Article
Engineering, Environmental
K. D. P. Lakshmee Kumar, B. Neelam Naidu, Bipul Sarkar, Prasenjit Mondal, Kaushik Ghosh, V. V. D. N. Prasad
Summary: The catalytic efficiency of Ru incorporated Co-based catalysts supported on MgO-Al2O3 mixed oxide with La and Ce promoters was studied for syngas production by methane tri reforming, aiming to effectively utilize CO2 from various sources. The coexistence of Co and Ru enhanced reactants' conversion and catalyst stability through bimetallic synergy. The addition of La facilitated a better La-(Co-Ru)-support interface, resulting in superior coke resistivity and high conversions of CH4 and CO2 during a 100-hour time on stream study.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Applied
Jaylin Sasson Bitters, Tina He, Elizabeth Nestler, Sanjaya D. Senanayake, Jingguang G. Chen, Cheng Zhang
Summary: Dry reforming of methane (DRM) is a process that converts carbon dioxide and methane into syngas, which can be used to produce various products. However, carbon deposition is a major cause of catalyst deactivation in DRM. Bimetallic catalysts, with their synergistic effects, improve catalytic stability and show potential in mitigating carbon deposition deactivation.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Qiangqiang Xue, Zhengwen Li, Huilin Yi, Zhao Jiang, Binhang Yan, Yujun Wang, Guangsheng Luo
Summary: Metal-sintering and carbon-deposition are two challenges in hydrogen production, but they can be effectively solved by using MgO-pre-coating support and MgO-post-coating confined metal-NPs strategy.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Abdulaziz Bagabas, Ahmed Sadeq Al-Fatesh, Samsudeen Olajide Kasim, Rasheed Arasheed, Ahmed Aidid Ibrahim, Rawan Ashamari, Khalid Anojaidi, Anis Hamza Fakeeha, Jehad K. Abu-Dahrieh, Ahmed Elhag Abasaeed
Summary: A new nickel-based catalyst with MgO promoter showed efficient performance in the dry reforming of methane process, achieving high conversion rates and low carbon deposition. The study highlights the importance of catalyst composition in improving the DRM process efficiency and sustainability.
Article
Chemistry, Multidisciplinary
Beom-Jun Kim, Ho-Ryong Park, Yeol-Lim Lee, Seon-Yong Ahn, Kyoung-Jin Kim, Ga-Ram Hong, Hyun-Seog Roh
Summary: Ni-MgO-ZrO2 catalysts with different MgO content were prepared and evaluated for the dry reforming reaction utilizing coke oven gas (COG). The addition of MgO promoted the formation of NiO-MgO solid solution, increasing the dispersion of Ni0 but decreasing the reduction degree due to strong metal-support interactions. The basicity of the catalyst was also affected by the incorporation of Mg2+ ions into the tetragonal-ZrO2 lattice. Through systematic optimization, the Ni-30MgO-ZrO2 catalyst showed the highest catalytic activity and stability in the COG-DRM reaction.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Chemistry, Applied
Bin Li, Ting Li, Yong-Shan Xiao, Zhong-Wen Liu
Summary: Ni-7Pr6O11-SiO2, Ni-7Nd2O3-SiO2, and Ni-7Sm2O3-SiO2 are rare earth metal oxide promoted Ni-SiO2 catalysts with 7 wt% loading. These catalysts demonstrate high activity for pressurized carbon dioxide reforming of methane (CRM) and exhibit improved stability with suppressed formation of carbon nanotubes on the catalyst surface. The addition of Sm2O3 enhances the oxidization of carbon species and maintains a well-balanced coke forming and removing rate over Ni-7Sm2O3-SiO2. These findings contribute to a better understanding of the promotional effect of rare earth metal oxides on Ni-based catalysts for CRM.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Physical
F. Barzegari, M. Rezaei, M. Kazemeini, F. Farhadi, A. Keshavarz
Summary: The study prepared 15 wt. % La2O3-promoted NiO-MgO-SiO2 catalysts for syngas production via propane steam reforming. Characterization techniques revealed that the addition of La2O3 enhanced metal-support interaction and increased strong basic sites. Despite improved metal dispersion, the promoted catalysts showed lower propane conversion and hydrogen yield due to decreased acidic sites.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Physical
Ruifan Tan, Ping Wang, Luyao Guo, Zupeng Chen, Ronghe Lin, Xiaoling Mou, Yunjie Ding
Summary: The shape of the carriers plays a significant role in the catalytic performance of metal-supported catalysts. This study investigates the impact of different shapes of ZrO2 (nanorods-like, spherical, and irregular nanoparticles) on the catalytic performance in methane dry reforming by dispersing Ni species. Various characterization techniques are used to analyze the fresh and spent catalysts. The reducibility of NiO species is found to follow the order of Ni/RZ.
