Article
Energy & Fuels
Hary Demey, Gilles Ratel, Bruno Lacaze, Olivier Delattre, Geert Haarlemmer, Anne Roubaud
Summary: In this study, the wastewater from hydrothermal liquefaction of black liquor was treated and utilized for hydrogen production through supercritical water gasification (SCWG). The effects of main process parameters on conversion yield were investigated. Experimental tests were conducted at different temperatures (below and above the critical point of water): 350°C, 450°C, and 600°C. The results showed that increasing temperature from 350°C to 600°C significantly improved the total gas yield. The use of a catalyst further enhanced carbon conversion and gas production, leading to even higher gas yields at mild operating temperatures.
Article
Chemistry, Applied
Ning Wei, Botian Hao, Donghai Xu, Xu Liu, Mingyan Ma, Yang Guo
Summary: This study investigated the pathways and kinetics of hydrogen production from indole gasification in supercritical water. The addition of an oxidant was found to enhance gasification efficiency and increase the yields of H2 and CO2.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Environmental Sciences
Thiago Barros, Jhonattas D. C. Carregosa, Alberto Wisniewski Jr, Antonio C. D. Freitas, Reginaldo Guirardello, Leandro Ferreira-Pinto, Lucas Bonfim-Rocha, Veeriah Jegatheesan, Lucio Cardozo-Filho
Summary: This study explores an alternative method for black liquor treatment through gasification, identifying liquid products mainly belonging to classes O3 and O4 under reaction at 500 degrees Celsius, and gaseous products including hydrogen and methane with high overall selectivity. The economic analysis shows that black liquor gasification has relatively low costs and is an interesting route for obtaining combustible gases and value-added bioproducts.
Article
Chemistry, Physical
Ionela-Dorina Dumbrava, Calin-Cristian Cormos, Arpad Imre-Lucaci, Ana-Maria Cormos
Summary: Glycerol, a by-product of biodiesel synthesis, can be transformed into an energy carrier for renewable energy. This study investigated the performance of a packed bed reactor using a Ni-based catalyst for hydrogen production from glycerol under supercritical conditions. The results showed high hydrogen yield and almost complete glycerol conversion. The optimal process parameters were determined through CFD modeling and validated with experimental data.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Yunan Chen, Lei Yi, Wenwen Wei, Hui Jin, Liejin Guo
Summary: The study on sewage sludge gasification in supercritical water found that temperature is the main factor affecting hydrogen yield, gasification efficiency, carbon gasification efficiency, and hydrogen yield potential. Additionally, the addition of mixed catalysts can promote reactions and the formation of hydrogen.
Article
Chemistry, Physical
Uremek Nihal Cengiz, Eyup Yildirir, Mehmet Saglam, Mithat Yuksel, Levent Ballice
Summary: Hydrothermal gasification of tomato processing plant waste and the catalytic effects were studied. Increasing pressure enhanced methane yield, while alkali addition improved both hydrogen and methane yields. The highest yields for H2 and CH4 were 27.4 and 21.8 moles kg-1 C, respectively.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Thermodynamics
Mohamad Mohamadi-Baghmolaei, Parviz Zahedizadeh, Abdollah Hajizadeh, Sohrab Zendehboudi
Summary: Biomass gasification has a great potential for sustainable energy production, and supercritical water gasification (SCWG) of biomass is a promising technology for sustainable hydrogen production. A new model is proposed to assess gas yields and char formation in the SCWG process, considering the presence of catalyst and deviation term for the Gibbs free energy of solid char. The results show that temperature and feed concentration have a significant impact on gas yields and char formation, while pressure has a less impactful effect. Energy analysis reveals that higher temperature, pressure, and biomass concentration have a positive impact on energy performance, and the minimum energy consumption per hydrogen production unit is achieved at 828.6 degrees C.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Environmental
Miao Gong, Jinxiang Hu, Qiao Xu, Yujie Fan
Summary: This study investigated the effects of reaction parameters on supercritical water gasification (SCWG) of Enteromorpha prolifera and the hydrogen production performance of commercial catalysts. The results showed that higher temperature, longer reaction time, and appropriate moisture content contributed to higher hydrogen yield. AlCl3 exhibited the highest catalytic performance, while the combined catalyst yielded slightly lower hydrogen. AlCl3 promoted biomass decomposition and hydrogen production, while the combination with H2O2 enhanced organic degradation and gasification.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Energy & Fuels
Kapil Khandelwal, Philip Boahene, Sonil Nanda, Ajay K. Dalai
Summary: Supercritical water gasification (SCWG) is used to convert crude glycerol into hydrogen-rich syngas. The study investigates the decomposition routes of different heterogeneous components and develops predictive models for H-2 gas yields. Results show that methanol exhibits the highest H-2 yield, followed by pure glycerol and oleic acid.
