Article
Chemistry, Physical
Peixuan Hao, Yixiang Shi, Ningsheng Cai
Summary: LaNi5 based alloys have been proposed for hydrogen separation and purification, but limited by poor CO tolerance at atmospheric temperature. A new method, ET-VPSA, using LaNi4.3Al0.7 as adsorbent, has been proposed to be energy efficient by elevating working temperature. The study shows that ET-VPSA can achieve a higher H-2 recovery rate compared to regular PSA, leading to a higher net efficiency in the hydrogen purification process.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Jian Wang, Xu Chen, Tao Du, Liying Liu, Paul A. Webley, Gang Kevin Li
Summary: In this study, it was demonstrated experimentally that a VPSA rig filled with activated carbon RB3 can achieve hydrogen production with a purity of 99.67% and a recovery of 91.97% at a low feed pressure of 5.17 bar. By optimizing the parameters, a hydrogen product with a purity of 99.995% and a recovery of 92.29% was obtained at slightly increased adsorption pressure and vacuum pressure. The success of low-pressure hydrogen production from coke oven gas (COG) will greatly accelerate COG utilization transformation and the decarbonization of the iron and steel industry.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Daniel B. Boman, Srinivas Garimella
Summary: A study found that in the desorption stage of a temperature-swing adsorption process, the liquid-phase heat transfer fluid outperforms the gas-phase heat transfer fluid by not only more thoroughly removing impurities, but also retaining more initial methane.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Chemical
Hua Shang, Honghao Bai, Xiaomin Li, Jinping Li, Jiangfeng Yang
Summary: A highly integrated mobile skid-mounted VPSA system was designed and installed, and low-concentration CH4 capture trials were carried out in a coal mine in China. The results showed that the CH4 content in the product gas met the requirements of 4T grade city gas in China after purification.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Review
Chemistry, Physical
Andrey Lider, Viktor Kudiiarov, Nikita Kurdyumov, Jinzhe Lyu, Maxim Koptsev, Nahum Travitzky, Dachamir Hotza
Summary: Hydrogen is a high-quality, clean energy carrier and essential for solving the climate problem. The production of high-purity hydrogen is crucial for new chemical processes and high-efficiency fuel cells. Membrane technology shows promise for hydrogen purification and separation due to its scalability and high degree of purification.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Marian Flores-Granobles, Mark Saeys
Summary: The study develops a pressure-swing reverse water gas shift (PS-RWGS) chemical looping process to recover CO from blast furnace gas, reducing conventional CO emissions.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Mathematics
Gerardo Ortiz Torres, Jesse Yoe Rumbo Morales, Moises Ramos Martinez, Jorge Salvador Valdez-Martinez, Manuela Calixto-Rodriguez, Estela Sarmiento-Bustos, Carlos Alberto Torres Cantero, Hector Miguel Buenabad-Arias
Summary: This article proposes a pressure swing adsorption (PSA) process for producing high-purity bio-hydrogen. The process utilizes two columns packed with type 5A zeolite and a four-step configuration for hydrogen production and bed regeneration. An active fault-tolerant control (FTC) controller is designed and used to maintain a stable purity of 0.9999 (99.99%) in molar fraction, even with actuator faults.
Article
Engineering, Chemical
Yuan Sun, Chuanzhao Zhang, Xianqiang Zhu, Liang Dong, Xianhang Sun
Summary: Rapid-cycle pressure swing adsorption (PSA) with small adsorbents particles is used to improve mass transfer rate and productivity. A heat and mass transfer model of this process is developed and validated to analyze the effects of mass transfer resistances on the cyclic adsorption process. The results show that the dominant mass transfer resistance of small adsorbent particles is a combination of film resistance, axial dispersion effect, and macropore diffusion resistance.
Article
Engineering, Chemical
Chien-Shun Chang, Sheng-Hao Ni, Hong-Sung Yang, Cheng-Tung Chou
Summary: This study compared the performance of semicylindrical adsorbers with traditional cylindrical adsorbers for pressure swing adsorption using zeolite 5A to separate oxygen from air. The results showed that semicylindrical adsorbers with better heat compensation can increase oxygen purity, especially in Skarstrom cycle operation. The benefit of heat compensation is more pronounced for larger adsorbers, higher temperatures, and lower feed pressures within the scope of this study.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Multidisciplinary
Satoshi Ogawa, Sayaka Tamura, Hisanori Yamane, Toyokazu Tanabe, Miwa Saito, Teruki Motohashi
Summary: Researchers have discovered a new iron-based oxide, Ba5CaFe4O12, which exhibits remarkable properties as a low-temperature driven oxygen storage material. This material surpasses the performance of previously reported materials and holds great potential for cost reduction and energy efficiency improvement in chemical looping air separation.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Environmental
Guoping Hu, Qinghu Zhao, Mitch Manning, Li Chen, Lanjin Yu, Eric F. May, Kevin Gang Li
Summary: The study demonstrates the feasibility of separating methane from low concentration sources using the PVSA method, achieving high purity CH4 product gas with reduced energy consumption.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Omid T. Qazvini, Victoria-Jayne Scott, Linda Bondorf, Maxime Ducamp, Michael Hirscher, Franccommaois-Xavier Coudert, Shane G. Telfer
Summary: Flexible metal-organic frameworks like MUF-15-OMe can undergo flexing upon the uptake of specific gases, enhancing gas separation efficiency.
CHEMISTRY OF MATERIALS
(2021)
Article
Energy & Fuels
Tianqi Yang, Chao Zhan, Liang Fang, Pierre Benard, Richard Chahine, Jinsheng Xiao
Summary: This article investigates the adsorption dynamics, breakthrough behavior, and temperature profiles of hydrogen purification using activated carbon. The results show that variable heat of adsorption can effectively improve the temperature profiles and make them more consistent with experimental data.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Chemical
Guoping Hu, Gongkui Xiao, Yalou Guo, Mitch Manning, Li Chen, Lanjin Yu, Kevin Gang Li, Eric F. May
Summary: This study investigates the separation of methane and nitrogen using a new ionic liquidic zeolite material in a pressure swing adsorption process. Experimental and numerical modeling results highlight the importance of desorption pressure and feed gas flow rates in achieving efficient separation. The study also proposes a process optimization method based on bed capacity ratio.
Article
Mathematics
Mario Martinez Garcia, Jesse Y. Rumbo Morales, Gerardo Ortiz Torres, Salvador A. Rodriguez Paredes, Sebastian Vazquez Reyes, Felipe de J. Sorcia Vazquez, Alan F. Perez Vidal, Jorge S. Valdez Martinez, Ricardo Perez Zuniga, Erasmo M. Renteria Vargas
Summary: The aim of this study was to increase the purity of hydrogen to 0.99 in molar fraction using the Pressure Swing Adsorption (PSA) method. The research developed controllers based on the Hammerstein-Wiener model to maintain the desired purity even in the presence of disturbances. Both discrete PID and state feedback control were implemented and validated on a virtual plant of the PSA process, showing great performance and robustness against disturbances.
Article
Energy & Fuels
Mayurakshi Mondal, Kamal Krishna Mandal, Amitava Datta
Summary: This article presents an innovative perspective of using a gravity energy storage system around a multi-storied building to supply renewable energy. The proposed hybrid system consisting of solar PV, gravity power modules (GPMs), and vanadium redox flow battery can provide a significant amount of the building's essential load. Simulation results show that the system can meet a high percentage of the load demand while reducing the peak demand from the grid.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)