Article
Energy & Fuels
Yanli Huang, Xiaodong Li, Qian Zhang, Vladimir A. Vinokurov, Wei Huang
Summary: The study revealed that the stability of catalyst declines rapidly at elevated reaction pressure, with differences in the sources and types of carbon deposition between atmospheric pressure and pressurized conditions. Carbon nanotubes were produced by CH4 decomposition reaction and CO disproportionation reaction at atmospheric pressure, while at high pressure, filamentous carbon was formed regardless of the reaction temperature, and accompanied by encapsulated graphitic carbon.
Review
Chemistry, Physical
Junqiang Xu, Pan Xia, Qiang Zhang, Fang Guo, Yong Xia, Huan Tian
Summary: This study focuses on the impact of cold plasma treatment on the coke resistance of Ni-based catalysts in the CRM reaction, specifically on changes in structure, the correlation between treatment conditions and resistance, and the mechanism for improving resistance. This research is significant for the development of more efficient catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Applied
Huy Nguyen-Phu, Taehyup Kim, Youngchan Kim, Ki Hyuk Kang, Hyungtae Cho, Junghwan Kim, Insoo Ro
Summary: We developed a synthesis route for highly active and stable nickel-based catalysts for dry methane reforming by manipulating the Mg/Al ratio. The presence of both spinel and periclase phases in the catalysts at a Mg/Al ratio of 1.5 (Ni-Mg1.5AlOx) resulted in the highest activity and stability. This work highlights the influence of catalyst phase on key factors determining activity and stability.
Article
Chemistry, Physical
Lei He, Mingrun Li, Wen-Cui Li, Wei Xu, Yang Wang, Yan-Bo Wang, Wenjie Shen, An-Hui Lu
Summary: This study presents a unique catalyst configuration where Ni particles are confined by a MEO layer, enabling stable operation at high temperatures and prolonging catalyst lifetime with nearly coke-free operation. The high-entropy design and stabilization effect of this catalyst offer a facile strategy for fabricating active and robust metal catalysts for challenging reactions over a wide range of temperatures.
Article
Engineering, Chemical
Ying Wang, Bin Li, Yong-Shan Xiao, Zhong-Wen Liu
Summary: The complex-decomposition method was used to regulate the chemical and structural properties of NiO-MgO catalysts. The Ni0.1Mg0.9O catalyst prepared using glycine as the complexing agent and calcined at 800 degrees C exhibited the best catalytic performance.
Article
Energy & Fuels
Yu Fu, Wenbo Kong, Bingrong Pan, Changkun Yuan, Shuqing Li, He Zhu, Jun Zhang
Summary: In this study, the dry reforming of methane was investigated using catalysts modified by different amounts of B2O3. The results showed that the introduction of a small amount of B2O3 significantly improved the catalyst's activity, stability, and carbon resistance.
JOURNAL OF THE ENERGY INSTITUTE
(2022)
Article
Chemistry, Applied
Hongliang Sun, Shaozeng Sun, Dongdong Feng, Yijun Zhao, Yu Zhang, Linyao Zhang, Jiangquan Wu, Yukun Qin
Summary: The formation of coke deposition is a major obstacle in the development of tar reforming and biomass thermal conversion. Biochar produced at 800 degrees C was used for catalytic reforming of biomass pyrolysis tar at 650 degrees C, leading to increased coke yield and decreased tar removal efficiency with extended feeding time. Biochar is more efficient in removing aliphatic components from tar than aromatic components, and catalytic reforming of tar leads to increased aromatization. Additionally, the addition of biochar has minimal impact on CO and CO2 yield but affects CH4 and H2 yield.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
Yun-Jeong Gu, Ju-Hwan Kim, Won-Jun Jang, Dae-Woon Jeong
Summary: CeO2 supports were synthesized using different methods and nano-sized CeO2 supports were prepared through pre-calcination. Among the prepared catalysts, Cu/CeO2-CHC showed the highest CO conversion due to its highest Cu dispersion and oxygen storage capacity.