Article
Agricultural Engineering
Wen Cao, Yimeng Wei, Hui Jin, Shi Liu, Linhu Li, Wenwen Wei, Liejin Guo
Summary: In this study, an experimental investigation was conducted to evaluate the gasification characteristics of food waste in supercritical water. The results showed that higher reaction temperature and longer residence time promoted the gasification of food waste. The addition of catalysts improved the gasification performance by converting more liquid intermediates into gaseous products.
BIOMASS & BIOENERGY
(2022)
Article
Chemistry, Physical
Ender Faki, Sefika Turker Uzden, Acelya Secer, Arif Hasanoglu
Summary: The co-gasification of low rank lignite and sorghum energy crop was investigated under low temperature conditions with supercritical water. The study evaluated the effects of water volume, blending ratios, catalysts, and feedstock concentrations on gasification efficiency, product distribution, and hydrogen yield. Synergistic effects were observed with a coal content of 25 wt% in the coal/biomass mixture, and increasing water volume, decreasing feedstock concentration, and using alkali metal catalysts significantly improved gasification efficiency and hydrogen yield.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Wei Su, Ping Liu, Changqing Cai, Hongzhi Ma, Bo Jiang, Yi Xing, Yunyi Liang, Liping Cai, Changlei Xia, Quyet Van Le, Christian Sonne, Su Shiung Lam
Summary: The research utilized supercritical water gasification technology to convert Sedum plumbizincicola into hydrogen gas and immobilize heavy metals in biochar. High temperatures promoted hydrogen production, while biochar facilitated heavy metal adsorption and conversion into stable forms.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Analytical
Linhu Li, Xujun Li, Wen Cao
Summary: Supercritical water gasification (SCWG) is a clean technology for disposal and energy recovery of oily sludge. The study investigates the gaseous products of SCWG of oily sludge at different temperatures and residence times, and develops a kinetic model to optimize the production of H2 and CH4. The results show that H2 yield increases with temperature and residence time, while CH4 yield and carbon gasification efficiency peak at 600 degrees C. The liquid products contain alkene, acetone, benzene, toluene, ethyl -benzene, xylene, phenolic substances, and PAHs.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(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
Chemistry, Physical
Hui Jin, Weijing Ding, Bin Chen, Bin Bai, Qiuyang Zhao, Changqing Cao
JOURNAL OF MOLECULAR LIQUIDS
(2020)
Article
Engineering, Environmental
Changqing Cao, Ce Bian, Gaoyun Wang, Bin Bai, Yupeng Xie, Hui Jin
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Chemistry, Physical
Cui Wang, Hui Jin, Huifang Feng, Wenwen Wei, Changqing Cao, Wen Cao
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Thermodynamics
Chao Fan, Changqing Cao, Zhiwei Ge, Yunan Chen, Hui Jin
APPLIED THERMAL ENGINEERING
(2020)
Article
Energy & Fuels
Ce Bian, Rui Zhang, Liang Dong, Bin Bai, Wenhao Li, Hui Jin, Changqing Cao
Article
Chemistry, Physical
Weijing Ding, Jinwen Shi, Wenwen Wei, Changqing Cao, Hui Jin
Summary: This study investigated the solubility of PAH oil droplets in supercritical water/hydrogen environment through molecular dynamics simulation, revealing that heavy PAHs are stable in the water phase, while supercritical water and hydrogen promote their miscibility. Additionally, high density and temperature facilitate rapid solvation of PAHs in supercritical water/hydrogen environment, providing theoretical support for the development of complete coal gasification technology for hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Green & Sustainable Science & Technology
Changqing Cao, Yupeng Xie, Liuhao Mao, Wenwen Wei, Jinwen Shi, Hui Jin
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
Engineering, Chemical
Changqing Cao, Yupeng Xie, Yi Chen, Jie Lu, Jinwen Shi, Hui Jin, Sheng Wang, Lan Zhang
