HTC process water into H-2-rich syngas.
Article
Energy & Fuels
Changqing Cao, Yupeng Xie, Linhu Li, Wenwen Wei, Hui Jin, Sheng Wang, Wenhao Li
Summary: The co-precipitated CeO2-ZrO2 catalyst enhanced the gasification efficiency and hydrogen production of lignin and cellulose in supercritical water, with a more significant impact at lower temperatures. The catalyst reduced cyclopentenone and furan derivatives while increasing refractory phenols in the aqueous product, with CeO2 identified as the main active component catalyzing gasification through redox reactions. ZrO2 improved CeO2's catalytic activity by lowering the reduction temperature in hydrogen, increasing dispersion, and facilitating H-2 adsorption on the catalyst surface.
Article
Chemistry, Physical
Tingyu Lei, Xingchen Liu, Amar Deep Pathak, Sharan Shetty, Qingya Liu, Xiaodong Wen
Summary: This study examined the mechanism of carbon deposition and hydrogenation on Fe clusters using the DFTB-NMD method, revealing the formation of carbon chains, rings, and fused rings during deposition. Hydrogenation of activated carbon occurs via direct C-H coupling, while hydrogenation of graphitic carbon involves various reactions. The Fe catalyst primarily provides active sites for hydrogen dissociation and spillover, with limited activity in C-C bond breaking.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
David Scholz, Oliver Krocher, Frederic Vogel
Article
Green & Sustainable Science & Technology
Katarzyna R. Arturi, Hulya U. Sokoli, Erik G. Sogaard, Frederic Vogel, Saga Bjelic
JOURNAL OF CLEANER PRODUCTION
(2018)
Article
Energy & Fuels
Dominik Gschwend, Sebastian Mueller, Alexander Wokaun, Frederic Vogel
Article
Chemistry, Physical
Katarzyna R. Arturi, Sergey Kucheryavskiy, Rudi P. Nielsen, Marco Maschietti, Frederic Vogel, Sasa Bjelic, Erik G. Sogaard
JOURNAL OF SUPERCRITICAL FLUIDS
(2019)
Article
Chemistry, Multidisciplinary
Sasa Bjelic, Luca Garbuio, Katarzyna R. Arturi, Jeroen A. van Bokhoven, Gunnar Jeschke, Frederic Vogel
Article
Chemistry, Physical
Sasa Bjelic, Urs Gasser, Ivo Alxneit, Frederic Vogel
Article
Energy & Fuels
Dominik Gschwend, Patrik Soltic, Alexander Wokaun, Frederic Vogel
Article
Chemistry, Physical
F. Mangold, St Pilz, S. Bjelic, F. Vogel
JOURNAL OF SUPERCRITICAL FLUIDS
(2019)
Review
Energy & Fuels
Jukka Lappalainen, David Baudouin, Ursel Hornung, Julia Schuler, Kristian Melin, Sasa Bjelic, Frederic Vogel, Jukka Konttinen, Tero Joronen
Article
Engineering, Chemical
Runyu Wang, Roger Deplazes, Frederic Vogel, David Baudouin
Summary: This study investigated the phase behavior of inorganic salts in black liquor in supercritical water and optimized the conditions for salt separation. The potassium-to-sodium ratio was found to significantly impact the phase behavior of the salt mixture. Stable salt separation could be achieved at a certain ratio, allowing for the continuous extraction of up to 96% of salts.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Engineering, Chemical
Katarzyna Arturi, Thomas Rohrbach, Frederic Vogel, Sasa Bjelic
Summary: The study utilized acidic oxidation in a biphasic water/octanol system to increase yields of high-value aromatic monomers from Kraft lignin, achieving promising results. Biphasic depolymerization technique enabled high monomeric yields and a wide variety of aromatic monomers to be produced.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Christopher Hunston, David Baudouin, Leo Koning, Ayush Agarwal, Oliver Kroecher, Frederic Vogel
Summary: The performance of Ru catalysts with different sizes of Ru nanoparticles (NP) in continuous supercritical water gasification (SCWG) of glycerol was evaluated. It was demonstrated that Ru NPs smaller than 1.2 nm had high initial turnover frequencies (TOF). Deactivation of the catalysts was mainly caused by coking and sintering. A correlation between TOF and the density of surface Ru atoms was found, and an optimal surface density resulted in high initial and steady-state TOFs, prolonging the lifetime by delaying coke formation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Christopher Hunston, David Baudouin, Mohamed Tarik, Oliver Kroecher, Frederic Vogel
Summary: The study investigated the mechanisms of active phase loss from Ru/AC catalysts in continuous supercritical water gasification for the first time. Results showed that AC-supported Ru catalysts exhibited superior long-term activity and the Ru loss mainly occurred in the form of ionic leaching during steady-state operation.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Chemical
David Baudouin, Daniil Salionov, Frederic Vogel, Sasa Bjelic
Summary: Hydrothermal processes show promise in efficiently utilizing wet biomass feedstocks or wastes, with their performance being dependent on feedstock composition and advancements in analyzing complex mixtures and effluents. Catalytic hydrothermal gasification was used to valorize process water, achieving good energy transfer to synthetic natural gas and mineral extraction. High-pressure liquid chromatography-high-resolution mass spectrometry analysis identified key factors for improving synthetic natural gas yields, such as increasing temperature in the salt separator.