Article
Chemistry, Physical
Yeol-Lim Lee, Hyo-Young Kim, Kyoung-Jin Kim, Ga-Ram Hong, Jae -Oh Shim, Young-Wan Ju, Hyun-Seog Roh
Summary: Waste-to-hydrogen processes utilize the gasification of waste to produce hydrogen while reducing landfill/incineration. A nanofiber-structured CoFe(2)O(4) catalyst synthesized by electrospinning method showed superior redox property and exhibited the best catalytic activity in the water-gas shift reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Engineering, Environmental
Yeol-Lim Lee, Kyubock Lee, Chang Hyun Ko, Hyun-Seog Roh
Summary: Climate change has led to a greater focus on hydrogen as a cleaner and more efficient energy source. However, hydrogen production mainly relies on fossil fuels, calling for the development of smallscale production processes like compact reformers. These reformers require customized catalysts for their core unit processes, and their development is essential for efficient and scalable hydrogen production.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Yeol-Lim Lee, Dongjun Lim, Boreum Lee, Mukesh Upadhyay, Boris Brigljevic, Hyun-Seog Roh, Hankwon Lim
Summary: The economic viability of methanol production from landfill gas using a newly developed nickel-based catalyst was assessed. The new process showed higher efficiency and lower production costs compared to the base process.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Energy & Fuels
Kyung-Won Jeon, Ho-Ryong Park, Yeol-Lim Lee, Jee-Eun Kim, Won-Jun Jang, Jae-Oh Shim, Hyun-Seog Roh
Summary: In this study, a Ni/MgO-Al2O3 catalyst was developed for the production of green diesel from non-edible fatty acids. Among the prepared catalysts, the 20% Ni/MG70 catalyst exhibited the best deoxygenation performance due to its higher number of Ni active sites, easier reducibility, and appropriate acidity.
Article
Chemistry, Multidisciplinary
Yeol-Lim Lee, Beom-Jun Kim, Ho-Ryong Park, Seon-Yong Ahn, Kyoung-Jin Kim, Hyun-Seog Roh
Summary: This study investigates the effect of heat-treatment conditions on the physicochemical properties of the support and catalyst, and reveals the important relationship between the oxygen storage capacity of the support and the catalytic activity of the catalyst.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Chemistry, Multidisciplinary
Beom-Jun Kim, Jeong-Cheol Seo, Dong-Hyun Kim, Yeol-Lim Lee, Kyubock Lee, Hyun-Seog Roh
Summary: Ni-CeO2-MgO-Al2O3 catalysts with bimodal meso-macropores were synthesized using one-pot spray pyrolysis with dextrin as a structuring agent. These catalysts showed improved catalytic activity and stability in dry reforming of methane compared to dense catalysts. The formation of macropores from phase segregation and dextrin decomposition affected the physical and chemical features of the catalysts.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Engineering, Environmental
Faisal Zafar, Rong Zhao, Mansoor Ali, Yong Min Park, Hyun-Seog Roh, Xinhua Gao, Jumei Tian, Jong Wook Bae
Summary: The synergy effects of In2O3 promoter on ordered mesoporous Cu/Al2O3 structures in CO2 hydrogenation to oxygenates were investigated in this study. It was found that the smaller In2O3 particles interacted contiguously with Cu-Al2O3 matrices, enhancing CO2 activation and stabilizing Cu nanoparticles. The optimized InCu/mAl(1) ratio of 0.01 showed the highest catalytic activity, with accelerated CO2 dissociation and formation of formate intermediates. However, excessive In2O3 hindered the catalytic activity and increased the selectivity of oxygenates.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Kyoung-Jin Kim, Kyung-Won Jeon, Ga-Ram Hong, Byong-Hun Jeon, Jong Wook Bae, Yeol-Lim Lee, Hyun-Seog Roh
Summary: This study systematically investigated the effect of CeO2/ZrO2 ratio on the sulfur-tolerance of high temperature shift catalysts using waste derived synthesis gas. The results showed that the oxygen storage capacity of the catalysts plays a crucial role in determining the sulfur tolerance, and is related to the regeneration rate and Pt dispersion.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Review
Chemistry, Physical
Seon-Yong Ahn, Won-Jun Jang, Jae-Oh Shim, Byong-Hun Jeon, Hyun-Seog Roh
Summary: Reducing carbon dioxide emissions is a major global challenge in energy and environmental fields. Catalysis plays a crucial role in addressing this challenge by developing new technologies and improving conventional ones. The review focuses on the extended applications of oxygen storage materials in high-value-added chemicals and their use in carbon-neutral automotive catalysis. The study emphasizes the physico-chemical properties that are closely related to oxygen storage capacity.