Summary: In this study, CuO-ZnO and Fe2O3-Cr2O3 catalysts were prepared and evaluated for their catalytic activity in super-critical water gasification. The reduction of oxides in the catalysts releases active oxygen species to promote organic decomposition and hydrogen production. Fe2O3 was reduced to Fe3O4 at 500 and 600 degrees C, while CuO was reduced to Cu at both temperatures.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Weizuo Wang, Bin Bai, Wenwen Wei, Changqing Cao, Hui Jin
Summary: This study investigated the conversion characteristics of urea-formaldehyde (UF) plastics using supercritical water, analyzing the impact of different operating parameters on the gasification process. By comparing with polystyrene (PS) plastics, the properties and inhibition mechanism of thermoset plastics were examined.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Changqing Cao, Lihui Yu, Yupeng Xie, Wenwen Wei, Hui Jin
Summary: CuO-ZnO catalyst synthesized by sol-gel method showed the highest catalytic performance in lignin gasification in supercritical water. The sol-gel catalyst had the smallest crystallite size, largest specific surface area, and high dispersion. The gasification efficiency was improved by adjusting the CuO/ZnO ratio and calcination temperature, and the addition of ethanol and PEG in the solvent during sol-gel preparation enhanced the catalytic activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Yi Li, Huibo Wang, Jinwen Shi, Changqing Cao, Hui Jin
Summary: The study investigates the natural convection and temperature distribution of supercritical water in a side-wall heated cavity, revealing a double-vortex natural convection pattern and overheating phenomenon. Factors such as temperature, pressure, temperature difference, and aspect ratio all impact velocity and temperature within the cavity.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Energy & Fuels
Lihui Yu, Rui Zhang, Changqing Cao, Lanjun Liu, Jiabin Fang, Hui Jin
Summary: In this study, the supercritical water gasification of dealkaline lignin catalyzed by different zeolite-supported Ni catalysts was investigated. The catalysts, except Ni/ZSM-5, enhanced the gasification, with the highest activity observed for Ni/4A. Ni/4A had mesopores of suitable size for Ni dispersion and provided more active sites. The use of Ni/4A improved the gasification efficiency and hydrogen production, but the effect diminished after 20 min of reaction time.
Article
Green & Sustainable Science & Technology
Oraleou Sangue Djandja, Bin Duan, Lin-Xin Yin, Changqing Cao, Yaqi Shan, Jia Duo, Guodong Yao, Pei-Gao Duan
Summary: This study investigated the effect of ammonia solution on hydrothermal carbonization (HTC) of sewage sludge (SS). The addition of ammonia promoted hydrolysis of the SS and increased the yield of hydrochar (HC). The total organic carbon (TOC) of the aqueous phase was significantly improved compared to water alone, but decreased with increasing temperature. Ammonia addition resulted in the formation of N-heterocyclics as the main compounds in the aqueous phase, while O-containing compounds were predominant in water alone. Amines and ammonia promoted the formation of pyrazine derivatives, with pyrazine derivatives being the most represented in the aqueous phase. The nitrogen content in the HC increased with increasing temperature due to polymerization of N-compounds. Insoluble phosphorus in the HC was promoted by the basic environment created by ammonia addition.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Review
Engineering, Chemical
Hui Jin, Weijing Ding, Bin Bai, Changqing Cao
Summary: This paper presents an overview of MD simulation investigations applied in various systems involving supercritical water (SCW). The review explores different research areas, including the applications of MD simulation in studying the properties of SCW, pyrolysis/gasification systems with SCW, dissolution systems, and oxidation systems with SCW. The paper also discusses the advances, problems, and possible future directions for MD simulation studies in this area.
REVIEWS IN CHEMICAL ENGINEERING
(2022)