ACS ENGINEERING AU
(2021)
Article
Chemistry, Multidisciplinary
David Scholz, Jingwei Xie, Oliver Kroecher, Frederic Vogel
Article
Agricultural Engineering
G. Grasa, I. Martinez, R. Murillo
Summary: Gasification kinetics of six chars from residual origin were studied under relatively low temperature, low CO2, and high H2O partial pressures. The Random Pore Model (RPM) showed the best fit to experimental results, but the selection of the reaction model depended on the ash composition, specifically the presence of alkali and alkaline earth metals. Chars with ash content higher than 30% wt. were modeled with the RPM model, while chars with the highest K/Si ratio required modified versions of the RPM to accurately predict reaction rates. Textural properties played a key role in determining reaction parameters, such as the pre-exponential factor and activation energy, for chars with similar ash content and composition.
BIOMASS & BIOENERGY
(2024)
Review
Agricultural Engineering
V. Godvin Sharmila, Surya Prakash Shanmugavel, J. Rajesh Banu
Summary: Proper treatment and disposal of biomass waste is crucial to prevent environmental deposition and its negative impacts. Biofuel has emerged as a potential alternative to fossil fuels, reducing carbon emissions and meeting global energy demands. This review examines different biomass waste conversion techniques and explores the production of biofuels with zero carbon emissions. Research on anaerobic treatment, metabolic engineering, and artificial intelligence has been conducted to enhance biofuel production efficiency.
BIOMASS & BIOENERGY
(2024)
Review
Agricultural Engineering
Selvakumar Periyasamy, Adane Asefa Adego, P. Senthil Kumar, G. G. Desta, T. Zelalem, V. Karthik, J. Beula Isabel, Mani Jayakumar, Venkatesa Prabhu Sundramurthy, Gayathri Rangasamy
Summary: Valorizing agricultural waste into valuable products is crucial for environmental protection and bioeconomy advancement. Preprocessing of agricultural waste is a critical step to convert free carbohydrate molecules for final conversion, and factors such as biomass nature, feed loading, pH, temperature, and time influence the process. This review provides comprehensive information on agricultural waste availability, preprocessing techniques, and factors influencing performance.
BIOMASS & BIOENERGY
(2024)
Article
Agricultural Engineering
Aqueel Ahmad, Ashok Kumar Yadav, Achhaibar Singh, Dinesh Kumar Singh
Summary: The study focuses on predicting and optimizing the yield of biogas production in an anaerobic digester using co-digestion. Experimental data was used to develop a machine learning-based prognostic model, and the Response Surface Methodology (RSM) was employed to optimize the parameters. The results demonstrate that RSM coupled with machine learning is an effective technique for modeling, predicting, and optimizing biogas production yield.
BIOMASS & BIOENERGY
(2024)
Article
Agricultural Engineering
Yijing Zhong, Wenxiang Zhai, Xinli Wei
Summary: This paper studies the thermal stability and decomposition of cork materials with and without silica aerogel filler. The results show that the decomposition is inhibited and the pyrolysis is significantly reduced with the addition of silica aerogel. This finding suggests that silica aerogel-infused cork may be a promising raw material for biofuel production with reduced environmental pollution.
BIOMASS & BIOENERGY
(2024)