CATALYSIS REVIEWS-SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Environmental
Kyung-Won Jeon, Jin Koo Kim, Beom-Jun Kim, Won-Jun Jang, Yun Chan Kang, Hyun-Seog Roh
Summary: The study demonstrates that Ni/Al2O3 yolk-shell catalysts have high resistance against alkali poisoning and exhibit excellent carbon deposition resistance. Among them, the Ni/pys-Al2O3 catalyst shows the highest methane conversion and the best stability at a high gas hourly space velocity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Seon-Yong Ahn, Kyoung-Jin Kim, Beom-Jun Kim, Jae-Oh Shim, Won-Jun Jang, Hyun-Seog Roh
Summary: This study investigated the active sites and structure-sensitivity of Cu-ZnO-Al2O3 (CZA) catalysts in the water-gas shift (WGS) reaction. CZA catalysts with different Cu contents were synthesized using a homogeneous one-step coprecipitation method. The Cu content affected the number of active Cu sites and had a close relationship with WGS activity. Turnover frequency (TOF) values were independent of Cu dispersion, suggesting that the CZA catalyst is structure-insensitive in WGS. The ratio of surface Cu+ species also strongly influenced the activity of the CZA catalyst. TOF based on the total active Cu species remained constant, but CO conversion increased linearly with the number of surface Cu+ species.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Review
Chemistry, Physical
Ru-Ri Lee, I-Jeong Jeon, Won-Jun Jang, Hyun-Seog Roh, Jae-Oh Shim
Summary: Hydrogen is primarily produced from fossil fuels through steam reforming, but alternative methods using waste as a resource are gaining attention. The water-gas shift reaction is crucial for hydrogen production from waste, but a suitable catalyst is needed due to the higher CO concentration in waste-derived syngas. This study reviews the development of catalysts for waste-derived hydrogen production and provides essential knowledge for catalyst design.
Article
Engineering, Environmental
Marwa M. El-Dalatony, Bikram Basak, Mayur B. Kurade, Hyun-Seog Roh, Min Jang, Byong-Hun Jeon
Summary: This study demonstrates the effective production of biohydrogen (bioH(2)) and ABE through ABE fermentation using sonication pretreated Chlamydomonas mexicana biomass as a cost-effective substrate. Sonication enhances the recovery and bioaccessibility of carbohydrates and proteins, resulting in higher yields of bioH(2) and volatile fatty acids. The study shows the efficient conversion of soluble carbohydrates and proteins into bioH(2) and ABE, which can be used for high-energy biofuel production with minimal waste generation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Cameron Bracken, Nathalie Voisin, Casey D. Burleyson, Allison M. Campbell, Z. Jason Hou, Daniel Broman
Summary: This study presents a methodology and dataset for examining compound wind and solar energy droughts, as well as the first standardized benchmark of energy droughts across the Continental United States (CONUS) for a 2020 infrastructure. The results show that compound wind and solar droughts have distinct spatial and temporal patterns across the CONUS, and the characteristics of energy droughts are regional. The study also finds that compound high load events occur more often during compound wind and solar droughts than expected.
Article
Green & Sustainable Science & Technology
Ning Zhang, Yanghao Yu, Jiawei Wu, Ershun Du, Shuming Zhang, Jinyu Xiao
Summary: This paper provides insights into the optimal configuration of CSP plants with different penetrations of wind power by proposing an unconstrained optimization model. The results suggest that large solar multiples and TES are preferred in order to maximize profit, especially when combined with high penetrations of wind and photovoltaic plants. Additionally, the study demonstrates the economy and feasibility of installing electric heaters (EH) in CSP plants, which show a linear correlation with the penetration of variable energy resources.
Article
Green & Sustainable Science & Technology
M. Szubel, K. Papis-Fraczek, S. Podlasek
Article
Green & Sustainable Science & Technology
J. Silva, J. C. Goncalves, C. Rocha, J. Vilaca, L. M. Madeira
Summary: This study investigated the methanation of CO2 in biogas and compared two different methanation reactors. The results showed that the cooled reactor without CO2 separation achieved a CO2 conversion rate of 91.8%, while the adiabatic reactors achieved conversion rates of 59.6% and 67.2%, resulting in an overall conversion rate of 93.0%. Economic analysis revealed negative net present worth values, indicating the need for government monetary incentives.
Article
Green & Sustainable Science & Technology
Yang Liu, Yonglan Xi, Xiaomei Ye, Yingpeng Zhang, Chengcheng Wang, Zhaoyan Jia, Chunhui Cao, Ting Han, Jing Du, Xiangping Kong, Zhongbing Chen
Summary: This study investigated the effect of using nanofiber membrane composites containing Prussian blue-like compound nanoparticles (PNPs) to relieve ammonia nitrogen inhibition of rural organic household waste during high-solid anaerobic digestion and increase methane production. The results showed that adding NMCs with 15% PNPs can lower the concentrations of volatile fatty acids and ammonia nitrogen, and increase methane yield.
Article
Green & Sustainable Science & Technology
Zhong Ge, Xiaodong Wang, Jian Li, Jian Xu, Jianbin Xie, Zhiyong Xie, Ruiqu Ma
Summary: This study evaluates the thermodynamic, exergy, and economic performance of a double-stage organic flash cycle (DOFC) using ten eco-friendly hydrofluoroolefins. The influences of key parameters on performance are analyzed, and the advantages of DOFC over single-stage type are quantified.
Article
Green & Sustainable Science & Technology
Nicolas Kirchner-Bossi, Fernando Porte-Agel
Summary: This study investigates the optimization of power density in wind farms and its sensitivity to the available area size. A novel genetic algorithm (PDGA) is introduced to optimize power density and turbine layout. The results show that the PDGA-driven solutions significantly reduce the levelized cost of energy (LCOE) compared to the default layout, and exhibit a convex relationship between area and LCOE or power density.
Article
Green & Sustainable Science & Technology
Chunxiao Zhang, Dongdong Li, Lin Wang, Qingpo Yang, Yutao Guo, Wei Zhang, Chao Shen, Jihong Pu
Summary: In this study, a novel reversible liquid-filled energy-saving window that effectively regulates indoor solar radiation heat gain is proposed. Experimental results show that this window can effectively reduce indoor temperature during both summer and winter seasons, while having minimal impact on indoor illuminance.
Article
Green & Sustainable Science & Technology
Alessandro L. Aguiar, Martinho Marta-Almeida, Mauro Cirano, Janini Pereira, Leticia Cotrim da Cunha
Summary: This study analyzed the Brazilian Equatorial Shelf using a high-resolution ocean model and found significant tidal variations in the area. Several hypothetical barrages were proposed with higher annual power generation than existing barrages. The study also evaluated the installation effort of these barrages.
Article
Green & Sustainable Science & Technology
Francesco Superchi, Nathan Giovannini, Antonis Moustakis, George Pechlivanoglou, Alessandro Bianchini
Summary: This study focuses on the optimization of a hybrid power station on the Tilos island in Greece, aiming to increase energy export and revenue by optimizing energy fluxes. Different scenarios are proposed to examine the impact of different agreements with the grid operator on the optimal solution.
Article
Green & Sustainable Science & Technology
Peimaneh Shirazi, Amirmohammad Behzadi, Pouria Ahmadi, Sasan Sadrizadeh
Summary: This research presents two novel energy production/storage/usage systems to reduce energy consumption and environmental effects in buildings. A biomass-fired model and a solar-driven system integrated with photovoltaic thermal (PVT) panels and a heat pump were designed and assessed. The results indicate that the solar-based system has an acceptable energy cost and the PVT-based system with a heat pump is environmentally superior. The biomass-fired system shows excellent efficiency.
Article
Green & Sustainable Science & Technology
Zihao Qi, Yingling Cai, Yunxiang Cui
Summary: This study aims to investigate the operational characteristics of the solar-ground source heat pump system (SGSHPS) in Shanghai under different operation modes. It concludes that tandem operation mode 1 is the optimal mode for winter operation in terms of energy efficiency.
Article
Green & Sustainable Science & Technology
L. Bartolucci, S. Cordiner, A. Di Carlo, A. Gallifuoco, P. Mele, V. Mulone
Summary: Spent coffee grounds are a valuable biogenic waste that can be used as a source of biofuels and valuable chemicals through pyrolysis and solvent extraction processes. The study found that heavy organic bio-oil derived from coffee grounds can be used as a carbon-rich biofuel, while solvent extraction can extract xantines and p-benzoquinone, which are important chemicals for various industries. The results highlight the promising potential of solvent extraction in improving the economic viability of coffee grounds pyrolysis-based biorefineries.
Article
Green & Sustainable Science & Technology
Luiza de Queiroz Correa, Diego Bagnis, Pedro Rabelo Melo Franco, Esly Ferreira da Costa Junior, Andrea Oliveira Souza da Costa
Summary: Building-integrated photovoltaics, especially organic solar technology, are important for reducing greenhouse gas emissions in the building sector. This study analyzed the performance of organic panels laminated in glass in a vertical installation in Latin America. Results showed that glass lamination and vertical orientation preserved the panels' performance and led to higher energy generation in winter.
Article
Green & Sustainable Science & Technology
Zhipei Hu, Shuo Jiang, Zhigao Sun, Jun Li
Summary: This study proposes innovative fin arrangements to enhance the thermal performance of latent heat storage units. Through optimization of fin distribution and prediction of transient melting behaviors, it is found that fin structures significantly influence heat transfer characteristics and melting behaviors.
